Hexavalent chromium reduction by a dichromate-resistant gram-positive bacterium isolated from effluents of tanneries
Hexavalent chromium reduction by a dichromate-resistant gram-positive bacterium isolated from effluents of tanneries
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DOI：
10.1007/s002530050033
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发表时间：
2000-03
影响因子：
5
通讯作者：
A. Shakoori;M. Makhdoom;R. Haq
中科院分区：
文献类型：
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作者：
A. Shakoori;M. Makhdoom;R. Haq
从制革厂废水中分离出革兰氏阳性耐铬菌株（ATCC 700729）。在重铬酸钾浓度高达80 mg ml−1的培养基中生长。通过测定细菌培养前后培养基中Cr VI的含量来检测细菌的重铬酸盐还原能力。研究了培养基pH、Cr浓度、接种量等因素对细菌在不同条件下对培养基中Cr VI的还原能力的影响。在含有重铬酸盐20 mg ml - 1的培养基中，重铬酸盐离子在72小时内还原率超过87%。对该菌株用于工业废水中重铬酸盐脱毒的可行性进行了评价。分离菌株可用于特定的环境清理作业。
A gram-positive, chromium (Cr)-resistant bacterial strain (ATCC 700729) was isolated from effluent of tanneries. It was grown in media containing potassium dichromate concentration up to 80 mg ml−1of the medium. The dichromate reducing capability of the bacterium was checked by estimating the amount of Cr VI in the medium before and after introduction of bacterial culture. The influence of factors like pH of the medium, concentration of Cr, and the amount of the inoculum was studied to determine the ability of the bacterium to reduce Cr VI in the medium under various conditions. In a medium containing dichromate 20 mg ml−1more than 87% reduction of dichromate ions was achieved within 72 h. The feasibility of the use of this bacterial strain for detoxification of dichromate in the industrial wastewater has been assessed. The isolated strain can be exploited for specific environmental clean-up operations.