两种工艺对污水再生水中微量有机物的去除效果

以20种微量有机污染物为目标物,针对北京市2个再生水厂的不同工艺,系统地考察了污水再生水中目标化合物的去除效果,并采用重组酵母雌激素活性筛检法(YES法)对再生水中雌激素活性进行评价.结果表明,超滤(UF)+臭氧(O3)氧化处理工艺可有效地去除微量有机污染物,出水中雌二醇当量浓度(EEQ)低于YES法检出范围.A2/O+膜生物反应器(MBR)+反渗透(RO)处理工艺对微量有机污染物有很高的去除能力,出水中可检测出的目标化合物较少.2种工艺均可降低再生水的环境风险,保障其使用安全.

Removal efficiencies of organic micropollutants in wastewater-based reclaimed water by two different treatment processes

Removal efficiencies of organic micropollutants in wastewater-based reclaimed water by two water reclamation plants (WRPs) with different treatment processes in Beijing,China were investigated. Target compounds consisted of twenty kinds of micropollutants belonging to different groups. Besides, the estrogenicity of samples were evaluated by modified recombinant yeast estrogen screen (YES). The process of ozonation combined with ultrafiltration (UF) could be considerably effective to remove organic micropollutants from aqueous phase, and estradiol equivalent (EEQ) in the final effluent was not detected by YES assay. In addition, the process of reverse osmosis (RO) following anaerobic/anoxic/oxic and membrane bioreactor (MBR) showed such high removal efficiencies of target compounds that few of them could be detected in the final effluent. The results indicated that the two processes could alleviate the potential environmental risk caused by reclaimed water, and guarantee their safe and healthy reuse.