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Zero Waste Case Study: San Francisco

San Francisco Department of the Environment Jack Macy Zero Waste Senior Coordinator ( [email protected] ) (415) 355-3751

Recology Anthony Crescenti General Manager ( [email protected] ) (415) 575-2423

Partnership

Contractual agreement, disadvantages/omissions.

In 2002, San Francisco adopted a goal of 75% diversion by 2010 and a long-term goal of zero waste. It exceeded the first goal two years early, soon recovering over 80% and cutting its disposal in half. The city initiated its Environment Code in 2003 based on the Precautionary Principle . It adopted a Construction and Demolition Debris Recovery Ordinance in 2006 requiring the recovery of C&D materials.

The city's Mandatory Recycling and Composting Ordinance , passed in 2009, requires everyone in San Francisco keep recyclables, compostables and trash separated. In 2018, San Francisco updated its zero waste commitments to reducing solid waste generation 15% and disposal to landfill or incineration again 50% by 2030.

In 2018, the Commission on the Environment also adopted a resolution (pdf)  outlining the Department of the Environment's commitment to racial equity and announcing its Racial Equity Initiative. The City and County of San Francisco recognized the need for a cohesive and coordinated approach to addressing racial inequities and, in 2019, adopted an ordinance (pdf) creating an Office of Racial Equity and mandating departments develop Racial Equity Action Plans.

Blue recycling, green compost, and black trash collection bins on a San Francisco street with San Francisco skyline in the background.

San Francisco implemented an innovative three-stream citywide residential and commercial collection program , with separate bins and a full range of size and frequency options, for commingled recyclables; compostables, including all food scraps, soiled paper and plant trimmings; and any remaining trash. Outreach uses lots of images and is done in Chinese, Spanish and other languages with customer service being able to communicate in almost any language.

Zero Waste… is the highest and best use of resources--eliminating waste throughout the product lifecycle where nothing goes to landfill or high temperature destruction. We create policies and programs that prevent waste and promote recycling and composting. SF Environment is doing all we can to make zero waste a reality.

Restaurant employee pours food scraps into a large green compost bin in a commercial kitchen.

The city implemented the first and largest urban food scraps composting collection program in the U.S. serving essentially every generator. San Francisco has collected more than two million tons of material and turned it into compost used by local orchards, vineyards and farmers.

San Francisco continues to develop and implement innovative initiatives including:

  • Climate Action Goals and Planning (pdf)
  • Checkout Bag Charge and Recyclable or Compostable Pre-Checkout Bag Ordinance
  • Polystyrene Foam and the Food Service and Packaging Waste Reduction Ordinance
  • Plastic, Litter, and Toxics Reduction Law
  • Refuse Separation Law
  • Customizable Sign Maker
  • Disaster Debris Planning and Exercises

Organic compost in a large yellow front end loader bucket being driven in a vineyard with grape vines.

San Francisco actively participates in leading zero waste and climate organizations including the:

  • California Resource Recovery Association
  • Carbon Neutral Cities Alliance
  • Bay Area Deconstruction Workgroup
  • Pacific Coast Collaborative , and
  • West Coast Climate and Materials Management Forum

San Francisco has a unique long-term refuse (recyclables, compostables and trash) ordinance where the city sets rates. The ordinance created a permit system to collect refuse for a charge and over time Recology acquired all the permits. The service provider develops infrastructure and provides collection, processing and reporting. The city provides direction and oversight. Most outreach is coordinated. To ensure success, San Francisco and Recology managers maintain regular communication and meet often to review operations, tasks and performance, and resolve any outstanding issues. A permit is not required to collect refuse with commercial value. Construction and demolition materials are not refuse and are governed by that ordinance.

  • Strong Leadership: Strong political leadership and staff expertise have resulted in innovative policy, programs and incentives with extensive outreach in all sectors.
  • Continuity and Rate Setting Support Collaboration and Adaptability: Periodic rate applications fund infrastructure, operations and programs with evolving pay-as-you-throw rate structures and additional funding mechanisms between processes. This allows the city and service provider to work more collaboratively on programmatic development. Not conducting procurement processes or managing contracts facilitates long-term planning and adaptability. Overseeing essentially one primary service provider simplifies administration, communications, information gathering and reporting.
  • Rewards Generators and Service Provider for Reducing Waste: Businesses and residences are incentivized to reduce generation, and recycle and compost, and Recology is incentivized to reduce disposal.
  • Dependent on Ratemaking Process: The ratemaking process is very complex, time consuming and resource intensive.
  • Limited Competition: The refuse ordinance restricts competition on refuse without commercial value but has delivered efficient, leading zero waste programs.
  • Managing Waste Streams
  • How to Use the Tool
  • Terms & Definitions
  • Filter Descriptions and Qualitative Rankings
  • Map of Featured Cities and Counties
  • The Planning Tool
  • Browse by Topic
  • Examples and Resources (#1-50)
  • Examples and Resources (#51-100)
  • Berkeley, CA
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  • Full Contracts and Agreements
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Sustainable Waste Management In Indore: A Case Study

Indore, a fast-growing city in India, has emerged as a model for sustainable waste management practices. Over the past few years, Indore has consistently ranked as the cleanest city in India, thanks to the efficient waste management system put in place by the municipal corporation. 

This case study explores the background, challenges faced, solutions implemented, and key learnings from Indore’s successful waste management system.

Indore, with a population of over 3.2 million people, generates around 1,100 metric tons of waste daily. Prior to 2016, the city struggled with waste management, leading to unhygienic conditions, increased pollution, and negative impacts on public health. 

However, the launch of the Swachh Bharat (Clean India) campaign in 2014 led the Indore Municipal Corporation (IMC) to undertake a comprehensive transformation of its waste management system. This involved an overhaul of existing infrastructure, policies, and community engagement initiatives to create a more efficient and environmentally friendly waste management system.

Challenges faced:

Lack of waste segregation at the source:  

Indore faced issues with mixed waste, which hindered the recycling and disposal process. Unsegregated waste resulted in inefficient waste collection and processing, causing further strain on the waste management system.

Inefficient waste collection and transportation system: 

With limited resources and vehicles, the city’s waste collection and transportation system could not keep up with the growing population and waste generation.

Open dumping and burning of waste: The absence of adequate waste processing facilities led to the practice of open dumping and burning of waste, which contributed to air and land pollution.

Inadequate public awareness and participation: 

Citizens were not fully aware of the importance of waste segregation, recycling, and proper disposal, resulting in low participation rates and disregard for waste management rules.

Limited infrastructure for waste processing and disposal: 

The city’s waste processing and disposal infrastructure was unable to cope with the increasing waste generation, leading to unmanaged landfills and environmental degradation.

Solutions implemented:

Segregation at the source: 

The IMC implemented a mandatory waste segregation policy, requiring households to separate waste into wet (biodegradable) and dry (recyclable) categories. This allowed for more efficient waste collection and processing, as well as increased recycling rates.

Door-to-door waste collection: 

A fleet of over 600 GPS-enabled vehicles were deployed to collect segregated waste daily from all households and commercial establishments. This ensured timely and efficient waste collection, preventing littering and illegal dumping.

Waste processing and disposal: The city established a state-of-the-art waste processing facility capable of handling 1,000 metric tons of waste daily, including a 15 MW waste-to-energy plant and a 200 TPD (tons per day) composting plant. These facilities enabled the city to process and dispose of waste more effectively, reducing the environmental impact of waste disposal.

Public awareness and participation: 

The IMC launched numerous awareness campaigns, involving local celebrities, schools, and religious institutions, to educate the public on the importance of waste segregation and cleanliness. This resulted in increased community involvement and support for the waste management program.

Strict monitoring and enforcement: 

Regular inspections, fines, and incentives were introduced to ensure compliance with waste management rules. This helped maintain the cleanliness of the city and encouraged citizens to adhere to waste segregation and disposal guidelines.

Results achieved:

Waste segregation: 

Over 90% of households in Indore now segregate their waste, significantly improving the efficiency of waste collection and processing, and reducing the burden on landfills.

Waste processing: 

The city’s waste processing facility successfully manages 1,000 metric tons of waste daily, with a 95% waste recovery rate. This has led to a substantial reduction in landfill usage and has minimized the environmental impact of waste disposal.

Cleanliness: 

Indore has consistently ranked as the cleanest city in India in the annual Swachh Survekshan survey since 2017. This highlights the success of the city’s waste management system and the active participation of its residents in maintaining cleanliness.

Health and environment: 

Cases of vector-borne diseases have dropped by 60% since the implementation of the waste management system, and air quality has improved due to reduced open burning of waste. This has led to a healthier environment and improved overall quality of life for Indore’s residents.

Key learnings:

Political will and administrative commitment are crucial for the successful implementation of waste management systems. Indore’s transformation was made possible by strong leadership and a dedicated municipal corporation committed to addressing the city’s waste management challenges.

Public awareness and participation play a significant role in ensuring the success of waste management initiatives. By actively involving the community and raising awareness about the importance of waste segregation and proper disposal, Indore was able to achieve a high level of public participation and support.

Strict monitoring and enforcement mechanisms help ensure compliance with waste management rules and regulations. Indore’s approach to enforcing waste segregation and disposal guidelines, combined with regular inspections and penalties, proved to be effective in maintaining the city’s cleanliness.

Investing in modern waste processing infrastructure can significantly improve the efficiency of waste management systems and reduce environmental impact. Indore’s investment in a state-of-the-art waste processing facility allowed the city to process and dispose of waste more effectively, leading to a substantial reduction in landfill usage and associated environmental issues.

Indore’s transformation into a clean, sustainable city serves as an inspiring example for other urban centers in India and around the world. 

By adopting a comprehensive, integrated approach to waste management, Indore has successfully addressed its waste management challenges and set a benchmark for sustainable urban living. 

The city’s experience provides valuable insights and lessons for other municipalities looking to improve their waste management systems and promote environmental sustainability.

Decentralised Urban Waste Management: A Case Study of Solid Waste Management in Two Indian Cities - Thiruvananthapuram and Bengaluru

  • First Online: 12 January 2022

Cite this chapter

case study on waste management

  • Namitha Madhukumar 3  

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India generates 62 million tons of waste every year, of which 60% gets collected and only 15% processed. With the huge spike in urban population and shrinking spaces, it is imperative for an efficient waste management system. Unscientific waste disposal augments the emission of Greenhouse Gases like methane (6% in India). Waste to Energy plant is not viable in India due to the high concentration of organic content and inadequate segregation. Under such a situation, a Centralised treatment facility will not only culminate in irrevocable environmental and health hazards but further aggravate prevailing socio-political injustice in the country. The best possible alternative to this systemic hurdle is Decentralised Waste Management. This paper looks at two urban cities, Thiruvananthapuram and Bengaluru, where the former follows a decentralised waste management system and the latter centralised. The Waste Management system in Thiruvananthapuram city champions concepts of circular economy adopted by developed countries, which contest the unsustainable linear model. The city’s strategies adopted under Decentralised Waste Management are a catalyst towards achieving ‘ no burn city ’, an initiative against incineration and greenhouse gas emissions. The case studies of Bengaluru and Thiruvananthapuram city highlight the impact of systemic changes through progressive interventions towards the eradication of structural disparities. It analyses different aspects, the labour, the public, the governance and the environment in the context of waste management. The paper delves further into the question of welfare and beneficiary from state’s point of view. Through the system of Decentralised Waste Management, the paper advocates the importance of devolution of power and dissolution of responsibilities for a sustainable environment and an empowered and equitable society.

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Madhukumar, N. (2022). Decentralised Urban Waste Management: A Case Study of Solid Waste Management in Two Indian Cities - Thiruvananthapuram and Bengaluru. In: Chaiechi, T., Wood, J. (eds) Community Empowerment, Sustainable Cities, and Transformative Economies. Springer, Singapore. https://doi.org/10.1007/978-981-16-5260-8_14

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  • Published: 05 January 2022

Household solid waste management practices and perceptions among residents in the East Coast of Malaysia

  • Widad Fadhullah   ORCID: orcid.org/0000-0003-4652-0661 1 , 2 ,
  • Nor Iffah Najwa Imran 1 ,
  • Sharifah Norkhadijah Syed Ismail 3 ,
  • Mohd Hafiidz Jaafar 2 &
  • Hasmah Abdullah 1 , 4  

BMC Public Health volume  22 , Article number:  1 ( 2022 ) Cite this article

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Poor waste disposal practices hamper the progress towards an integrated solid waste management in households. Knowledge of current practices and perception of household solid waste management is necessary for accurate decision making in the move towards a more sustainable approach. This study investigates the household waste practices and perceptions about waste management in Panji, one of the sub-districts in Kota Bharu, Kelantan, Malaysia.

A stratified random sampling technique using a cross-sectional survey questionnaire was used to collect data. A total of 338 households were interviewed in the survey and data were analyzed using SPSS. Chi-square goodness of fit test was used to determine the relationships between categorical variables, whereas Chi-square bivariate correlation test was performed to observe the correlation between the perceptions of waste segregation with socio-demographic background of the respondents. The correlation between perception of respondents with the locality, house type and waste type were also conducted. Principal component analysis was used to identify grouping of variables and to establish which factors were interrelated in any given construct.

The results of the study revealed that 74.3 % of households disposed of food debris as waste and 18.3% disposed of plastic materials as waste. The study also showed that 50.3% of the households segregate their waste while 49.7% did not. About 95.9% of the respondents were aware that improper waste management leads to disease; such as diarrhea and malaria. There were associations between locality, age and house type with waste segregation practices among respondents (Chi-square test, p<0.05). Associations were also found between locality with the perception of improper waste management which lead to disease (Chi-square test, p<0.05). Principal Component Analysis showed that 17.94% of the variance has high positive loading (positive relationship) with age, marital status and, type of house.

This study highlights the importance to design waste separation programs that suit the needs of targeted population as a boost towards sustainable solid waste management practices.

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Solid waste management (SWM) in the majority of developing countries including Malaysia is dominated by open dumping due to lower capital, operational and maintenance cost in comparison with another disposal method [ 47 ]. This non-sanitary and non-engineered approach are without appropriate liners, gas collection and leachate collection and treatment, thereby exposing the surrounding environment with multiple air, water and soil pollution issues [ 15 , 23 ]. The effects of the ineffective management of household solid waste on public health (Fig. 1 ) can be separated into physical, biological, non-communicable diseases, psychosocial and ergonomics health risks [ 6 , 51 , 77 ]. Contaminated soil, air and water provide breeding ground to biological vectors such as flies, rodents and insects pests. Many diseases are sequentially caused by these biological vectors, such as diarrhoea, dysentery, gastrointestinal problems, worm infection, food poisoning, dengue fever, cholera, leptospirosis and bacterial infection; irritation of the skin, nose and eyes; as well as respiratory symptoms [ 25 , 41 , 42 , 52 ]. Exposure to gases generated by landfill waste such as methane, carbon dioxide, sulphur dioxide and nitrogen dioxide can produce inflammation and bronchoconstriction and can affect the immune cell. Hydrogen chloride and hydrogen fluoride released from the waste if deposited in the respiratory system, may cause cough, chest tightness and breathlessness [ 21 ].

figure 1

Effect of ineffective household solid waste management on public health

Another category of health effects that can be closely related to household solid waste management is non-communicable diseases. Some studies estimated that the pollutions from the dumpsite might cause cancers (e.g. liver, pancreas, kidney, larynx) and non-Hodgkin lymphoma [ 8 , 31 , 51 ]. Other health effects under this category worth mentioning are birth defects, preterm babies, congenital disorders and Down’s syndrome [ 51 , 52 ]. Apart from physical and biological effects, inefficient household waste management can lead to psychosocial effects such as disturbing odour, unsightly waste, and thinking, cognitive and stress-related problems [ 6 , 51 , 52 , 74 , 77 ]. Ergonomics is the final category of related health effects that is worth mentioning specifically for the working community of household waste management (Fig. 1 ). The risk of ergonomic issues is related to body posture, repetitive movement and excessive force movement [ 6 ].

Majority of the solid waste generated in Malaysia composed of organic waste with high moisture content [ 43 ], hence, the handling and waste separation at source is the most critical step in waste management [ 62 ]. The increasing amount of waste generated annually is also intensified by lack of land for disposing waste, questioning the sustainability of the current municipal solid waste (MSW) practices of using landfills [ 46 ]. Nevertheless, the lack of success in public participation to manage the solid waste is primarily rooted by the NIMBY (not in my backyard) attitude and the public perception that solid waste is a local municipal problem is highly prevalent among Malaysians [ 3 ]. Thus, most of the existing waste segregation practices by waste-pickers are mostly done in the informal sector as means of livelihood for the poor and additional source of income. On the other hand, this practice causes serious health problems, aggravating the socio-economic situation [ 10 ].

In Kelantan, the common practice of waste disposal in rural and remote areas is by burying and burning of waste (Kamaruddin et al. 2016) while in urban or semi-urban areas, stationary waste storage containers are provided mainly at the sides of the main road. Kota Bharu Municipal Council (KBMC) is the local authority responsible in providing stationary waste storage container at collection site of waste within Kota Bharu district, collecting the solid waste approximately 3 times a week by compactor vehicles and transporting waste to the dumpsite located in Beris Lalang, Bachok [ 27 ]. However, the flaws of SWM in Kelantan lies primarily in inadequate bin and waste collection provided by local authorities, KBMC mainly constrained by financial issues (Rahim et al 2012). House to house waste collection is also hard to be implemented owing to narrow lanes and alleys which are mostly inaccessible [ 61 ] due to the development practice and geographical area in the state. Therefore, the locals’ resort to burying and burning their wastes within their house compound which has always been the practice since decades ago.

Household waste is one of the primary sources of MSW comprising of food wastes, paper, plastic, rags, metal and glasses from residential areas. Household waste is among the solid wastes managed by KBMC in Kota Bharu covering 15 sub-districts including Panji. Panji has the highest population compared to the other sub-district; therefore, assessment of household SWM among the residents is important to address their awareness and practices for planning an effective form of SWM. Some of the key factors influencing the effectiveness of SWM is by considering the size of the family, their income [ 67 ], level of education [ 19 ] and the location of household [ 1 ]. This factor is also supported by Shigeru [ 66 ] that the characteristics of households determine their recycling behavior and that sociodemographic conditions vary across municipalities. Socio-economic status and housing characteristics also affect the amount of municipal waste and how they manage it [ 20 ]. Therefore, it is crucial to understand the characteristics and needs of various households in designing a suitable waste management program.

Efficient SWM system is now a global concern which requires a sustainable SWM primarily in the developing countries. This study is another effort in gearing towards sustainable waste management practices in Malaysia which is also in line with the United Nation Sustainable Development Goals encompassing SDG3 Good Health and Wellbeing and SDG 12 Responsible Consumption and Production. So far, limited studies were reported in the East Coast of Malaysia, particularly in Kelantan on waste management practices at the household level [ 61 ] which is highly required to improve the current practices including finding the prospect of whether proper at source-sorting in households is feasible to be implemented. This study provides a case study in Panji, Kota Bharu concerning the current household characteristics and awareness of managing household solid waste in Kelantan. The findings are crucial for the waste authorities in the process of designing and providing an effective and specific action plan in the area.

Figure 2 shows the percentage of households by garbage collection facilities and median monthly household income (MYR) for the districts in Kelantan. Kota Bharu is the district with the highest median monthly household gross income and percentage of garbage collection facilities. Apart from Lojing, which is located in the highlands, Bachok, Tumpat and Pasir Puteh are the districts with the lowest percentage of garbage collection facilities within 100m of the households. Meanwhile, Bachok (34.9%), Pasir Mas (36.6%), and Pasir Puteh (38%) households are without garbage collection facilities. The figure described the problem with household solid waste management in Kelantan. The major issues contributing to the problem are due to insufficient financial resources, lack of human labor, and transportation [ 61 ]. In one of the rural area in Kelantan, it was found that the solid waste management is considered inefficient due to a lack of knowledge in proper waste handling and the importance of segregating waste properly as proper waste handling start at home (Abas et al. 2020).

figure 2

Percentage of households by garbage collection facilities and median monthly household income (MYR) for the districts in Kelantan

Household SWM is not a new issue, thus, published studies were found using survey and questionnaires and fieldwork studies. Waste characterization process was carried out by Kamaruddin et al. (2016) in 4 landfills in Kelantan. Nevertheless, they did not cover household waste knowledge, attitude and practices. Abdullah et al. [ 1 ] surveyed the household’s awareness on privatization of solid waste management and their satisfaction of the services offered but did not cover the health implications. Saat et al. [ 61 ] surveyed the practices and attitude on household waste management with a small sample size of less than 30 which limits its applicability to other region. Our study aimed to improve these previous studies by covering a wider sample size from the largest sub-district in Kelantan, Malaysia. The objective of this study is to assess the household SWM practices and perceptions among the residents of Panji vicinity in Kota Bharu district, Kelantan. Specifically, the objectives are to assess household SWM practices and perceptions in the Panji sub-district, to determine the association between socio-demographic characteristics or other factors and practices in SWM at the household level and to determine the association between socio-demographic characteristics or other factors and perceptions in SWM at household level.

This study was conducted in Panji, Kota Bharu district, Kelantan, Malaysia (Fig. 3 ), located at the east cost of Peninsular Malaysia and has the highest population among the 15 sub-districts of Kota Bharu, the capital state of Kelantan. A total of 338 respondents were recruited in this study. The population of interest in this study involved residents in Kota Bharu district and considered only residents who have attained 18 years old and above. Sample unit is residents living in Kota Bharu district of more than a year and aged more than 18 years. The target population comprised all the households in Kota Bharu District (491,237); however, it is impossible to conduct a study with such a large number within a limited time period and inadequate financial budget. Therefore, a multi- stage random sampling technique was used in selecting the appropriate sample in order to evaluate the objectives of this study and to ensure that households in the districts had the same possibility of being included in the study (Dlamini et al., 2017). Initially, one district of Kelantan state (Kota Bharu) was selected out of 10 total districts. In the second stage, one sub-district of Kota Bharu District (Panji) was selected out of 15 total sub-districts. Eventually, 338 households were randomly selected as sample size. Convenient sampling was also used to select respondents due to time constraint and response obtained from target population. The localities involved were Kampung Tapang, Kampung Chempaka, Kampung Belukar, Kampung Panji, Taman Sri Iman, Taman Desa Kujid and Taman Bendahara.

figure 3

Location of the study area in Panji, Kota Bharu district, Kelantan, Malaysia (Source:ArcGis Software version 10.2; source of shape file: Department of Drainage and Irrigation, obtained with consent)

Data collection

A survey was conducted from January to May 2018. The questionnaire was translated from English to Malay language and the translation was done back to back and validated by experts in environmental science and public health field. A pilot test was conducted with a small sample size of ~30 to determine the suitability of the items in the questionnaire and the time taken by respondents to complete the questionnaires (Dlamini et al. 2017). Respondents were interviewed based on a questionnaire adopted and modified from Asante et al. [ 9 ]. The questionnaire involved two phases; the first one was to determine the socio-demographic of the respondents, including gender, age, types of housing, religion, educational level, occupation and the number of occupants in the household. Part two was an assessment to determine the status of household management of solid waste. The questionnaire included both open and closed questions (Dlamini et al. 2017). The closed questions were designed for ease of answering by the respondents with the aim of collecting the maximum appropriate responses, whereas the open questions are intended to encourage respondents to provide further elaboration on certain questions. The reliability of Cronbach’s alpha test of this questionnaire was found to be acceptable (α=0.71). Ethical approval for this study was obtained from the Ethic Committee of Universiti Sains Malaysia (USM/JEPeM/17100560).

Data analysis

Data were analyzed using IBM Statistical Package for Social Science (SPSS) version 24.0. Descriptive analyses were used to report the frequency and percentage of socio-demographic patterns, method of household waste disposal and perceptions of household toward waste management. Chi-square goodness of fit test was used to determine the relationships between categorical variables, which allow us to test whether the observed proportions for a categorical variable differ from the hypothesized proportions [ 24 ]. The null hypothesis of the Chi-Square test is that no relationship exists on the categorical variables in the population; they are independent. Chi-square bivariate correlation test was performed to observe the correlation between the perceptions of waste segregation with socio-demographic background of the respondents [ 29 ]. The correlation between perception of respondents with the locality, house type and waste type were also conducted. Principal component analysis (PCA) was conducted to identify grouping of variables and to establish which factors were interrelated in any given construct, where a set of highly inter-correlated measured variables were grouped into distinct factors [ 24 ]. The Kaiser-Meyer-Olkim (KMO) Measure of Sampling Adequacy and Bartlett's Test of Sphericity was performed to evaluate the data's suitability for exploratory factor analysis [ 69 ].

Socio-demographic Characteristics and Respondents Background in Panji sub-district

We first report descriptive statistics for all variables before discussing results from correlation analysis of socio-demographic factors and respondent’s background with household solid waste management (SWM) practices and perceptions. We then present the Principal Component Analysis (PCA). Table 1 represents the socio-demographic background and characteristics of the respondents in this study. Most of the respondents are from Kg. Belukar (N=125, 37%), followed by Kg. Panji (N=61, 18%), the rest are from Kg. Tapang (N=33), Kg. Chempaka, Taman Desa Kujid, Taman Sri Iman (N=30, respectively) and from Taman Bendahara (N=29). Majority of the respondents are female (N=182, 53.8%) and age between 35 to 49 years old (N=91, 26.9%). Most of the respondents have completed secondary education (N=194, 57.4%) and 31.1% have completed their degree or diploma (N=105). Majority of the respondents are married (75.7%), Muslim (97%) and earned between MYR 1000 to 2000 per month. About 32% of the respondents are self-employed and lived in a bungalow house type (30.5%). Most of the household consist of 4 to 6 occupants (53.6%). Majority of them cook at home (91.4%) on daily basis (68.6%). The Chi-square test shows that there is a significant difference among all categorical variables except for gender (χ 2 = 2.000, p = 0.157).

Proportion of Household Solid Waste Disposed by respondents in Panji Sub-District

Figure 4 represents the type of waste disposed of by respondents in the study. More than half (74.38%) of the waste disposed by household is food debris, followed by plastic waste (19.01%) and bottles (5.79%) while the rest accounts for 0.83%.

figure 4

Types of waste disposed by household in Panji district

Household SWM practices and perceptions among respondents in Panji sub-district

Table 2 shows the household waste management practices and perceptions among respondents in Panji district. In terms of the household SWM practices, about 170 of the respondents (50.3%) segregate their waste at home while the remaining 168 respondents (49.7%) did not practice waste segregation at home. There is no significant difference between those who segregate waste at home and those who don’t (χ 2 =0.12, p=0.91). As shown in Fig. 1 and Table 2 , the major type of waste disposed by respondents are food (N=251, 74.3%). A significant difference was found among the different type of waste disposed (χ 2 =656.56, p<0.001). Out of the 338 respondents interviewed, 75.4% of the respondent themselves normally carries their household waste to the allocated bin or waste collection point provided by the local authority. Majority of the respondents (323 respondents) agree that the waste disposal site provided by the local authorities were appropriate (95.6%) relative to 15 respondents who disagree (4.4%). A significant difference was found between those who responded that appropriate waste disposal site was provided and those who do not (χ2=280.66, p<0.001).

Most of them also have the perception that proper waste management is important (99.7%). More than half (62.4%) of the respondent agrees that it is their responsibility to clean the waste in their residential area while 24.3% suggested that it is the responsibility of the district council. Another 3.3% suggested it is the responsibility of the community members followed by private waste operators (1.5%). The majority (95.9%) of the respondents suggested poor waste management can contribute to disease occurrence, whereas 2.7% suggested it does not cause diseases and another 1.5% were unsure if it causes any diseases.

In terms of the household SWM perceptions, 40.8% of the respondents have responded that other diseases than diarrhea, malaria and typhoid are related to improper waste management. This is followed by diarrhea (30.5%) and malaria (21.9%). Majority of the participants responded that they have awareness on proper waste management (92.9%) and 81.4% responded that cleanliness is the main factor which motivates them to dispose the waste properly. The chi-square test shows that all variables under respondents’ perception differ significantly from the hypothesized values (Table 2 ).

Relationship between socio-demographic characteristics, respondent’s background and household SWM practices (waste segregation practices)

Chi square analysis was performed to find out what factors contribute to waste segregation practices among the respondents (Table 3 ). Results indicate that waste segregation practice was correlated with the locality (χ 2 = 43.35, p<0.001). For instance, out of 29 respondents in Taman Bendahara, all of them segregate their waste (100%). This trend was also observed for Taman Desa Kujid where most of the respondents segregate their waste (22 out of 30, 73.3%). In contrast, most of respondents from the village, did not segregate their waste. For example, out of 125 total number of respondents in Kg Belukar, 53 of them segregates their waste (42.4%) while 72 of them did not (57.6%).

A significant correlation was found between waste segregation practice and age (χ 2 =11.62, p<0.001). Based on the age range of the total number of respondents, respondents at the age of 50-65 years old are those who segregated more than the rest (N=43) and those at the age of 35-49 are those who did not segregate their waste the most (N=52 in Table 3 ). The type of house was significantly correlated with waste segregation practice (χ 2 =12.73, p=0.03). The respondents who live in bungalow houses are those who segregate the most (N=58). Those who live in semi-detached houses also have more respondents (N=24) segregating their waste than those who did not (N=13). Meanwhile those who live in other type of houses, terrace, village and others have more respondents who did not segregate their waste (Table 3 ). Other variables, gender, education level, marital status, monthly income, occupation, the number of persons per household and the practice of cooking at home did not show any significant correlation with waste segregation practice (p>0.05, Table 3 ).

Relationship between respondent’s background and household SWM practices (the type of waste disposed) from the household in Panji sub-district

The chi-square test was also conducted to determine the relationship between socio-demographic characteristics, respondent’s background and the type of waste disposed. There is a significant correlation between locality with the waste type disposed in Panji district (Table 4 ). All localities showed that food waste was the major type of waste being disposed of from the households. A significant correlation was also found between respondents living in different house types with type of waste disposed. Most of the respondents who live in bungalows (N = 81) and other type of house (N = 78) disposed of food as the main waste from their households. Other characteristics were not significantly correlated with type of waste.

Correlation between respondents’ background (locality and/ or house type) and the perception in household SWM (appropriate site of household waste disposal provided by the local council and improper waste management contribute to disease occurrence)

Correlation analysis was also performed to determine what factors contribute towards the perception of household SWM in Panji district. No significant correlation was found between different locality with the appropriate waste disposal site provided (p = 0.152) as most of the locality has an appropriate disposal site (Table 5 ). There was also no significant relationship between type of house with appropriate disposal site provided by the local council (p=0.131). On the other hand, significant correlation was found between locality and the respondent’s perceptions on improper waste management which contribute to disease occurrence (p=0.042). Out of all localities, majority of the respondents from Kg Belukar has the perception that improper waste management contributes to disease occurrence (Table 5 ).

Principal component analysis (PCA)

Principal Component Analysis (PCA) is a dimension-reduction tool that can be used to reduce a large set of variables to a small set that still contains most of the information in the original large set [ 24 ]. It converts a set of observations of possibly correlated variables (entities each of which takes on various numerical values) into a set of values of linearly uncorrelated variables called principal components [ 37 ]. This transformation is defined in such a way that the first principal component has the largest possible variance (that is, accounts for as much of the variability in the data as possible), and each succeeding component in turn has the highest variance possible under the constraint that it is orthogonal to the preceding components.

PCA in this study was performed to determine the variables that influence or related to waste segregation behavior among respondents. Table 6 highlight the PCA analysis to illustrate the component factors that influence waste segregation behavior among respondents in this study. Only 13 significant variables were highlighted in the table with the factor loading of more than 0.5. Only factor loadings value >0.5 are considered for selection and interpretation due to having significant factor loadings influence the acceptable KMO value that represent a significant correlation for the PCA model in the study. The PCA generates four principal components that represent 48.26% of the total variance in the variables dataset and produced an acceptable KMO value of 0.603 (more than 0.5). Bartlett’s test of sphericity showed that PCA could be applied to the data at the p< 0.001 level. This approved that the data met the requirements for factor analysis [ 24 , 69 ].

The component matrix produced in PCA showed that PC1 represents 17.94% of the variance with high positive loading (positive relationship) on age, marital status and, type of house (Table 6 ). This pattern indicates that age, married and type of house were the group that segregates their waste the most. This group of community can be proposed as the target to actively participate in waste management practices within the district. In contrast, locality and education have negative loading or negative relationship with the segregation activity. As a result, policy makers should increase educational activities on proper household waste practices and management related issues to minimize both the environmental and health impacts of household waste practices among the population.

PC2 represents 10.93% of the variance with high loadings on cooking at home and cooking frequency. This pattern implies that those who cook at home and frequently cook were among the most respondents who practice waste segregation. However, no consequences can be drawn about individual factors as these may have the opposite relationship to the observed factor in other components. Similar trend was observed for PC3 whereby 9.96% of the data variance has high loading on the perception of the respondents towards waste management. High loading was observed on perception that improper waste management contributes to disease occurrence and the cleanliness is the main element that motivates them to segregate. PC3 has high negative loading with monthly income. This result suggests that respondents with low income are those who segregate more.

Meanwhile, PC4 represents 9.42% of the data variance. Variables that have high positive loadings were the respondents who brought the waste to the communal bin themselves, indicating that this group of respondents are those who segregate more. High positive loading was also found on the perception that residents are among those responsible for cleaning the residential area. The number of persons living in a household has negative loading in PC4, indicating that the higher the number of people lives in the household, the lesser chances of them to segregate the waste.

Extraction Method: Principal Component Analysis.

a 4 components extracted.

b Only cases for which Practice of waste segregation = Yes are used in the analysis phase.

This study explores the behavioral perspective in view that the way people manage waste is associated with their attitude and perception. Individual perception is governed by their background and present situation, shaped by values, moods, socials circumstances and individual expectation (Kaoje et al 2017). The results of this study are discussed from three aspects: (1) characterization of household solid waste management practices and perceptions among respondents (2) correlation between socioeconomic and respondent’s background with waste segregation practices and (3) correlation between socioeconomic and respondent’s background with household waste management perceptions. One of the primary intentions of acquiring the respondent’s characteristics was to understand the correlation between level of involvement in household SWM practices and the characteristics of the respondents.

Food waste was found as the major type of waste disposed by the communities in Panji sub-district (Fig. 1 and Table 2 ). Food waste has high moisture content and causes smell, which subsequently attracts disease vectors, such as flies, mosquitoes and cockroaches, and the proliferation of rodents, such as rats and mice, which pose threats to public health [ 68 , 75 ]. Majority of the respondents were found to cook at home (N=309, 91.4%) and cook on a daily basis (N=232, 68.6%; Table 1 ) which suggests that composting should be incorporated as one of the main approaches for proper waste management practices in the community. Individual compost bin should be provided in each household coupled with adequate training on simple compost technique can be organized within the locality as a stage by stage process. Alternatively, community scale composting can be proposed to focus solely on food waste management which is currently a growing practice among Malaysians [ 38 , 56 ]. This approach is gaining attention because of their lower energy footprint, ease of operation, need for lesser resources, lower operation and maintenance costs which have higher chances of public acceptance [ 32 ]. Food waste is organic waste which can decomposed and degraded into organic matter [ 33 ], which in turn can be used by the public to fertilize their garden soil. Most importantly, the training should emphasize on the practicality and feasible option of composting which is otherwise seen as a time-consuming and burdensome process [ 33 ].

Composting is beneficial to the environment by reducing greenhouse gases emissions and improvement of soil quality when applied to land. Furthermore, it is also in line with the circular economy concept by closing the loop of the system [ 14 ]. On the other hand, there are issues pertaining to its quality such as the nutrient and trace metal content. So, sorting the waste at source play a crucial role in minimising these impurities and collection systems play a fundamental role in removing some pollutants from wastes, especially organic fraction of municipal solid wastes, and improving compost quality [ 13 ]. One way to overcome this is by accommodating the waste collection and composting facilities with easy and convenient measurement of these contents which may be accessible by the community. Community composting programs should incorporate not only the step-by-step procedure of how to do composting but at the same time introducing easy to use kit or techniques applicable to the public and community such as test strip to measure the nutrients and trace metal [ 11 ]. In addition, by adding composting accelerators, the nutritional quality of the compost can be overcome. This factor can be done by developing a manual for public use.

The case of local composting at homes reduces transportation and collection cost by decreasing the amount of domestic waste carried to centralized composting facilities [ 76 ]. At the same time, household waste contains impurities and are widely distributed which hinders the efficiency of centralized composting facilities in disposing them. Centralized composting facilities in Asia suffer from low compost quality and poor sales [ 32 ]. As a result, community composting system at a smaller scale is more convenient within this region.

Composting is linked to diseases such as Aspergillosis, Legionnaire’s disease, histoplasmosis, paronychia and tetanus. In the case of Aspergillosis and Legionnaire’s disease, it may cause higher potential risk in large scale composting facilities compared to the smaller scale composting at home due to massive handling and agitating process in the former [ 26 , 59 ]. Histoplasmosis have been associated with chicken manure used in composting, however it is not able to survive in a well-done composting process [ 39 ]. Therefore, disease spread can be minimised by having local composting at homes and community composting system at a smaller scale than centralized composting facility. The most important thing in minimising disease spread would be the practise of wearing gloves and face mask during this composting activity.

In this study, there was not much difference between the respondents who separated their waste and who did not (Table 2 ), which implies there is room for increasing the practice of waste segregation. Waste segregation practice is lacking in developing countries, most prominently in Asia ( [ 15 , 48 ]; Vassanadumrongdee and Kittipongvises 2018) and African continents (Dlamini et al. 2017; Yoada et al. 2014). Since respondents lack adequate knowledge on the critical importance of waste separation at source in general, the volume of municipal solid waste dumped in landfill sites are progressively increasing, thus jeopardizing the remaining landfill space at a faster rate than initially planned. Therefore, to alleviate this environmental problem in the developing countries in general and in Panji sub-districts, specifically, more focused and sustained public awareness programs, integrated with an enabling infrastructure, are required to change residents’ perceptions toward improved waste separation at source rates [ 49 ]. Additionally, the outcome of the waste segregation activities should be similarly emphasized and how waste minimization in the first instance, and waste segregation at source, will benefit and enhance the standard of living or life quality of households ([ 44 ]; Yoada et al. 2014 [ 49 ];).

The perceptions of the respondents towards waste management were generally good. About 99.7% reported that waste management is important, 62.4% report that it is the responsibility of them to manage waste (Table 2 ). Resident’s participation in waste management activities is one of the ways in maximizing the capture of source-segregated materials which can be facilitated by providing an associated infrastructure [ 58 ]. Nevertheless, there are still some respondents who felt that waste management is not their responsibility, but instead lies mainly on the district council, which highlights the general perception of some Malaysians that waste is a local municipal issue [ 46 ]. About 95.9% of the respondents were aware that improper waste management leads to sicknesses or diseases, which implies that most of the households were aware of the health implication of waste. The management of MSW in developing Asian countries is driven by a public health perspective: the collection and disposal of waste in order to avoid the spread of disease vectors from uncollected waste [ 5 ]. The perception of the remaining 2.7% that waste management does not cause disease and 1.5% who were unsure need to be changed by targeting this group as a follow up program focusing on waste management and health issues. The respondents also have adequate level of awareness and knowledge about proper waste management (92.9%). This high level of awareness is because of several reasons for properly disposing of waste, including cleanliness as the major factor (81.4%), followed by fear of illnesses (12.4%), and odor (6.2%).

Most of the respondents thought that improper waste management could lead to diarrhea and malaria (Table 2 ). Diarrhea and waste management is associated with environmental factors such as waste disposal mechanism. House-to-house waste collection has been shown to decrease the incidence of malaria compared to other waste collection method [ 7 ]. Hence, this implies the possibility of malaria incidence in areas which burn their waste and areas which are inaccessible by any waste collection. Other diseases could be related to typhoid, dysentery, cholera, respiratory infections and injury [ 42 ]. Proper waste management can lead to improvement in the quality of the environment and public health while, mismanagement of waste can be implicated with water, soil and air pollutions [ 1 ], breeding of mosquitos, which in turn, causes disease [ 15 , 68 ]. Although knowledge and awareness are acceptable among the respondents, this perception did not inculcate into waste segregation practices. In order to bridge the gap between awareness and behavior change, it is necessary for individuals to understand the importance of their role in how to do it and why it is important to do so [ 34 ]. More focused, detailed and continuous awareness and knowledge should be emphasized on this aspect specifically in the topics of environmental cleanliness, drainage systems, the recycling process in theory and practice, and a proper way to dispose of wastes [ 61 ].

Our findings have reported that socio-demographic factors (age, marital status) and respondents’ background (locality and house types) have influenced the household waste practices and perceptions in Panji sub-district (Tables 3 , 4 , 5 and 6 ). Age is associated with the maturity of the person which plays a significant factor in impacting their level of awareness on environmental health and sanitation ([ 12 , 17 ]; Meneses and [ 40 , 45 ]). The result of our study is consistent with the findings by Fan et al. [ 22 ] that older individuals prefer to engage more in waste sorting activities than young people in Singapore.

On the other hand, the number of children in the household may be a significant factor that influence waste separation. This for instance has been mentioned in Xu et al., (2017), where the intention of middle-aged adults towards behaving a more eco-friendly system was affected by critical social reference groups around them, such as the interaction with family or the motivation, especially children, and/or the consideration of the health situation of the whole family.

However, in other studies such as in Ittiravivongs [ 28 ] and Vassanadumrongdee & Kittipongvises (2018), socio-demographic variables became insignificant factors that influenced waste segregation participation. Knussen et al., [ 36 ] & White & Hyde [ 73 ] also indicate that the strongest variable influence participation in waste segregation program was past behaviour on regular source separation at home or recycling habit. Having waste separation in the office also could have positive influence on source separation intention, which is consistent with the study of Saphores et al. [ 64 ].

Considering number of children in the analysis is beyond the scope of this paper. Our result indicates that there is no significant difference in the waste segregation practice by the number of occupants in the household (χ 2 = 2.36, p = 0.31). For instance, the results show 54.2% of household with more than 6 occupants practice waste segregation, as compared to those who are not at 45.8%. This would suggest that the number of children in the house could be less influence on the waste segregation practice or vice versa. Future study may consider number of children in the family as one of the variables to be tested to confirm the hypothesis.

It was interesting to note that the types of housing in the case study were found to contribute heavily to the practices and perceptions of household waste management. Respondents who lived in bungalows (30.5%) and other type of houses than semi-detached, terrace and village (28.4%) are most likely to segregate their waste. Bungalows are associated with high income areas in Malaysia [ 53 ], which could be related to waste collection services are provided from these areas and possibly these households subscribe to this service. Potentially, these types of houses also have more space to be allocated for waste sorting than the other type of houses.

Other socio-demographic characteristics such as gender, education level and monthly income did not influence the practices and perceptions of the respondents. There were no significant associations between gender and waste segregation practices (χ 2 =0.596, p=0.440). Our finding is contrasting to the study by Ehrampoush and Moghadam [ 18 ] which reported that gender is likely to have an influence on the perceptions of household SWM. This view is supported by Mukherji et al. [ 48 ] who found that women, because of traditional gender roles associated with their household activities, have a closer engagement with waste management at household level.

The level of education has been reported as an important factor that could influence people’s perception of household waste management [ 40 ]. In this study, most of the respondents received their education until secondary school (57.4%), followed by diploma or degree (31.1%) but this did not influence their household SWM practices and perception (χ 2 =6.188, p=0.19), in particular waste segregation practice (Table 3 ). The poor average income of respondents is considered a very important variable that could influence people’s perception and attitudes negatively on solid waste management system (Parfitt et al. 1994 [ 40 ];). But, this is not the case in our study as economic consideration appears not to play a major role in the respondent’s perception as well as attitude to solid waste management practices (χ 2 =4.55, p=0.47).

The outcome from the PCA analysis showed that age, marital status and type of housing are the factors which contributed the most to waste segregation practices at home. Our finding agrees with the study by Vassanadumrongdee and Kittipongvises (2018) which found that age and family with children have a positive influence on respondent's source separation. Age was also a determinant factor in waste management practices in other studies [ 2 , 15 ]. With aging and married respondents, this could be highly related to the increasing sense of responsibility towards the environment and the importance of increasing the quality of life among household members. Types of housing could be related to either waste collection services were provided in these areas or that limited number of households subscribe to their service. Other studies in the literature have reported on the positive relationship between residence types and waste separation practices ([ 15 ]; Vassanadumrongdee and Kittipongvises 2018).

The high loadings on cooking at home and cooking frequency towards waste segregation practices indicate that these groups of respondents can be chosen for further interventions in terms of adopting proper waste management practices such as small-scale composting, recycling and waste minimization practices. The lifestyle of the respondents plays a significant role in the daily waste disposal practices in households (Yoada et al. 2014 [ 15 ];). The link between improper waste management practice and disease occurrence was also reported in studies in Ghana (Yoada et al. 2014 [ 2 ];). Their studies also reported that cleanliness was the main factor which motivates them to segregate the waste which is concurrent with the findings in this study.

Education is negatively related to waste segregation activity (Table 6 ), indicating that people with lower education are more willing to segregate their waste as compared to those with higher education. The likely reasons could be related to different lifestyle and time constraint to allocate purposely for waste sorting activities [ 15 ]. People with higher education level may be spending most of their time at the workplace, and not at home. However, more educational campaign should be promoted by emphasizing on the benefits of waste segregation activities. Sufficient knowledge, such as clear instructions provided in a communication and collection campaign, can increase the probability of waste separation behavior (Vassanadumrongdee and Kittipongvises S 2018).

The higher number of occupants living in the household is associated with a less likely chance of segregating the waste (Table 6 ). The result of our study is consistent with the study by Addo et al. [ 2 ] which reported that household sizes of 4 to 6 and above 7 were less likely to engage in the practice of waste management as compared to household size below 4 people. This is probably due to the household size tends to reduce the quantity of household waste and the practice of waste management. In contrast, studies by Osbjer et al. [ 54 ], indicate that waste management practice is associated with a higher number of people in the households, which could possibly be due to the need to handle waste generated by larger populations within the household.

One of the objectives of this study was to determine variables that influence waste segregation behavior among respondents. The PCA was adapted for this objective rather than correlation analysis for several reason. The correlation coefficient assumes a linear association where any linear transformation of variables will not affect the correlation. However, variables X and Y may also have a non-linear association, which could still yield a low correlation coefficient [ 30 ]. In addition, the correlation coefficient cannot be interpreted as causal.

It is possible that there is a causal effect of one variable on the other, but there may also be other possible explanations that the correlation coefficient does not take into account. Since several variables may influence respondent’s behavior on waste segregation activity at one time, the correlation coefficient analysis may not adequate to identify the significant variables and the connectivity between them accurately. Therefore, PCA was used to help us understand the connection between these variables as it can identify the correlation among the features efficiently.

There are thousands of features in the dataset that possible to highlight some trend or the influence of one factor to another. There are challenges to visualize the algorithm on all features efficiently especially when the performance of the algorithm may reduce with the bigger dataset. The PCA improve the algorithm performance by getting rid of correlated variables which don't contribute to the model and the analysis of the algorithms reduces significantly with less number of features. The Principal Components are also independent of one another. There is no correlation among them. It also reduces overfitting by reducing the number of features where it mainly occurs when there are too many variables in the dataset.

The scenario of the covid-19 pandemic contributes to a significant challenge in managing household waste management globally and specifically in developing countries. Waste management in the pandemic scenario requires consideration in SARS-CoV-2 transmission through MSW handling that includes survival time of the virus on the surfaces: population density and socioeconomic conditions [ 35 ]. In general, waste management phases (waste packing and delivering by the users; waste withdrawal; waste transport; and waste treatment) exposed the community and workers to direct contact with contaminated objects and surfaces; as well as contact with airborne droplets at a distance that may lead to the covid-19 [ 16 ]. Due to these reasons, waste management practices are designed to respond to the pandemic through changes in the collection system, allocation of treatment options, safety measure and priority separation, and functionality of circular economy strategies [ 72 ].

As a developing country, it is predicted that the effect of covid-19 on the waste management practices are more crucial due to the increase in disposable personal protective equipment at the household level and changes in eating habits, as a consequence of lifestyle disruptions and psychological stress due to lockdowns [ 4 , 55 ]. Developing countries have a higher risk of waste and wastewater contamination, leading to significant public health issues [ 71 ]. Inefficient waste management practices such as insecure landfills, lack of technical knowledge, scientific and economic resources, and lack of waste emergency policies produce severe consequences to the community and workers [ 63 , 65 , 71 ].

In order to improve the level of household solid waste management in the study area and Malaysia in general, it is important to empower the key drivers. The key drivers can be categorized as institutional-administrative, technological, economical, and social drivers [ 70 ]. A strong policy that implements direct regulation and enforcement; provide economic incentives or disincentives; and inform, interact and engage with the community are required [ 60 ].

Household solid waste management technologies that are being practised globally are landfilling, incineration, pyrolysis, Refuse Derived Fuel (RDF), gasification, and anaerobic digestion [ 57 ]. As a developing country that focuses on solid waste management through landfilling, it is important to put extra attention on: i. decentralization of household solid waste management; ii. segregation at the source; iii. hygienic and safe handling; iv. flammable landfilll gasses handling; v. soil salinity from compost application; vi. Sustainable landfill management; vii. alternative markets for energy products; and viii. Implementation of the “pay as you throw” system [ 50 ].

Practical Implications, Study Limitations and Future Perspectives

This study highlights that waste segregation practice among respondents are still low and food waste are mixed with other household waste. This study provides as a baseline data in the region where less study was emphasized.

Quantitative and qualitative approach were used in this study by adopting descriptive and statistical analysis to improve the significance of the issue. Despite the significance of some aspects of this study, further studies should be done to incorporate children and teenagers as the participants and a more detailed questionnaire incorporating detailed health implications. Apart from that, a cross-sectional survey using random sampling technique was used to assess the household SWM practices and perceptions among the residents. This study is also limited to only Panji sub-districts which requires a wider region to generalize the findings of the study. The survey questionnaires depend on self-reporting manner, which may be subject to bias. Further study is recommended to engage observation at houses or at the waste collecting points to complement the survey. Moreover, the association between household socio-economic factors and health implications were limited. Future study should address this factor for a more focused and sustained public awareness programs.

Conclusions

The study found that the waste segregation practice among respondents can be considered as low, where the number of respondents who segregate their waste was equivalent to those who did not, which implies there is room for improvement. The main component of solid waste generated at home was largely food debris that has the potential to be composted and plastics that can be recycled, which were mainly disposed without separation. The local solid waste management authority should focus on utilizing this organic waste through a larger scale and wider involvement of the locals in composting program. The growth of small-scale community-based waste composting can act as a potential start up venue in accelerating this program, without the necessity of extensive investment by the local authority. The authority in the study area has provided appropriate waste disposal sites, but there are also some that were disposed in inappropriate sites. Majority of the respondents were also aware that improper waste management can lead to diseases. Age, marital status and, type of house was found to be the group that segregate their waste the most, indicating that respondents which fall under this category can be the target for further intervention programs. This study suggests the local authorities to design waste separation programs that suit the needs of targeted population, to ensure high participation rate among the community. Marketing and campaigns should emphasize the positive perception and attitude towards waste separation at home and also negative perception of non-participants. This study may provide authorities in Malaysia with baseline information to set the future implementations of waste segregation activities in households. This study also suggests focusing on inculcating community involvement in doing waste separation at source, waste reduction and recycling as a habit and way of life. The local authority may facilitate this activity by providing bins to segregate wastes, establishing waste banks and recycling facilities at a wider scale than the scattered existing ones. Both a top-down and bottom-up approach should work hand in-hand to realize the sustainable solid waste management as a success.

Nevertheless, acknowledging the limitations of the current study, a more detailed and thorough study should incorporate a wider region, in-depth association of waste separation programs and health implications. Combining survey questionnaire with statistical analysis act as a stepping stone to expand the study by engaging the community in actual waste separation activities. This can be done by initiating a collaboration between the local authority, the leader in a community and the residents itself as a pilot study. In addition, the findings of this study will serve as baseline evidence and pave the way for other researchers and policymakers to conduct more rigorous studies on this arena.

Availability of data and materials

The datasets supporting the conclusions of this article are included within the supplementary material section.

Abbreviations

Statistical Package for Social Science

Solid Waste Management

municipal solid waste

not in my backyard

Kota Bharu Municipal Council

Sustainable Development Goals

Malaysian Ringgit

Principal component analysis

Kaiser-Meyer-Olkim

Refuse Derived Fuel

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Acknowledgments

We are grateful to everybody who completed the questionnaires and to Miss Aisyah Ariff, Miss Zetty Hiddayah binti Zuharizam and Mr Wan Izulfikri bin Wan Mohd Roslan for assisting in data collection.

This study was financially supported by Ministry of Higher Education Malaysia (Postdoctoral Fellowship SLAB) and Universiti Sains Malaysia. None of the funders were involved in the design of the study, in the collection, analysis, and interpretation of data and in the writing of the manuscript.

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School of Industrial Technology, Universiti Sains Malaysia, USM, 11800, Penang, Malaysia

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WF contributed in conceptualization and writing the manuscript. NINI collected the data, contributed to the literature review and execute the project. SNSI contributed in the formal analysis, methodology, data curation and the tables and figures. MHJ contributed to editing of the manuscript. HA contributed in supervision, project administration and planning. All authors have read and approved the final version of this manuscript.

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Fadhullah, W., Imran, N.I.N., Ismail, S.N.S. et al. Household solid waste management practices and perceptions among residents in the East Coast of Malaysia. BMC Public Health 22 , 1 (2022). https://doi.org/10.1186/s12889-021-12274-7

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Olivier began the session by emphasizing the urgency of addressing methane emissions that are 84 times more impactful than CO2 over a 20-year period, making it a significant contributor to global warming. He pointed out that the waste sector is the third-largest contributor to these emissions. He emphasized the need for action, stating, " Fighting the methane war might be a simpler way to win the battle against global warming. " Further highlighting landfill operators' challenges, including outdated monitoring models and changing regulations, stressing the need for effective methane management in landfill operations.

The Global Response to the Urgency

The global initiatives, such as the Global Methane Pledge at COP26 and directives like the EU Methane Action Plan, underscore the increasing focus on methane emissions. The waste sector is now under scrutiny, with demands for better monitoring and control of methane emissions. This was the first-time landfills got some attention at COP28. As regulatory pressures mount and environmental consciousness grows, the need for accurate methane monitoring has never been more critical.

In the United States, the EPA is shifting its focus to tackle landfill emissions, allocating funding to improve outdated models, and prioritizing real measurements over estimated data. This signals a global trend towards more accurate and transparent methane monitoring practices.

The Innovative Approach to Real Mitigation

Moving from emission awareness to real mitigation action, Krish Kataria introduced GHGSat and highlighted the importance of satellite technology in addressing methane emissions: " We are the world's first and only company that measures greenhouse gas emissions at the individual facility level using high-resolution satellites. " GHGSat's pioneering technology provides a scalable solution to the challenges faced by the waste sector, offering accurate and validated data for better decision-making.

GHGSat's mission is to work with operators to help them localize emissions sources from landfills—mitigating 13MTCO2e emissions while detecting 84MTCO2e from landfills alone in 2023—staying true to its mission. Krish highlighted the significant room for improvement in the waste sector despite the availability of technologies to address challenges. She pointed out the differences in reporting standards, with reliance on outdated models for greenhouse gas emissions from landfills, leading to inaccurate calculations. Operators attempting to use real measurements face challenges due to the diverse and disparate nature of available technologies, making it difficult to compare results accurately.

This uncertainty around emissions data creates challenges in assessing the effectiveness of mitigation strategies such as gas capture systems or biomethane conversion, hindering the ability to determine ROI. Additionally, the constantly evolving regulatory landscape adds complexity, requiring compliance not just with current regulations but also with future standards.

Case Study: Waste Management Inc.

To illustrate the practical implications of these challenges and the potential solutions, Krish presented a case study centered around Waste Management Inc., America's largest waste management operator. It exemplifies how organizations are navigating the complexities of methane monitoring and mitigation. With 250 landfills in their portfolio, Waste Management Inc. has set ambitious sustainability goals, including a 42% reduction in scope one and scope two emissions by 2031. To achieve this goal, they have committed to implementing a methane monitoring strategy by 2025.

What sets Waste Management Inc. apart is their comprehensive approach to evaluating methane measuring technologies. They categorize technologies based on their ability to localize emissions and quantify them. Waste Management Inc. conducted a study across seven sites to determine the most accurate and scalable combination of technologies for their monitoring strategy.

One of the key findings of Waste Management Inc.'s study is the cost-effectiveness and scalability of satellite observations compared to other methods. While drones are known to be an effective tool for localizing emission sources, they are expensive to scale. In contrast, Satellite observations are up to 75% cheaper than drone measurements, making them a viable option for large-scale monitoring. The ability of satellites to capture 12 by 12-kilometer images provides a comprehensive view of landfill emissions, even in windy conditions. This capability is crucial for identifying emission sources and refuting any regulatory fines.

What Lies Beyond: The Future of Methane Monitoring?

After presenting a comprehensive case study on Waste Management Inc., Krish and Olivier delved into the future of methane monitoring. Krish emphasized the power of satellite data in justifying or refuting regulatory fines, highlighting its effectiveness in ensuring compliance. She then stressed the importance of accurate and validated data, indicating that the study demonstrated the effectiveness of satellite technology in providing such data.

The question, " Where do we go from here? " led to the emphasis on the need to quantify and report on real emissions, moving away from estimations. This highlighted the importance of data at scale and the layering of data from multiple sources to improve existing models or potentially develop new ones.

Krish and Olivier's presentation was not just a data dump. Instead pointed out the importance of choosing the right partner in methane monitoring – with solid financial backing, ownership transparency, and a commitment to providing accurate and reliable data. Olivier contrasted companies that were heavily VC funded, with quick gain financing schemes, to GHGSat, who prioritized data accuracy and trustworthiness. Olivier concluded by stating that satellite technology plays a crucial role in both localizing and quantifying emissions, furthering the work in methane monitoring and mitigation.

The integration of high-resolution satellite technology into methane monitoring represents a significant step forward in the fight against climate change. By providing accurate, scalable, and trustworthy monitoring solutions, these satellites are helping to mitigate the impact of methane emissions from landfills worldwide. As Krish and Olivier wrapped up their presentation, they left the audience with a call to action: " The time to act is now. We have the technology and the know-how to make a real difference. Let's not wait for tomorrow; let's start making a change today. "

Ready to take the first step in your methane emissions reductions journey? Contact us today to explore how our satellite emissions monitoring solutions can transform your landfill operations.

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