污水处理行业的碳排放定量评估及碳减排潜力挖掘是实现"双碳目标"的迫切需求.文章采用A/A/O工艺(A厂)和CASS工艺(B厂)两种典型工艺的污水处理厂为研究对象,核算框架以《污水处理厂低碳性能评估技术规范》(CAEPI 49-2022)为主要依据,研究结果表明,A厂总碳排放强度(0.43 kgCO2·m-3)比B厂(0.30 kgCO2·m-3)高0.13 kg CO2·m-3;两厂的间接碳排放均为主要贡献,分别占总碳排放强度的55.4％(A厂)、79.2％(B厂),其中,电耗贡献(A厂34.0％、B厂48.6％)均为间接碳排放的最大占比.相较CASS工艺,A/A/O工艺对COD的去除率高11.3％,对TN的去除率低6.8％,但A/A/O工艺总碳排放强度中CH4占比较CASS工艺多29.5％,药耗方面则低6.8％.降低电耗、药耗等间接碳排放是污水处理行业碳减排主要措施.
A/A/O and CASS Waste water Treatment Process Carbon Footprint Evaluation and Carbon Emission Reduction Measures
Quantitative assessment of carbon emission and exploration of the reduction of carbon emission in sewage treatment industry are urgent for achieving the goals of"carbon peak"and"carbon neutrality".In this study,sewage treatment plants adopting two typical processes,A/A/O(Plant A)and CASS(Plant B),are taken as the study cases,and the main accounting framework is based on the Technical Specification for Low Carbon Performance Evaluation of Sewage Treatment Plants(CAEPI 49-2022).The results showed that the total carbon emission intensity of Plant A(0.43 kgCO2·m-3)was higher than that of Plant B(0.30 kgCO2·m-3).The indirect carbon emissions of the two plants were the domi-nant contributions,accounting for 55.4％(Plant A)and 79.2％(Plant B)of the total carbon emission intensity,among which the power energy consumption contributions(34.0％in Plant A and 48.6％in Plant B)were both the largest share.Compared with CASS process,the removal rate of COD by A/A/O process was 11.3％higher,while the removal rate of TN was 6.8％lower.However,in the total carbon emission intensity of A/A/O process,CH4 accounted for 29.5％more than that of CASS process,and the chemical agents consumption was 6.8％lower.Reducing indirect carbon emission such as power con-sumption and chemical agents consumption is the major measure of carbon emission reduction in sewage treatment industry.
carbon footprintcarbon emission reductiongreenhouse gasesA/A/O processCASS process
万方数据
维普
