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Influence of operating parameters on the fate and removal of three estrogens in a laboratory-scale AAO system

文献类型： 外文期刊

作者： Zhang, Zhaohan 1 ; Feng, Yujie 1 ; Su, Hui 1 ; Xiang, Lijun 1 ; Zou, Qiuyan 1 ; Gao, Peng 1 ; Zhan, Peirong 2 ;

作者机构： 1.Harbin Inst Technol, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China

2.Chinese Acad Fishery Sci, Heilongjiang River Fisheries Res Inst, Harbin 150001, Peoples R China

关键词： anaerobic-anoxic-oxic (AAO) process;estrogens;hydraulic residence time (HRT);removal mechanisms;sludge retention time (SRT)

期刊名称：WATER SCIENCE AND TECHNOLOGY （ 影响因子：1.915； 五年影响因子：2.054 ）

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收录情况： SCI

摘要： A laboratory-scale anaerobic-anoxic-oxic (AAO) process was constructed to investigate the influence of hydraulic residence time (HRT) and sludge retention time (SRT) on the removal and fate of estrone (E1), 17 beta-estradiol (E-2) and 17 alpha-ethinylestradiol (EE2), and their removal mechanisms in a biological treatment system. In an HRT range of 5-15 h, the highest removal efficiencies for E-1, E-2 and EE2 were obtained at an HRT of 8 h, with values of 91.2, 94.6 and 81.5%, respectively. When the SRT was increased from 10 to 20 d, all three estrogen removal efficiencies stayed above 80%, while the optimal SRT for each estrogen was different. The contribution of each tank for removal of the three estrogens was in the order of aerobic tank > anoxic tank > anaerobic tank. The optimal HRT and SRT for the removal of both the three estrogens and nutrients were 8 h and 15d, respectively. At this condition, respectively, about 50.7, 70.1 and 11.3% of E-1, E-2 and EE2 were biodegraded, 28.8, 17.2 and 50% were accumulated in the system, 8.3, 5.4 and 17.3% were discharged in the effluent, and 12.2, 7.3 and 20.34% were transported into excess sludge. It indicated that biodegradation by sludge microorganisms was the main removal mechanism of E-1 and E-2, while adsorption onto sludge was the main mechanism for EE2 removal.

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