雌酮、17β-雌二醇及双酚A在A^2O/MBR中试装置的去除

Removal of Estrone,17β-Estradiol and Bisphenol A in a Pilot-Scale A^2O/MBR System

雌酮(E1)、17β-雌二醇(E2)及双酚A(BPA)是一类重要的内分泌干扰物,对水生生物具有内分泌干扰作用,E1、E2和BPA在污水处理系统中能否有效去除已经成为当前研究的关注点。采集A2O/MBR污水处理中试装置各工段的污水样品,经过HLB柱富集之后,利用LC-MS/MS分析上述三种目标化合物。研究结果表明,E1、E2和BPA的去除率分别为96.13%～100%、100%、93.1%～100%,A2O/MBR中试装置在高低进水负荷条件下均能有效去除三种目标物。在高低负荷条件下COD、NH4+、TP等常规指标去除率也均在91%以上。E1、E2和BPA在中试装置各工段的浓度沿程逐渐降低,其中厌氧段下降最明显,MBR装置对于A2O/MBR整个组合工艺流程雌激素的去除具有显著的贡献,而且系统进水负荷越高,MBR装置对三种目标化合物去除的贡献率越高。A2O/MBR组合工艺既能抵抗冲击负荷,又能强化对污水中痕量有机物及氮磷等常规指标的去除,因而A2O/MBR组合工艺对于污水处理系统中雌激素类物质的深度处理具有应用前景。

Estrone(E1) , 17β-estradiol(E2) and bisphenol A(BPA) are important endocrine disrupters(EDCs) because of their endocrine disrupting effects to aquatic organisms. Efficient removal of the three EDCs from wastewater in wastewater treatment systems has received lots of attention in recent years. This study examined the removal of the three EDCs in a pilot-scale A2O/MBR system. The water samples were enriched by HLB column and analyzed by LCMS/MS. The results revealed that the removal efficiency of E1, E2 and BPA reached 96.13%～100%, 100% and 93.1%～100%, respectively. The three EDCs were effectively removed in the A2O/MBR system at both high and low influent loading rates. Meanwhile, the removal efficiency of COD, NH4+ , and TP were all over 91%. It was found that the concentrations of the three compounds were gradually decreased along the treatment process, especially in anaerobic tanks. MBR had a significant contribution to the removals of the three EDCs and its contribution became more significant at higher influent loading rates. The results showed that the A2O/MBR system could not only tolerate the varied influent loading rates, but also could enhance the removal of EDCs. Therefore, this process would have a broad application prospect in the advanced treatment of estrogens in wastewater treatment system.