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首页> 外文期刊>Journal of Chemical Technology & Biotechnology >Bioleaching of heavy metals from dewatered sludge by Acidithiobacillus ferrooxidans
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Bioleaching of heavy metals from dewatered sludge by Acidithiobacillus ferrooxidans

机译：酸性氧化铁硫杆菌对脱水污泥中的重金属进行生物浸出

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摘要

The feasibility of bioleaching for removal of heavy metals from dewatered sewage sludge using an iron-oxidizing bacterium Acidithiobacillus ferrooxidans was investigated. The influence of seven process parameters including cell adaptation, total amount and particle size of the sludge, initial concentrations of Fe2+ and At ferrooxidans, and addition of inorganic nutrients and sulfur were evaluated in terms of the solubilization of Zn, Cu and Cr. When sludge-adapted cells, addition of inorganic nutrients and lower sludge content were involved, higher yields of metal extraction were obtained. However, higher initial concentrations of At ferrooxidans and Fe2+, fine particle size of the sludge and S addition did not improve the metals' solubilization during an experimental period of 7 days. As a result of a long-term (40 days) bioleaching experiment, 42% of Zn (1300-1648 mg kg(-1)), 39% of Cu (613-774 mg kg(-1)) and 10% of Cr (37-44 mg kg(-1)) in the sludge were leached into the solution. The results indicate that a bioleaching process conducted under operationally optimal conditions can be effectively employed for the removal of heavy metals from sewage sludge before land application. (c) 2005 Society of Chemical Industry.
机译：研究了使用铁氧化细菌酸性氧化亚铁细菌氧化铁生物浸出去除脱水污泥中重金属的可行性。根据锌，铜和铬的增溶性，评估了七个工艺参数的影响，包括细胞适应性，污泥的总量和粒径，Fe2 +和At铁氧化物的初始浓度以及无机养分和硫的添加。当适应污泥的细胞，添加无机养分和降低污泥含量时，可以获得更高的金属提取率。然而，较高的初始浓度的At亚铁氧化物和Fe2 +，污泥的细颗粒尺寸以及S的添加在7天的实验时间内都无法改善金属的溶解性。长期（40天）生物浸出实验的结果是，42％的Zn（1300-1648 mg kg（-1）），39％的Cu（613-774 mg kg（-1））和10％污泥中的铬（37-44 mg kg（-1））被浸出到溶液中。结果表明，在最佳操作条件下进行的生物浸出工艺可以有效地用于土地施用前从污水污泥中去除重金属。 （c）2005年化学工业协会。

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