LIUXing,LIXu-fang,YUBo,et al.Carbon Emissions Calculation and Carbon Emission Reduction Strategy of Two-stage Drying + Pyrolysis and Gasification Process[J].China Water & Wastewater,2025,41(24):44-51.
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Carbon Emissions Calculation and Carbon Emission Reduction Strategy of Two-stage Drying + Pyrolysis and Gasification Process

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第41卷 Number: 第24期 Page: 44-51 Column: Date of publication: 2025-12-17
Author(s):
LIU　Xing1; 2;  LI　Xu-fang1; 2;  YU　Bo2; 3;  ZHAO　Hao4;  LI　Xiao-ning2; 3;  SHEN　Peng-fei1; 2
（1. China Tiegong Investment & Construction Group Co. Ltd.， Beijing 101300， China； 2. Eco? Environmental Research and Development Center of China Railway Group Limited， Beijing 101300， China； 3. China Railway Water Group Co. Ltd.， Xi’an 712000， China； 4. Xi’an China Railway Eco?environment Technology Co. Ltd.， Xi’an 710301， China）
Keywords:
carbon emission calculation;  carbon emission reduction;  sludge treatment and disposal;  pyrolysis and gasification;  municipal sludge
Abstract:
The sludge treatment and disposal process generates significant carbon emissions, with varying levels of emissions depending on the treatment methods used. As a new sludge treatment technology, research on the carbon emission accounting for pyrolysis+gasification process is limited. The carbon emissions of each link of the two-stage drying + pyrolysis and gasification process was calculated by using actual operation data from a municipal sludge treatment and disposal project, and the main source of carbon emissions was analyzed. During the trial operation of the case project, the total carbon emission for the sludge treatment and disposal process was 20 851 tCO2/a, and the average carbon emission per unit dry sludge was 1.732 tCO2/tDS, with the carbon emissions of drying stage accounting for 78.9% of the total carbon emissions, and the carbon compensation from the utilization of tailings was 0.162 tCO2/tDS. The carbon emission level of the two-stage drying + pyrolysis and gasification process was more favorable than the current mainstream sludge treatment and disposal methods in China, with a higher carbon compensation rate. Based on the actual project situation, three carbon emission reduction measures were proposed, including the optimization of the drying system efficiency, adopting photovoltaic power generation, and implementing the low-temperature denitration of flue gas. These measures can reduce the carbon emissions by 0.396 tCO2/tDS.
Last Update: 2025-12-17