AO与AAO工艺去除雌激素效能对比及分析

Comparison and analysis of estrogen removal efficiency in AO and AAO processes

为探讨不同污水处理工艺对雌激素类有机物的处理效能,本研究设计并同时运行了AO和AAO两种污水处理工艺,在稳定运行条件下,比较了两种工艺对各种常规水质指标和雌激素的去除状况.试验结果表明,AAO系统对污染物去除效能明显优于AO系统.AAO对COD、TN、NH4+-N、TP及TOC的去除效能分别比AO高出7.55%、20.90%、5.87%、21.25%和3.96%;AAO工艺对所选择的3种雌激素E1、E2、EE2的去除率分别为86.40%、92.30%和73.60%,分别比AO工艺高出30.69%、19.70%和36.33%,相比而言,AAO的去除效果更好.分析表明,E2和E1的去除主要是生物降解和污泥吸附的作用结果,而EE2主要是通过污泥的吸附作用被去除;AAO对雌二醇当量(Estradiol Equivalent Quantity,EEQ)的衰减率比AO高出22.59%,化学计算的EEQcal比实际生物测得的EEQmeas要高,其比值为1.57±0.62.雌激素活性的生物评价是其化学分析的重要补充.

For investigating the removal efficiency of estrogenic organic compounds in different wastewater treatment process,AO and AAO processes were designed and conducted simultaneously to compare the removal status of the various conventional water quality indexes and estrogen at the stable operating conditions in this study. The results indicated that the pollutant removal efficiency of AAO process was markedly better than the AO process. The removal efficiency of COD,TN,NH4^＋-N,TP and TOC in AAO system was higher than AO system for 7.55%,20.90%,5.87%,21.25% and 3.96%,respectively; The removal efficiency of all the three selected estrogens （E1,E2 and EE2） were 86.40%,92.30% and 73.60%,respectively,which were higher than AO process for 30.69%,19.70% and 36.33%. By comparison,the efficiency of AAO was much better. Analysis indicated that E2 and E1 was mainly removed by the biodegradation and adsorption of the sludge,while EE2 was mainly removed by the sludge adsorption. The decay rate of EEQ in AAO process was higher than AO process for 22.59%. The EEQ calculated from the estrogen concentration was higher than the EEQ determined by the yeast estrogen screen,and the ratio of them was 1.57±0.62. The estrogenicity measured by YES assay was important complementarity for estrogen chemical analysis.