铬渣中6价铬的微生物解毒研究(英文)

Microbial Detoxification of Hexavalent Chromium from Chromium-Containing Slag

详细研究了微生物处理铬渣中6价铬Cr(Ⅵ)及其回收Cr(Ⅲ)的方法.研究成果表明,来自铬渣场的一株名为Ch-1的细菌能有效地加速Cr(Ⅵ)浸出和去除;此外,通过扫描电子扫描电镜(SEM)和X射线仪器(EDX)观察,Ch-1细菌能有效改变浸出后铬渣的结构,这有利于铬渣中Cr(Ⅵ)浸出及其解毒为毒性低的Cr(Ⅲ);最后经浸出毒性试验,淋溶渣的毒性为3.3μg/g,远低于国家标准5μg/g,且6价铬Cr(Ⅵ)的回收率高达90%以上.

In this paper, treatment and recovery of hexavalent chromium（Cr（VI ）） from chromium-containing slag by bacteria was studied. The work showed that a bacterial strains of Ch-1 isolated from chromium-containing slag can efficiently accelerate Cr（VI） leaching and remove it. Moreover,bacteria Ch-1 can effectively change the structure of chromium-containing slag by Scanning Electron Microscopy（SEM） and the Energy Dispersive X-Ray （EDX）,which is benefitial to Cr（VI） leaching and its detoxification by changing Cr（VI） to Cr（ III ）. The effect of; detoxification by bacteria of Ch-1 is obvious, the toxicity in leached slag was 3.3 μg/g lower than the national standard of 5 gg/g,and the recovery rates of hexavalent chromium are more than 90%.