CARBON EMISSIONS OF URBAN AND INDUSTRIAL SEWAGE TREATMENT PLANTS OF SUZHOU

WANG Shuo; LU Yunping; LIU Shuyang; CHEN Kangli

doi:10.13205/j.hjgc.202310021

Volume 41 Issue 10

Oct. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(10): 173-184

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WANG Shuo, LU Yunping, LIU Shuyang, CHEN Kangli. CARBON EMISSIONS OF URBAN AND INDUSTRIAL SEWAGE TREATMENT PLANTS OF SUZHOU[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(10): 173-184. doi: 10.13205/j.hjgc.202310021

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CARBON EMISSIONS OF URBAN AND INDUSTRIAL SEWAGE TREATMENT PLANTS OF SUZHOU

doi: 10.13205/j.hjgc.202310021

1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;
2. Suzhou Institute of Environmental Science, Suzhou 215011, China;
3. Nanjing Institute of Environmental Science, Nanjing 210036, China

Received Date: 2023-02-04
Available Online: 2023-12-26

Abstract

Abstract

In the critical period of synergy between pollution reduction and carbon reduction in the 14th Five-Year Plan, the sewage treatment system is facing the problems of low accuracy and timeliness of carbon accounting, and the lack of effective analysis and evaluation tools for carbon emissions. Based on the pollutant reduction ratio of different processes of urban and industrial sewage treatment plants in Suzhou from 2001 to 2020, the time series data of localized carbon emission factors and carbon emissions were weighted and established. An extended Kaya identity factorization model of carbon emission in sewage treatment systems is constructed to quantitatively analyze the influence of seven factors, including technical effect, energy effect, sewage discharge intensity, industrial structure, economic effect, urbanization rate, and population size, on the change of carbon emission in sewage treatment plants. The study showed that carbon emissions of the sewage treatment system in Suzhou from 2001 to 2020 were 4306.6082 million tons of CO₂-eq, CO₂ was the main contributor, and the carbon emission factor was 1.3687~1.9499 kg CO₂-eq/m³; reducing CO₂ emissions from the sewage treatment process, and N₂O emissions from the sludge disposal process was the breakthrough point; the economy and population scale effects were the main factors to promote the carbon emission increment of urban and industrial sewage treatment plants, respectively, and the technical effect was the decisive factor to restrain the reduction. Finally, suggestions are put forward, including the reduction of carbon emission in urban sewage treatment plants, the improvement of low energy consumption of sewage and low N₂O emission technology of sludge, the promotion of water saving in the whole society, and the promotion of industrial upgrading by technological innovation.
- sewage treatment plant,
- carbon emissions,
- Kaya identity,
- CH₄,
- N₂O

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References

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