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AEROBIC BIODEGRADATION KINETICS OF 17 beta-ESTRADIOL IN ACTIVATED SLUDGE: INFLUENCE FACTORS AND METABOLIC PRODUCTS PREDICTION

文献类型： 外文期刊

作者： Zhang, Zhaohan 1 ; Zou, Qiuyan 1 ; Xiang, Lijun 1 ; Lin, Nan 1 ; Gao, Peng 1 ; Zhan, Peirong 2 ; Feng, Yujie 1 ; Ren, Nan 1 ;

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： Aerobic biodegradation;17 beta-estradiol;MLVSS;Temperature coefficient;Metabolic products

期刊名称：FRESENIUS ENVIRONMENTAL BULLETIN （ 影响因子：0.489； 五年影响因子：0.479 ）

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收录情况： SCI

摘要： The aerobic biodegradation of 17 beta-estradiol (E-2) in activated sludge was investigated to assess the function of biodegradation on E-2 removal in biological treatment system. The results indicated that all experimental data could be well fitted by Michaelis- Menten Model and the degradation rates of E-2 (k) in activated sludge were obviously affected by initial E-2 concentrations, MLVSS and temperatures. The k values had a positive linear relation with InC0, indicating that E-2 was used by microorganism more effectively at higher initial concentration. It varied in the range of 0.716-9.117 h(-1) at different MLVSS and temperatures, following a general law that the higher the MLVSS and temperatures were, the higher the degradation rate constants would be obtained. The average degradation rates on the basis of MLVSS (k') increased from 1.43 to 2.54 and 3.93 h(-1)/(g/L-MLVSS) with temperature increasing from 5 to 20 and 35 degrees C, while the temperature coefficient in the range of 5-20 and 20-35 degrees C were calculated as 1.039 and 1.029, respectively. Estrone (E-1) was the main metabolite in E-2 degradation, with the degradation rates of only 0.58-1.38% of E-2 at the same condition. The consecutive first-order kinetics was constructed to model the E-2 degradation and predict metabolite E-1 accumulation, which fitted the measured data well. The results will improve our understanding on the environmental fate and ecological risks of estrogens in the sewage biological treatment system.

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