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Implementation effect of municipal solid waste mandatory sorting policy in Shanghai
Yao Wang1, Yu Shi2, Jizhi Zhou3
1Department of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China; Shanghai Institute of Geological Survey, Shanghai, 200072, China.
Journal of Environmental Management
|August 26, 2021
Summary
Shanghai’s compulsory waste sorting has successfully increased food waste separation and residual waste heating value. Despite challenges like lower metal recovery, net carbon emissions from waste disposal are significantly reduced.
Area of Science:
- Environmental Science
- Waste Management
- Urban Sustainability
Background:
- Domestic waste source classification in Shanghai, initiated in the 1990s, faced challenges for thirty years.
- A compulsory waste sorting provision for Shanghai residents, implemented in 2019, has shown surprising success.
Purpose of the Study:
- To investigate the status and challenges of municipal solid waste (MSW) management in Shanghai under compulsory waste sorting rules.
- To analyze the efficiency of waste classification, characteristics of separated waste, and carbon emissions.
Main Methods:
- Tracking classification efficiency of MSW.
- Analyzing physicochemical characteristics of separated waste.
- Calculating carbon emissions from the waste disposal system.
Main Results:
- Achieved 83.62% separation of household food waste with 99.50% purity.
- Increased the lower heating value (LHV) of residual waste by 96.4%.
- Reduced net carbon emissions to 0.11 ton CE/ton waste, but noted lower metal recovery and higher chloride content in fly ash.
Conclusions:
- The compulsory waste sorting system in Shanghai is effective in improving waste separation and reducing carbon emissions.
- Challenges remain, including byproduct recovery and incineration facility capacity.
- Recommendations include refining source separation, enhancing resource recovery technologies, and optimizing incineration capacity.
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