长江中下游某Unitank污水处理厂去除雌激素的效果分析

REMOVAL OF STEROID ESTROGENS IN A MUNICIPAL SEWAGE TREATMENT PLANT WITH UNITANK PROCESS IN THE MIDDLE AND LOWER REACHES OF YANGTZE RIVER REGION

以长江中下游地区某实际运行的Unitank污水处理厂为研究对象,跟踪监测了其进、出水类固醇雌激素(SE)的浓度水平,考察了雌激素去除效果随时间的变化规律,并分析了不同处理工段对雌激素去除的贡献。结果表明:污水厂进水中雌酮(E1)、17β-雌二醇(E2)、17α-乙炔基雌二醇(EE2)的浓度分别为32.4～89.0,19.4～78.0和12.3～45.0 ng/L,且夏季浓度高于冬季;Unitank工艺对E1、E2、EE2的去除率分别为21.3%～77.0%,23.4%～73.5%和25.2%～68.1%。SE去除主要依靠好氧生物降解实现,物理沉降(沉砂或沉淀)对SE的去除贡献较小。温度是影响SE去除的重要因素之一,较高的温度有利于SE的去除。

The occurrence of steroid estrogens（SE） in the influents and effluents of a real municipal wastewater treatment plant（MWTP） with Unitank process in the middle and lower reaches of the Yangtze River region has been monitored.The variation of SE removal over time was revealed.The contribution of different sections of the MWTP to SE removal was analyzed.Results show that SE concentrations in the influents were found to be 32.4~89.0 ng/L for E1,19.4~78.0 ng/L for E2,and 12.3~45.0 ng/L for EE2,respectively.SE concentrations in the influents were significantly higher in summer than that in winter.The removal rates of E1,E2,and EE2 varied from 21.3% to 77.0%,23.4% to 73.5%,and 25.2% to 68.1%.It is revealed that SE removal mainly occurred in the aeration tank by biodegradation,while the contribution of precipitation（grit chamber and sedimentation tank） was limited.Temperature was one of the essential factors,affecting the SE removal,and high temperature was beneficial for SE removal.