Aclidogenic sequencing batch reactor start-up procedures for induction of 2,4,6-trichlorophenol dechlorination
Aclidogenic sequencing batch reactor start-up procedures for induction of 2,4,6-trichlorophenol dechlorination
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DOI：
10.1016/j.watres.2007.10.019
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发表时间：
2008-03-01
期刊：
影响因子：
12.8
通讯作者：
He, Jianzhong
中科院分区：
文献类型：
--
作者：
Mun, Cheok Hong;Ng, Wun Jern;He, Jianzhong
通过控制产酸序批式反应器（SBR）的启动过程，成功地将2，4，6-三氯苯酚在产酸条件（pH 5.6-6.5）下脱氯为4-氯苯酚。启动过程中pH值从中性逐步降低到酸性是诱导脱氯的关键。一旦被诱导，脱氯可以在低至5.6的pH下进行，然后才发生抑制。最大脱氯速率的最佳pH值范围为6.0至6.3。高初级（蔗糖），二级（2，4，6-三氯苯酚）底物比例未能诱导脱氯。相反，脱氯发生在初级与次级基质的比例小于103 M/M时。一个特定的最大三氯苯酚负荷率为60 μ mol/g MLVSS d之前，抑制出现与产酸反应器故障的发病。T-RFLP图谱分析提供的证据表明，启动程序导致选择了适当的微生物群落，从而导致成功开发了能够降解2，4，6-三氯苯酚的产酸联合体。(c)2007爱思唯尔有限公司保留所有权利。
Dechlorination of 2,4,6-trichlorophenol to 4-chlorophenol under acidogenic conditions (pH 5.6-6.5) was successfully induced by manipulating the start-up procedure of an acidogenic sequencing batch reactor (SBR). A stepwise pH reduction from neutral to acidic level during start-up was crucial for inducing dechlorination. Once induced, dechlorination can proceed at pH as low as 5.6 before inhibition occurrs. Optimum pH for maximum dechlorination rate ranged from 6.0 to 6.3. High primary (sucrose) to secondary (2,4,6-trichlorophenol) substrate ratio failed to induce dechlorination. Instead, dechlorination occurred at primary to secondary substrate ratios of less than 103 M/M. A specific maximum trichlorophenol loading rate of 60 mu mol/g MLVSS d was achieved before inhibition appeared with onset of acidogenic reactor failure. T-RFLP profile analysis gave evidence that the start-up procedure resulted in the selection of an appropriate microbial community, which resulted in the successful development of an acidogenic consortium capable of degrading 2,4,6-trichlorophenol. (c) 2007 Elsevier Ltd. All rights reserved.