Bioremediation of Hexavalent Chromium By Bacteria Isolated From Buriganga River, Dhaka City

Stamford Journal of Microbiology Pub Date : 2023-12-21 DOI:10.3329/sjm.v13i1.70411

SM Osail, SI Sanny, MS Kabir

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Abstract

Environmental pollution due to hexavalent chromium (Cr6+) is widespread because of the anthropogenic activities in various industrial processes, notably in leather tanning. Hexavalent chromium (Cr6+) is considered as highly toxic, carcinogenic, and mutagenic due to its high solubility in water, interaction with cellular proteins, and biological membrane permeability. Trivalent chromium (Cr3+), on the other hand, is less water-soluble, and relatively benign in nature. Thus, bioreduction of toxic Cr6+ to relatively non-toxic Cr3+ by microorganisms can be an inexpensive and eco-friendly option for chromium bioremediation. In this regard, the present study attempted to isolate chromium-reducing bacteria from Buriganga River in order to assess their capability for chromium bioremediation. Ten chromium-tolerating bacterial isolates were successfully identified. The results revealed that these isolates, particularly strains of Bacillus subtilis, exhibited a remarkable ability to remove up to 89% of hexavalent chromium from the contaminated medium within three days of incubation. Stamford Journal of Microbiology, 2023. Vol. 13, Issue 1, p. 25-29

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达卡市布里根加河分离出的细菌对六价铬的生物修复作用

六价铬（Cr6+）造成的环境污染非常普遍，原因是人类在各种工业加工过程中的活动，特别是在皮革鞣制过程中。由于六价铬（Cr6+）在水中的高溶解度、与细胞蛋白质的相互作用以及生物膜的渗透性，它被认为具有高毒性、致癌性和致突变性。而三价铬（Cr3+）的水溶性较低，性质相对温和。因此，利用微生物将有毒的 Cr6+ 生物还原成相对无毒的 Cr3+，是一种成本低廉、生态友好的铬生物修复方法。为此，本研究尝试从 Buriganga 河中分离铬还原细菌，以评估其进行铬生物修复的能力。研究成功鉴定了 10 个耐铬细菌分离物。结果表明，这些分离菌株，尤其是枯草芽孢杆菌菌株，在培养三天内就能从受污染的培养基中去除高达 89% 的六价铬。斯坦福微生物学杂志》，2023 年。第 13 卷第 1 期第 25-29 页

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Stamford Journal of Microbiology

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