改良型氧化沟用于污水处理厂提标及季节性运行效果分析

Applicationof Improved Oxidation Ditchprocess and Seasonal Operation Effect of WWTP

邯郸市某污水处理厂原采用曝气生物滤池(BAF)工艺,为配合国家和地区要求,需将出水水质由一级B提高至一级A排放标准。原始设计工艺为Mulitiflo沉淀池+曝气生物滤池(BAF),提标改造工程结合现有处理工艺设施,选用改良型氧化沟工艺作为改造工艺核心,深度处理沿用已建Mulitiflo高效沉淀池(结合化学除磷)+BAF工艺,以保证出水的稳定。通过对比分析改造前与提标改造后实际运行数据,表明经改造,各项指标出水水质已有明显改善。其中出水COD已满足地表四类水标准,接近三类水标准;出水NH_(4)^(+)-N已满足一级A标准,接近地表四类水标准;出水TN已满足一级A排放标准;出水TP已满足地表四类水标准,接近三类水标准,可实现年削减COD、NH_(4)^(+)-N和TN分别为12311.62 t/a、1529.23 t/a和1656.84 t/a,改造后处理成本为0.92元/m3,总成本增加0.12元/m3。生态效益明显。季节性分析发现,季节变化对各指标处理效果存在不同程度的影响,总体夏秋季节去除效果略好于冬季,尤其是NH_(4)^(+)-N和TN,说明低温对污水处理存在一定影响。

A wastewater treatment plant(WWTP)in Handan city originally used the aerated biological filter(BAF)process.In order to improve the effluent quality from grade A B to grade A A discharge standard,the bid improvement project added an improved oxidation ditch process on the basis of the existing process to enhance the system's function of nitrogen and phosphorus removal.Through the comparison and analysis of the actual operation data before and after the renovation,it is shown that the effluent quality of each index has been significantly improved after the renovation.The COD in effluent has met the four surface water standards and is close to the three surface water standards.The NH_(4)^(+)-N in effluent has met the first class A standard and is close to the surface water standard.The TN in effluent has met the discharge standard of Grade A.The TP in effluent has met the four surface water standards and is close to the three surface water standards.Which can realize years cut COD,NH_(4)^(+)-N and TN were 12311.62,1529.23,1656.84 t/a,ecological benefit is obvious.Seasonal analysis found that seasonal changes had different degrees of influence on the treatment effect of each indicator.The overall removal effect in summer and autumn was slightly better than that in winter,especially NH_(4)^(+)-N and TN,indicating that low temperature had certain influence on sewage treatment.