A2/O—膜生物反应器组合工艺去除典型内分泌干扰物的特性研究

摘要

以环境水体中21种典型内分泌干扰物(EDCs)为目标物,对其在某城市污水处理厂A2/O—膜生物反应器(MBR)组合工艺中的去除特性和行为归趋进行了长期研究.结果表明:21种EDCs在该组合工艺进水中,己烷雌酚(HES)质量浓度最小(4.6ng/L),双酚A(BPA)质量浓度最大(219.1 ng/L);出水中HES质量浓度最小(0.2 ng/L),BPA质量浓度最大(6.7 ng/L).该组合工艺对21种EDCs有很强的去除能力,除己烯雌酚(DES)、双烯雌酚(DIES)、壬基酚(4-n-NP)和辛基酚(4-OP)的去除率分别为85.1％、84.9％、77.1％、75.8％外,其余EDCs的去除率均在95％以上.EDCs在A2/O—MBR组合工艺中泥水两相的迁移行为可用泥-水分配系数(Kd)表征,21种EDCs的Kd均较高,表明污泥对EDCs有一定的吸附作用,大部分EDCs是通过污泥吸附去除.%Removal characteristics and behavior of 21 typical endocrine disrupting compounds (EDCs) in A2/O-membrane bioreaetor (MBR) combined process were investigated in a municipal treatment plant.The concentrations of EDCs ranged from 4.6 ng/L (HES) to 219.1 ng/L (BPA) in the influent,and from 0.2 ng/L (HES) to 6.7 ng/L (BPA) in the effluent.These results indicated the removal performance of A2/O-MBR combined process for EDCs was excellent.The removal efficiencies of EDCs reached above 95 ％,except for DES (85.1 ％),DIES (84.9 ％),4-n-NP (77.1 ％) and 4-OP (75.8 ％).The migration behavior of EDCs in the A2/O-MBR combined process was characterized by soid-water distribution coefficient (Kd).The high Kd values indicated that the sludge had a large adsorption capacity for these EDCs,and significantly contributed to removal of EDCs.