某多晶硅厂生活污水再生处理工程实例

Project case of the treatment and reusing of domestic sewage in a polysilicon plant

某多晶硅厂采用A/O生物接触氧化法处理生活污水,联合后续的混凝沉淀和过滤工艺,主要污染物COD、BOD、NH3-N、SS分别降至50、10、10、10 mg/L以下,达到《城市污水再生利用城市杂用水水质》(GB/T 18920—2002)要求。出水用于厂区的景观水池、绿化、冲厕等。该厂平均每月回用中水约9 500 m3,可节省水费约4.43万元。系统通过PLC、在线仪表实时监控水质,其操作方便、运行稳定,具有明显的经济效益和环境效益。

The A/O bio-contact oxidation process has been used for treating the domestic sewage in a polysilicon plant. Combined with the subsequent coagulation sedimentation and filtration processes,the concentrations of main pollutants,such as COD,BOD,NH3-N and SS can be decreased to lower than 50,10,10,10 mg/L,respectively,reaching the Reuse of Urhan Recycling Water—Quality Standard of Urban Miscellaneous Water Consumption（GB/T18920—2002）. The effluent can be used in landscape ponds,greenbelts,flushing toilets,etc. in the plant area. The amount of reclaimed water is about 9 500 m3 a month,i.e. CNY44 300 of water cost can averagely be saved every month. The water quality is real-time monitored and controlled through the PLC and online instruments. The system is characterized by simple operation and stable running,having obvious economic and environmental benefits.