某污水处理厂准Ⅳ类提标改造运行效能及碳排放分析

Analysis of operation efficiency and carbon emission of quasi ClassⅣupgrading and reconstruction of a sewage treatment plant

山东某污水处理厂为满足污水处理量和处理标准的要求,在《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A水质标准上进行提标改造,并采用“高效沉淀池+反硝化深床滤池”深度处理工艺,扩建了规模为60 000 m^(3)/d的“预处理+AAO+高效沉淀池+反硝化深床滤池+紫外线/次氯酸钠消毒”污水处理设施。对改造前后污染物去除效果及污水处理过程中的碳排放量分布进行分析,结果表明,改造后污染物的去除效果得到进一步强化与巩固,出水平均TN、TP分别为7.09、0.06 mg/L,去除率分别达到94.7%和99.1%,出水水质(TN除外)稳定达到《地表水环境质量标准》(GB 3838—2002)的Ⅳ类水标准;改造前后对碳排放贡献最大的均为CH_(4),改造后电耗在整体碳排放中占比增加16.49%,而药耗所产生的碳排放量降低了27.69%,由0.585 kg/m^(3)减至0.423 kg/m^(3)。

In order to meet the requirements of sewage treatment capacity and treatment standards,a sewage treatment plant in Shandong was upgraded and reconstructed based on the Class A water quality standard of“Pollutant Dis-charge Standards for Urban Sewage Treatment Plants”(GB 18918-2002).The advanced treatment process of“high ef-ficiency sedimentation tank+denitrifying deep bed filter”was adopted,and the sewage treatment facility of“pretreat-ment+AAO+high efficiency sedimentation tank+denitrifying deep bed filter+ultraviolet/sodium hypochlorite disinfec-tion”with a scale of 60000 m^(3)/d was expanded.The pollutant removal efficiency and carbon emission distribution dur-ing sewage treatment process before and after renovation were analyzed.The results showed that the removal effect of pollutants was further strengthened and consolidated after the transformation,and the average effluent TN and TP were 7.09 mg/L and 0.06 mg/L,respectively,and the removal rates of TN and TP reached 94.7%and 99.1%,respectively.The effluent quality(except TN)reached the ClassⅣstandard of the Environmental Quality Standards for Surface Wa-ter(GB 3838-2002).CH_(4) contributed the most to carbon emission before and after the transformation.After the transfor-mation,the proportion of electricity consumption in the overall carbon emission increased by 16.49%,while the carbon emission generated by the consumption of water agent decreased by 27.69%,from 0.585 kg/m^(3) to 0.423 kg/m^(3).