华北地区某污水处理厂升级改造工程实例

Example of an upgrading project of sewage treatment plants in North China

华北地区某城市污水处理厂升级改造工程处理规模为50万t/d,原设计为A/O脱氮工艺,执行《城镇污水处理厂污染物排放标准》(GB 18918-2002)二级排放标准。由于近年来进水水质严重恶化以及对污水排放标准的提高,需对原污水处理系统进行改造,通过技术方案对比,在原生物处理段增加厌氧池,使之变为A2/O脱氮除磷,新增深度处理工艺为反硝化生物滤池-加砂沉淀池-滤布滤池-紫外消毒,使出水水质达到一级A排放标准。

There is an upgrading project of sewage treatment plants with processing scale of 5×105 t/d in North China.The original design is to use A/O denitrification process,abiding by the secondary emission standard of the implementation of the urban sewage treatment plant pollutant discharge standard（GB 18918-2002）.Due to feed water quality deterioration and the improvement of sewage discharge standard the in recent years,the original sewage treatment system needs to be improved.Through technical comparison,anaerobic pool is adopted in the original biological treatment process,resulting in A2/O denitrification and dephosphorization,and the added depth treatment technology is of denitrifying biological filter-sand tank-filter cloth filter-ultraviolet disinfection in order.The effluent quality reaches discharge standard A.