一株铁还原菌的分离及其碳源利用特性研究

第39卷第4期

2016年4月合肥工业大学学报(自然科学版)JOURNAL OF HEFEI UNIVERSITY OF T ECHNOLOGY Vol .39No .4 Apr .2016 收稿日期:2015-01-04;修回日期:2015-03-04

基金项目:环保部公益性行业科研专项经费资助项目(201009041-03)

作者简介:童 磊(1988-),男,安徽芜湖人,合肥工业大学硕士生;

袁 峰(1971-),男,广西桂林人,博士,合肥工业大学教授,博士生导师;

周涛发(1964-),男,安徽庐江人,博士,合肥工业大学教授,博士生导师.doi :10.3969/j .issn .1003-5060.2016.04.021

一株铁还原菌的分离及其碳源利用特性研究

童 磊, 李湘凌, 吴纪南, 袁 峰, 周涛发

(合肥工业大学资源与环境工程学院,安徽合肥 230009)

摘 要:文章探究从污水处理厂污泥中筛选的一株铁还原菌的生长特性,研究不同碳源对Fe (Ⅲ)还原的影响。结果表明:此株铁还原菌株适宜的生长条件为p H =7、温度为35℃、黑暗条件;碳源类型和浓度显著影响菌株的铁还原能力,其最适碳源浓度为1.5mol /L ,以蔗糖、葡萄糖、丙酮酸钠、乙酸钠、乳酸钠为碳源时,其Fe (Ⅲ)还原率依次降低,以蔗糖和葡萄糖为碳源时Fe (Ⅲ)还原率分别为81.0%和57.2%;Fe (Ⅲ)还原过程

中脱氢酶活性与Fe (Ⅲ)还原率显著正相关,脱氢酶活性能在一定程度上反映Fe (Ⅲ)还原程度。

关键词:铁还原菌;碳源;脱氢酶活性

中图分类号:X 172 文献标识码:A 文章编号:1003-5060(2016)04-0536-07Isolationofaniron-reducingbacteriastrainanditscarbonsourceutilization

T ONG Lei , LI Xiang -ling , WU Ji -nan , YU AN Feng , ZHOU Tao -fa

(School of Resources and Environmental Engineering ,Hefei U niversity of T echnology ,Hefei 230009,China )Abstract:An iron -reducing bacteria strain was isolated from municipal sewage sludge .The characteristics of the bacteria strain and the influence of carbon sources on the Fe (Ⅲ)reduction were studied .The results showed that the strain grew best when pH value was 7and the temperature was 35℃under the darkness condition .The iron reduction ability of the bacteria strain was significantly influenced by the type and the con -centration of carbon source .The optimum concentration of the carbon source was 1.5mol /L .When sucrose ,g lucose ,sodium pyruvate ,sodium acetate ,sodium lactate were serviced as carbon sources respectively ,Fe (Ⅲ)reduction rate of the strain reduced in turn .When sucrose and glucose were used as carbon sources ,Fe (Ⅲ)reduction rate of the strain was 81.0%and 57.2%respectively .There was a significant positive correla -tion between the dehydrogenase activity of the strain and Fe (Ⅲ)reduction rate .Dehydrogenase activity could reflect the Fe (Ⅲ)reduction degree .Keywords:iron -reducing bacteria ;carbon source ;dehydrogenase activity

异化铁还原是铁还原菌介导进行的Fe (Ⅲ)

还原,该过程广泛地存在于自然界的厌氧环境[1]。

在异化铁还原过程中铁还原菌不仅以简单有机物

等为电子供体,而且可以偶联难降解有机污染物

氧化分解及重金属还原等,因而铁异化还原对环

境污染修复具有重要的意义[2-3]。在异化铁还原

相关研究中,高效铁还原菌的分离纯化工作是研

究异化铁还原过程的基础,也是利用铁还原菌开展污染修复的基础。迄今,研究人员从各种厌氧环境中分离得到了不同的异化Fe (Ⅲ)还原菌,这些Fe (Ⅲ)还原菌可利用的电子供体包括了纤维素、糖类、氨基酸、氢气和有机酸等[3],如其中研究最为广泛和系统的Geobacter和Shewanella分别以乙酸盐和乳酸盐、丙酮酸盐为电子供体[4-5]。而微生物对碳源要求的单一性会极大地限制微生物在环境污染修复中应用。因此,研究并探明不同

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