Simultaneous chromium(VI) reduction and phenol degradation in an anaerobic consortium of bacteria
Simultaneous chromium(VI) reduction and phenol degradation in an anaerobic consortium of bacteria
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DOI：
10.1016/s0043-1354(99)00363-2
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发表时间：
2000-06-01
期刊：
影响因子：
12.8
通讯作者：
Wang, YT
中科院分区：
文献类型：
--
作者：
Chirwa, EN;Wang, YT
研究了在补充有 Cr(VI) 还原生物体大肠杆菌 ATCC 33456 的厌氧菌群中同时去除 Cr(VI) 和苯酚的情况。在批量实验之前，大肠杆菌和厌氧苯酚降解菌群培养物均未适应 Cr(VI)。在苯酚浓度为 200 mg/l、初始 Cr(VI) 浓度为 2.0 mg/l 时观察到最佳 Cr(VI) 还原。通过改变铬酸盐、苯酚和苯酚降解剂/E的初始浓度来观察大肠杆菌和苯酚降解剂之间的相互作用。厌氧菌群中的大肠杆菌比率较高的苯酚降解剂/E。大肠杆菌比例导致 Cr(VI) 还原率更高。大肠杆菌利用的每单位重量代谢物观察到的最高累积 Cr(VI) 减少量（1.25 mg Cr(VI)；消耗的 mg 有机酸）接近理论值（1.32 mg Cr(VI)/消耗的 mg 有机酸）。苯酚降解和 Cr(VI) 还原之间存在正相关性，表明大肠杆菌利用苯酚降解形成的代谢物作为 Cr(VI) 还原的电子供体。 (C) 2000 Elsevier Science Ltd. 保留所有权利。
Simultaneous removal of Cr(VI) and phenol was investigated in an anaerobic consortium of bacteria supplemented with a Cr(VI)-reducing organism, Escherichia coli ATCC 33456. Neither E. coli nor the anaerobic phenol-degrading consortium culture was acclimated to Cr(VI) prior to the batch experiments. Optimum Cr(VI) reduction was observed at a phenol concentration of 200 mg/l at an initial Cr(VI) concentration of 2.0 mg/l. The interaction between E. coli and phenol-degraders was observed by varying initial concentrations of chromate, phenol and phenol-degrader/E. coli ratio in the anaerobic consortium Higher phenol-degrader/E. coli ratios resulted in higher rates of Cr(VI) reduction. The highest observed cumulative Cr(VI) reduced per unit weight of metabolite utilized by E. coli (1.25 mg Cr(VI);mg organic acids consumed) approximated the theoretical value (1.32 mg Cr(VI)/mg organic acids consumed). A positive correlation noted between phenol degradation and Cr(VI) reduction indicated that E. coli utilized metabolites formed from phenol degradation as electron donors for Cr(VI) reduction. (C) 2000 Elsevier Science Ltd. All rights reserved.