Aerobic batch degradation of 17-β estradiol (E2) by activated sludge:: Effects of spiking E2 concentrations, MLVSS, and temperatures
Aerobic batch degradation of 17-β estradiol (E2) by activated sludge:: Effects of spiking E2 concentrations, MLVSS, and temperatures
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DOI：
10.1016/j.watres.2005.02.009
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发表时间：
2005-05-01
期刊：
影响因子：
12.8
通讯作者：
Mathews, AP
中科院分区：
文献类型：
--
作者：
Li, FS;Yuasa, A;Mathews, AP
研究了污水处理厂活性污泥中17 β雌二醇（E2）的好氧分批降解，考察了E2初始浓度（C-0）、微生物种群密度（MLVSS）和温度（TEMPT）对这三个因素的各种组合的可能影响：C-0 = 10、30和50 μ g l（-1）; MLVSS = 1750、875和435 mg l（-1）; TEMPT = 5、20和35 ℃。的结果，连同那些通过两个控制运行使用杀死的污泥样品进行，清楚地表明，E2从水相容易地消除在适当的MLVSS和温度水平下，与生物质的吸附作用不太显着。通过将观察到的浓度数据与一阶速率表达式拟合，估计了所有实验条件下的降解速率常数（kappa）。Kappa值在0.23- 4.79h（-1）范围内变化显著，其变化规律为MLVSS越大，速率常数越大，温度越高，速率常数越大。生物质改性的平均速率常数（kappa '）随温度的升高也呈现出明显的增加趋势：在5、20和35 ℃时的kappa'值分别为0.79、1.77和3.291 MLVSS g（-1）h（-1）。此外，基于估计的kappa值，确定在5-20和20-35摄氏度范围内的温度系数（θ）。与报道的生活污水中普通BOD有机基质的theta值相似，E2的theta值在1.026-1.09范围内变化，表明温度对E2和BOD成分降解速率的影响可能相似。(c)2005爱思唯尔有限公司保留所有权利。
Aerobic batch degradation of 17 beta estradiol (E2) spiked into the activated sludge liquor from a sewage treatment plant was studied; and the likely impacts of E2's initial concentrations (C-0), microbial population densities (MLVSS) and temperatures (TEMPT) were examined for a variety of combinations of these three factors: C-0 = 10, 30 and 50 mu g l(-1); MLVSS = 1750, 875 and 435 mg l(-1); and TEMPT = 5, 20 and 35 degrees C. The results, together with those obtained through two-control runs performed using a killed sludge sample, demonstrated clearly that E2 was eliminated from the aqueous phase readily under appropriate MLVSS and temperature levels, with the role of sorption by biomass being less significant. By fitting observed concentration data with a first-order rate expression, the degradation rate constants (kappa) under all experimental conditions were estimated. The magnitude of kappa changed markedly in the range of 0.23-4.79 h(-1), following a general order that the higher the MLVSS was, the higher the rate constant, and that the higher the temperature, the higher the rate constant. An obvious increasing trend of the biomass-modified average rate constant (kappa') with increases in the temperature was also presented: the kappa' values at 5, 20 and 35 degrees C were 0.79, 1.77 and 3.291 MLVSS g(-1) h(-1), respectively. Furthermore, based upon the estimated kappa values, the temperature coefficients (theta) over the ranges of 5-20 and 20-35 degrees C were determined. In similarity with the magnitude of theta reported for ordinary BOD-based organic matrices in domestic wastewater, the theta values of E2 varied in the range of 1.026-1.09, suggesting that the temperature impacts on the degradation rates of E2 and BOD constituents are probably similar. (c) 2005 Elsevier Ltd. All rights reserved.