城镇污水处理厂碳排放核算及减碳案例分析

Carbon emission accounting and carbon reduction case analysis in urban sewage plants

针对城镇污水处理厂的温室气体(GHGs)排放,建立实用量化的指标核算与分析方法,并明确优化其产(排)污关联参数与排放因子的取值。以某10万m3/d城镇污水处理厂为研究对象,核算出其2021年实际碳排放强度约0.43 kg CO_(2)/m^(3),碳排放源贡献中,电耗因素居首(贡献碳排放权重为35%),而药耗因素在排放总量的权重为23%,因此节能降耗协同,对于减污降碳优化管控尤显重要。基于污水处理厂碳排放的显著性影响因子及其变化,需做好敏感性分析。抓好污水处理厂大功率耗电设备的效能与优化分析调控,调控平衡脱氮与除磷在生化反应单元的竞争矛盾,优选碳源种类、抓好碳源QC/QA、精细内外碳源投量(控制总体△C/N在7~8)及提升其利用效率,助力节约优先与绿色低碳目标。

As to emission of greenhouse gases(GHGs)from urban WWTPs,it should be established a practical and quantitative index and accounting and analysis method,as well as optimized clearly the values of relevant parameters about sewage production(discharge)and emission factors.Take a 100000 m^(3)/d urban WWTP as the research object,it was calculated that the carbon emission intensity in 2021 was reached about 0.43 kg CO_(2)/m^(3),in what of the main carbon emission source,power consumption factor was ranked first(contribution ratio of carbon emissions was 35%),and ratio of chemicals consumption factor in the total emissions was 23%,therefore,the synergy of consumption saving of energy and chemicals is particularly important for the optimal control of pollution and carbon reduction of WWTPs.Sensitive analysis should be done well based on the significant influencing factors and changes of carbon emission of WWTPs.It should pay attention to the efficiency optimization and regulation of high power-consumption equipment in the WWTPs,and do well in regulating and balancing competition contradiction between nitrogen and phosphorus removal in the biochemical reaction unit,as well as optimize the types of carbon sources,pay attention to QC/QA management of carbon sources,fine carbon sources dosage(control total △C/N in the range of 7~8)and improve its utilization efficiency,so as to help give priority to saving and achieve the goal of green and low carbon.