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ZHAO Zejia, TUO Haorui, XIE Xiangta, CHEN Jian, HAN Songlei, ZHAO Xiaoqing, LIU Xueming. Research on Characteristics of Carbon Emissions in Medium-sized Urban Sewage Treatment Plants Using Improved A2O Processes[J]. Journal of South China Normal University (Natural Science Edition), 2024, 56(1): 63-71. DOI: 10.6054/j.jscnun.2024008
Citation: ZHAO Zejia, TUO Haorui, XIE Xiangta, CHEN Jian, HAN Songlei, ZHAO Xiaoqing, LIU Xueming. Research on Characteristics of Carbon Emissions in Medium-sized Urban Sewage Treatment Plants Using Improved A2O Processes[J]. Journal of South China Normal University (Natural Science Edition), 2024, 56(1): 63-71. DOI: 10.6054/j.jscnun.2024008
shu

Research on Characteristics of Carbon Emissions in Medium-sized Urban Sewage Treatment Plants Using Improved A2O Processes

  • 1.

    Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Shanghai 200082, China

  • 2.

    College of Environment and Energy, South China University of Technology, Guangzhou 510006, China

  • 3.

    Shantou Housing and Urban-Rural Development Bureau Guang, Shantou 515041, China

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  • Received Date: August 28, 2023
  • Available Online: April 29, 2024
    Graphical Abstract
    • Abstract

  • The carbon-emission-factor approach was used to conduct the total carbon emissions and carbon emission intensity of 4 medium-sized sewage treatment plants with similar scale but different A2O processes in Shantou. The results show that the total carbon emissions with different A2O processes are different. The total carbon emission intensity of the 4 sewage treatment plants ranged from 0.317 to 0.402 kg/m3(CO2-eq). The carbon emissions in order from smallest to largest based on the processing are: multi-stage AO, A2O+anaerobic/hypoxia regulating tank, traditional A2O, A2O+micro-aeration oxidation ditch. However, the carbon emission categories of different processes are similar, and electricity consumption is the most important carbon emission source for each process. Compared with the traditional A2O process, the other three improved A2O processes have advantages in reducing carbon emission intensity of chemicals consumption, CH4 emission, N2O emission and sludge disposal. And the multi-stage AO process shows the greatest ability to reduce the total carbon intensity. Based on the above results, some suggestions for the carbon emission optimization of the improved A2O processes were put forward.

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