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首页> 外文期刊>African Journal of Biotechnology >Predictive approach for simultaneous biosorption of hexavalent chromium and pentachlorophenol degradation by Bacillus cereus RMLAU1
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Predictive approach for simultaneous biosorption of hexavalent chromium and pentachlorophenol degradation by Bacillus cereus RMLAU1

机译：蜡状芽孢杆菌RMLAU1同时降解六价铬和五氯苯酚的生物吸附的预测方法

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摘要

Chromium and pentachlorophenol are the major environmental pollutants emanating from tannery effluent. Indigenous?Bacillus cereus?isolate was employed for biosorption and PCP degradation studies under varied environmental conditions such as pH, temperature, contact time, presence of other heavy metals, initial biosorbent and Cr6+?concentrations. Best results for Cr6+?biosorption (% removal) by living and dead biomass at 2.0 g l-1?were found to be 35.2 mg Cr g-1?dry wt (63%) at pH 5.0, and 42.5 mg Cr g-1?dry wt (70.5%) at pH 4.0, respectively at 35oC (150 rpm) during 120 min at an initial concentration of 200 mg Cr6+?l-1?and 500 mg PCP l-1. Among various factors, pH had profound effect on Cr6+?biosorption and PCP degradation. Maximum 7.5 % (w/v) PCP degradation ensued in 2 h only by live cells in the presence of 0.4 % (w/v) cometabolite glucose. Presumably, this is the first report on simultaneous biosorption of chromium and pentachlorophenol remediation by native?Bacillus cereus?isolate from tannery effluent. Statistical regressional analysis suitably validated the experimental findings. This strain would be helpful in eco-friendly simultaneous bioremediation allied with a predictive computational approach.
机译：铬和五氯苯酚是制革厂废水中主要的环境污染物。在不同的环境条件下，如pH，温度，接触时间，其他重金属的存在，初始生物吸附剂和Cr6 +？的浓度，使用蜡状芽孢杆菌分离物进行生物吸附和PCP降解。发现在2.0 g l-1？下通过活和死生物质进行Cr6 +？生物吸附（去除率％）的最佳结果是在pH 5.0时为35.2 mg Cr g-1→干重（63％）和42.5 mg Cr g-1初始浓度为200 mg Cr6 +η1-1和500 mg PCP 1-1时，在pH值为4.0的条件下，分别在35 oC（150 rpm）和120°C下干燥重量（70.5％）。在各种因素中，pH对Cr6 +？的生物吸附和PCP降解具有深远的影响。仅在存在0.4％（w / v）的代谢物葡萄糖的情况下，活细胞在2小时内产生的最大PCP降解为7.5％（w / v）。据推测，这是关于制革厂废水中天然蜡状芽孢杆菌分离物同时吸附铬和五氯苯酚的生物吸附研究的首次报道。统计回归分析适当地验证了实验结果。该菌株将有助于通过预测性计算方法联合进行生态友好的同时生物修复。

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