污染控制技术及原理
邓荣,柴立元,王云燕.外控电势对Ch-1菌株生长及Cr(Ⅵ)还原的影响[J].环境科学学报,2006,26(7):1116-1121
外控电势对Ch-1菌株生长及Cr(Ⅵ)还原的影响
- Effect of the applied potential on the growth of Ch-1 bacteria and the hexavalent chromium's reduction
- 基金项目：国家自然科学基金(No.20477059);教育部高等学校博士学科点专项科研基金(No.20040533048)
- 作者
- 单位
- 邓荣
- 中南大学冶金科学与工程学院, 长沙 410083
- 柴立元
- 中南大学冶金科学与工程学院, 长沙 410083
- 王云燕
- 中南大学冶金科学与工程学院, 长沙 410083
- 摘要：为进一步优化Ch-1菌株对碱性含铬废水的处理及铬渣的解毒效果,以细菌总数和6价铬的还原率为指标,详细考察了外控电位对Ch-1菌株生长及Cr(Ⅵ)还原的影响.结果表明,电极材料对细菌生长及其活性有一定的影响,不锈钢电极和铂电极体系对细菌生长及活性的影响基本相同,而采用石墨电极细菌的培养效果欠佳.静态培养和动态培养Ch-1菌株时,Cr(Ⅵ)的最终还原率与初始Cr(Ⅵ)浓度无关,24h时Cr(Ⅵ)的还原率均达到了100%;但就还原过程而言,动态培养对Cr(Ⅵ)的还原速率明显优于静态培养,外控电势能够增强或抑制Ch-1菌株的生长及活性,0～-900mV的负电位可以促进细菌的生长,而400mV以上的正电势对Ch-1菌株的生长有抑制作用.在-800+200mV的电势范围内,Ch-1菌株还原6价铬的能力得到增强,在此范围外其还原能力受到抑制.
- Abstract：In order to optimise the efficiency of Ch-1 bacteria on treatment of chromium-containing wastewater and detoxification of chromium-contained slag further, the growth and activity of the bacteria and the reduction rate of Cr(VI) under the applied potential were studied with total count of bacteria and the process of hexavalent chromium's reduction as indexes. The results indicate that electrode materials have some effect on the growth and activity of the bacteria in certain cases., The effect of stainless steel electrode and platinum electrode on the growth and activity of the bacteria are essentially same, but graphite electrode can not work as well for cultivating Ch-1 bacterial. There is no relationship between original Cr(Ⅵ) concentration and final reduction rate of Cr(Ⅵ) treated by the bacteria cultivated in static and dynamic state respectively When Ch-1 bacteria was cultivated for 24h, the reduction rate reaches 100%. However, as far as reduction process concerned, reduction rate of Cr(Ⅵ) by Ch-1 bacteria cultivated in dynamic state is distinctly excellent than the one in static state. The applied potential has both-side effect on (enhances or restrains) the growth and activity of Ch-1 bacteria. Under the applied potential of 0mV～-900mV, the growth of bacteria is increased, and the growth of Ch-1 bacteria is restrained above +400mV. Under the applied potential of -800mV～+200mV, the ability of Ch-1 bacteria for reducing hexavalent chromium is enhanced, outside the range the ability is restrained.
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