多点进水AAO-A+MBR工艺在低C/N污水处理厂的工程应用  

Engineering Application of Multi-Point Influent AAO-A+MBR Process in Low C/N Ratio WWTP

作　　者：沈超 任玉辉 SHEN Chao;REN Yuhui(Haining Water Investment Group Co.,Ltd.,Haining 314400,China;Shanghai Municipal Engineering Design InstituteCo.,Ltd.,Shanghai 200092,China)

机构地区：[1]海宁市水务投资集团有限公司,浙江海宁314400 [2]上海市政工程设计研究总院<集团>有限公司,上海200092

出　　处：《净水技术》2023年第1期168-173,共6页Water Purification Technology

摘　　要：海宁丁桥污水处理厂四期工程处理规模为5×10^(4)m^(3)/d,进水中工业废水占比高达50%,进水C/N较低。根据现有用地、进水指标及工艺运行情况,新建初沉发酵池+多点进水AAO-A+MBR工艺系统,采用多点进水耦合乙酸钠投加的多碳源分配脱氮保障方法,同时采用了将曝气池溶解氧控制在较低水平的策略。投入运行一年多,在进水COD_(Cr)、氨氮、TP、TN、SS平均质量浓度分别为254.0、29.30、3.09、31.60、126.3 mg/L的情况下,出水COD_(Cr)、氨氮、TP、TN、SS平均质量浓度分别为26.2、0.31、0.23、7.72、5.1 mg/L,出水水质稳定达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)中的一级A标准,单位直接运行成本为0.5330元/m^(3),具有良好的环境效益和经济效益。The design treatment scale of phase Ⅳ project of Haining Dingqiao WWTP is 5×10^(4) m^(3)/d,the proportion of industrial wastewater in the influent is as high as 50%,and the influent C/N is low.Based on the analysis of land use,influent quality indices and existing process operation situation of the WWTP,the pretreatment system of primary sedimentation fermentation tank+multi-point influent AAO-A+MBR process system is adopted.The method of multi-point influent coupled with sodium acetate dosing is employed to ensure the distribution of multiple carbon sources for denitrification,and the strategy of controlling the dissolved oxygen in the aeration tank at a low level is adopted.When the average mass concentration of influent COD_(Cr),ammonia nitrogen,TP,TN and SS are 254.0,29.30,3.09,31.60 mg/L and 126.3 mg/L,respectively,the average mass concentration of effluent COD_(Cr),ammonia nitrogen,TP,TN and SS are 26.2,0.31,0.23,7.72 mg/L and 5.1 mg/L,respectively.Effluent is steadily up to the highest standards in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918—2002)in the past one year.Moreover,the cost of wastewater treatment is 0.5330 yuan/m^(3),which shows the benefit of the economy and environment.

关 键 词：污水处理厂 低碳氮比 多点进水 溶解氧 MBR工艺 工程设计 

分 类 号：TU992[建筑科学—市政工程]