Characterization of Five Chromium-Removing Bacteria Isolated from Chromium-Contaminated Soil

被引：30
作者：
He, Zhiguo [1 ,2 ]
Li, Shuzhen [1 ,2 ]
Wang, Lisha [1 ,2 ]
Zhong, Hui [3 ]
机构：
[1] Cent South Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China
[2] Cent South Univ, Minist Educ, Key Lab Biohydromet, Changsha 410083, Hunan, Peoples R China
[3] Cent South Univ, Sch Life Sci, Changsha 410012, Hunan, Peoples R China
来源：
WATER AIR AND SOIL POLLUTION | 2014年 / 225卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Chromium-removing bacteria; Pseudochrobactrum saccharolyticum; Aerobic process; Biotransformations; Bioremediation; Waste treatment; EXTRACELLULAR POLYMERIC SUBSTANCES; HEXAVALENT CHROMIUM; CHROMATE REDUCTION; SP NOV; BINDING-CAPACITY; CR(VI) REDUCTION; RESISTANT; SITES; DIVERSITY; COMMUNITY;
D O I：
10.1007/s11270-014-1904-2
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The potential for bioremediation of chromium pollution using bacteria was investigated in this study. Five chromium-removing bacteria strains were successfully isolated from Cr(VI) contaminated soils and identified by their 16S rRNA gene sequences. The optimum growth temperature (30-40 degrees C) and pH (8.5-11) for the five isolates were investigated. The effect of initial Cr(VI) concentrations (0-1,575 mg L (1)) on bacterial growth was also studied. Results showed that Pseudochrobactrum saccharolyticum strain W1 had high chromium-removing ability and could grow at Cr(VI) concentrations from 0 to 1,225 mg L-1. To our knowledge, this is the first report of chromium removal by a member of the Pseudochrobactrum genus. Sporosarcina saromensis W5 had the highest chromium-removing rate of 0.79 mg h(-1) mg(-1) biomass. Exopolysaccharide (EPS) production and components of the five bacteria strains were also investigated, and a positive relationship was found between the bacterial chromium removal and EPS production.
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页数：10
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