Cr(VI) reduction by Bacillus coagulans isolated from contaminated soils
Cr(VI) reduction by Bacillus coagulans isolated from contaminated soils
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DOI：
10.1061/(asce)0733-9372(1998)124:12(1165
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发表时间：
1998-12
期刊：
影响因子：
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通讯作者：
L. Philip;L. Iyengar;C. Venkobachar
中科院分区：
文献类型：
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作者：
L. Philip;L. Iyengar;C. Venkobachar
利用从电镀废水处理土壤中分离的细菌对六价铬进行了还原研究。将这些菌株的还原铬能力与从微生物技术研究所获得的纯培养的铜绿假单胞菌以及从花园土壤中获得的实验室分离的环状芽孢杆菌进行了比较。从铬污染土壤中分离和鉴定的凝结芽孢杆菌在所有被研究的生物中具有最大的还原潜力。在所使用的四个电子供体中，苹果酸的生物转化率最高。凝固性芽孢杆菌即使在10 mM的初始铬(VI)浓度下也能降低铬(VI)。随着初始菌体密度的增加，铬(VI)的还原能力也增加，但在低菌体密度时出现最大的比生物转化率。铬(VI)还原的最适pH为7。硫酸盐和硝酸盐不与铬(VI)竞争接受电子。呼吸抑制药如DNP和NaN3的存在...
Investigation on Cr(VI) reduction was conducted using bacteria isolated from soil samples receiving electroplating wastewater. Chromium reduction capacity of these isolates was compared with that of Pseudomonas aeruginosa, a pure culture procured from the Institute of Microbial Technology, as well as Bacillus circulans, a laboratory isolate from garden soil. Bacillus coagulans, isolated and identified from chromium polluted soil, gave maximum reduction potential among all organisms studied. Malate was found to yield maximum biotransformation out of four electron donors employed. B. coagulans was able to reduce Cr(VI) even at 10 mM initial Cr(VI) concentration. With an increase in initial cell density, Cr(VI) reduction capacity was also increased; however, maximum specific biotransformation occurred at low cell densities. The optimum pH for Cr(VI) reduction was 7. Sulphates and nitrates did not compete with Cr(VI) for accepting the electrons. The presence of respiratory inhibitors like DNP and NaN3 margina...