期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 163, 期 2-3, 页码 869-873出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2008.07.041
关键词
Cr(VI)-reduction; Cr(VI) resistance; Heavy metals; Ochrobactrum sp
资金
- National Natural Science Foundation of China [30400010]
- Chinese Natural Science Foundation For distinguished Group [50621063]
- National Basic Research Program of China [2004CB619204]
A strain CSCr-3 with high Cr(VI)-reducing ability under alkaline conditions was isolated from a chromium landfill and identified as Ochrobactrum sp. on the basis of 16S rRNA gene sequence analysis. The cells were rod shaped, Gram-negative and motile. The physiological characteristics and Cr(VI)-reduction of the strain were also studied. The results showed that the Ochrobactrum sp. strain CSCr-3 was tolerant to very high concentration of Cr(VI) (800 mg/L) and capable of reducing different forms of Cr(VI) (chromate and dichromate), under a wide range of temperatures (25-40 C) and pH (7-11) with optimum at 35 C and initial pH 10. Higher rates of Cr(Vl)-reduction were observed with higher initial cell and Cr(VI) concentrations. Strain CSCr-3 could reduce Cr(VI) very efficiently over a wide range of Cr(VI) concentrations (100-800 mg/L). The addition of glucose caused a dramatic increase in Cr(VI)-reduction by Ochrobactrum sp. CSCr-3, while the presence of sulfate or nitrate had no influence. The presence of other metals, such as Cu, Co, Mn, etc., significantly stimulated Cr(VI)-reduction ability by the strain CSCr-3. The results obtained in this study have significance for the bioremediation of chromate pollution. (C) 2008 Elsevier B.V. All rights reserved.
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