PAC-MBR组合工艺处理城市污水

POWDER ACTIVATED CARBON-MEMBRANE BIOREACTOR FOR TREATMENT OF MUNICIPAL WASTEWATER

采用PAC-MBR组合工艺处理城市污水,考察了该工艺对COD、NH4+-N和浊度的去除效果,试验结果表明,在水温>26℃、DO>4.5mg/L及pH为6～9的条件下,组合工艺对COD、NH4+-N和浊度的去除效果较好,平均去除率分别达到88%、98%和98%以上,高于单独MBR工艺和常规工艺。出水COD约为22mg/L,NH4+-N<1mg/L,浊度<1NTU,水质优于中国建设部生活杂用水水质标准(CJ25.1-89)。已污染的膜可通过水反冲洗、水-酸洗、水-碱洗使膜通量恢复至新膜的43%、81%、89%。

The combined process of powdered activated carbon(PAC)and membrane bioreactor(MBR)was applied for treatment of municipal wastewater.The removal efficiencies of COD,NH+4-N and turbidity in the combined process were investigated.The result showed that the combined process may achieve better removal efficiencies of COD,NH+4-N and turbidity,when water temperature is above 26℃,DO is above 4.5 mg/L and pH is between 6 and 9.The average removal efficiencies of COD,NH+4-N and turbidity in the combined process were 88%,98% and 98% respectively,and was better than that of single MBR process and conventional process.The effluent COD was less than 22 mg/L and NH+4-N was less than 1 mg/L,turbidity was less than 1NTU.It was better than that of water for domestic reuse stated by the Ministy of Construction(CJ25.1-89).The fouled membrane was cleaned by water rinsing,water-acid rinsing,water-alkali rinsing,which can let its flux be restored to 43%,81%,89% of a new membrane respectively.