RESEARCH ON CARBON EMISSION CHARACTERISTICS OF MUNICIPAL SOLID WASTE INCINERATION LEACHATE TREATMENT SYSTEM

GANG Qinyan; MA Xiaoqian; LIU Chao; WANG Han; WANG Yayi

doi:10.13205/j.hjgc.202404004

Volume 42 Issue 4

Apr. 2024

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2024 > 42(4): 31-39

GANG Qinyan, MA Xiaoqian, LIU Chao, WANG Han, WANG Yayi. RESEARCH ON CARBON EMISSION CHARACTERISTICS OF MUNICIPAL SOLID WASTE INCINERATION LEACHATE TREATMENT SYSTEM[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(4): 31-39. doi: 10.13205/j.hjgc.202404004

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GANG Qinyan, MA Xiaoqian, LIU Chao, WANG Han, WANG Yayi. RESEARCH ON CARBON EMISSION CHARACTERISTICS OF MUNICIPAL SOLID WASTE INCINERATION LEACHATE TREATMENT SYSTEM[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(4): 31-39. doi: 10.13205/j.hjgc.202404004

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RESEARCH ON CARBON EMISSION CHARACTERISTICS OF MUNICIPAL SOLID WASTE INCINERATION LEACHATE TREATMENT SYSTEM

doi: 10.13205/j.hjgc.202404004

1. State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University,Shanghai 200092, China;
2. Shanghai Environment Group Co., Ltd.,Shanghai 200000, China

Received Date: 2023-11-10
Available Online: 2024-06-01

Abstract

Abstract

The composition of leachate from municipal solid waste (MSW) incineration is complex and has high concentrations of pollutants, making its treatment system an important source of greenhouse gas emissions. However, the carbon emission characteristics of the incineration leachate treatment system are still not clear, which hinders the development and implementation of pollution reduction and carbon reduction strategies. Therefore, in this study, the inclination leachate from a typical MSW incineration plant in Shanghai was selected as the research object. The carbon footprint of the incineration leachate treatment system was calculated using a life cycle assessment method. The study focused on the carbon emission characteristics of the leachate treatment system under different water quality and quantity conditions. The carbon emissions of different treatment units were quantitatively analyzed to provide a scientific basis for upgrading and transforming low-carbon treatment processes for incineration leachate and achieving coordinated pollution reduction and carbon reduction goals in China. The results showed that direct carbon emissions tended to be higher in spring and summer and lower in autumn and winter, with N₂O being the most important direct carbon emission source (0.4~47.7 t CO₂ eq); indirect carbon emissions were much higher than direct carbon emissions, with electricity being the largest source of carbon emissions (78.2~121.3 t CO₂ eq). In addition, external carbon sources could reduce direct carbon emissions to some extent but would increase indirect carbon emissions. Recovering CH₄ generated in the anaerobic digestion (AD) unit (0~160.3 t CO₂ eq) is an important pathway for achieving carbon neutrality in the leachate treatment system. Although the direct and indirect carbon emissions were reduced after waste classification, the limited carbon recovery led to an increase in net carbon emissions from the leachate treatment plant, causing the leachate treatment system a transition from a carbon sink to a carbon source. Overall, in the carbon reduction strategy for the incineration leachate treatment system, it is crucial to focus on controlling carbon emissions from electricity. Reducing direct carbon emissions can be achieved by improving denitrification efficiency. Upgrading and improving the two-stage anoxic/oxic(A/O) process in each leachate treatment unit is essential for achieving energy savings and emissions reduction.
- incineration leachate,
- greenhouse gas,
- carbon emissions,
- two-stage anoxic/oxic,
- garbage classification

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