多级AO+MBR工艺在污水处理厂高排放标准提标改造中的应用  

Application of Multistage AO+MBR Processes in Upgrading and Reconstruction of Stricter Discharge Standard of WWTP

作　　者：姚亮 张强 李鹏 YAO Liang;ZHANG Qiang;LI Peng(Beijing ENFI Environmental Protection Co.,Ltd.,Beijing 100038,China)

机构地区：[1]北京恩菲环保股份有限公司,北京100038

出　　处：《净水技术》2023年第3期164-173,共10页Water Purification Technology

摘　　要：由于排放标准的提高和进水水质的变化,河北省K污水处理厂需进行提标改造,改造后处理规模不变,出水水质满足《大清河流域水污染物排放标准》(DB 13/2795—2018)中的重点控制区排放限值。基于来水中含有部分工业废水、进水水质波动范围大、占地受限等因素,采用了多级AO生物池+膜生物反应器(MBR)工艺;通过对原工艺单元进行充分挖潜利旧,对原连续进水循环式活性污泥(CASS)出水池局部加高增加了总停留时间,改造后的处理工艺运行稳定,满足出水要求,达到提高后的排放标准[COD_(Cr)≤30 mg/L、氨氮≤1.5 mg/L(水温≤12℃时,氨氮≤2.5 mg/L)、总氮≤15 mg/L、总磷≤0.3 mg/L],可为高排放标准下的污水处理厂提标改造提供借鉴经验。Because of the improvement of discharge standards and the change of influent water quality,the K wastewater treatment plant(WWTP)in Hebei Province needs to be upgraded and reconstruction.After upgrading and reconstruction,the treatment capacity is the same as before,and the effluent quality needs to meet the discharge standards of the key control areas in the Discharge Standard of Water Pollution in Daqing River Basin(DB 13/2795—2018).By factors of some industrial wastewater contained in the influent,great fluctuation of water quality and limited land occupation,the multistage AO+membrane bio-reactor(MBR)process is applied in the upgrading and reconstruction.By fully digging the potential of the existed treatment units,the total hydraulic retention time(HRT)is increased by partly heightening the original CASS outlet tank.The effects show that the treatment process after upgrading and reconstruction is stable,effluent water quality can meet the discharge requirements and reach the new standard[COD_(Cr)≤30 mg/L,ammonia nitrogen≤1.5 mg/L(when water temperature is≤12℃,ammonia nitrogen≤2.5 mg/L),TN≤15 mg/L,TP≤0.3 mg/L].These can provide experiences for the upgrading and reconstruction of WWTPs under stricter discharge standard.

关 键 词：脱氮除磷 高排放标准 多级生物处理 提标改造 膜生物反应器(MBR) 

分 类 号：X703[环境科学与工程—环境工程]