Remediation of Cr(VI) from chromium slag by biocementation | |
Varenyam Achal; Xiangliang Pan; Duu-Jong Lee; Deepika Kumari; Daoyong Zhang | |
2013 | |
发表期刊 | Chemosphere |
卷号 | 93期号:7页码:1352-1358 |
摘要 | Here we demonstrate a calcifying ureolytic bacterium Bacillus sp. CS8 for the bioremediation of chromate (Cr(VI)) from chromium slag based on microbially induced calcite precipitation (MICP). A consolidated structure like bricks was prepared from chromium slags using bacterial cells, and five stage Cr(VI) sequential extraction was carried out to know their distribution pattern. Cr(VI) mobility was found to significantly be decreased in the exchangeable fraction of Cr slag and subsequently, the Cr(VI) concentration was markedly increased in carbonated fraction after bioremediation. It was found that such Cr slag bricks developed high compressive strength with low permeability. Further, leaching behavior of Cr(VI) in the Cr slag was studied by column tests and remarkable decrease in Cr(VI) concentration was noticed after bioremediation. Cr slags from columns were characterized by SEM–EDS confirming MICP process in bioremediation. The incorporation of Cr(VI) into the calcite surface forms a strong complex that leads to obstruction in Cr(VI) release into the environment. As China is facing chromium slag accidents at the regular time intervals, the technology discussed in the present study promises to provide effective and economical treatment of such sites across the country, however, it can be used globally. |
关键词 | Chromium Slag bioremediation biocement calcite urease |
收录类别 | SCI |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gyig.ac.cn/handle/42920512-1/9426 |
专题 | 环境地球化学国家重点实验室 |
作者单位 | 1.Laboratory of Environmental Pollution and Bioremediation, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang 830011, China 2.Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan 3.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550002, China |
推荐引用方式 GB/T 7714 | Varenyam Achal;Xiangliang Pan;Duu-Jong Lee;Deepika Kumari;Daoyong Zhang. Remediation of Cr(VI) from chromium slag by biocementation[J]. Chemosphere,2013,93(7):1352-1358. |
APA | Varenyam Achal;Xiangliang Pan;Duu-Jong Lee;Deepika Kumari;Daoyong Zhang.(2013).Remediation of Cr(VI) from chromium slag by biocementation.Chemosphere,93(7),1352-1358. |
MLA | Varenyam Achal;Xiangliang Pan;Duu-Jong Lee;Deepika Kumari;Daoyong Zhang."Remediation of Cr(VI) from chromium slag by biocementation".Chemosphere 93.7(2013):1352-1358. |
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