Bioleaching of copper from waste printed circuit boards by bacterial consortium enriched from acid mine drainage.
Bioleaching of copper from waste printed circuit boards by bacterial consortium enriched from acid mine drainage.
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DOI：
10.1016/j.jhazmat.2010.08.113
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发表时间：
2010-12
影响因子：
13.6
通讯作者：
Yun Xiang;Ping-xiao Wu;Nengwu Zhu;Ting Zhang;Wen Liu;Jinhua Wu;Ping Li
中科院分区：
文献类型：
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作者：
Yun Xiang;Ping-xiao Wu;Nengwu Zhu;Ting Zhang;Wen Liu;Jinhua Wu;Ping Li
研究了从天然酸性矿山废水中富集的微生物菌群对废弃印刷电路板（PCB）中铜的溶解性，确定了微生物浸出PCBs中铜的最佳条件。结果表明，铜的提取主要是通过亚铁离子氧化菌产生的铁离子间接氧化实现的。初始pH值和Fe ~（2+）浓度对铜的萃取和沉淀的形成起重要作用。PCB粉投加量越低，铜的浸出率越高。此外，为了保证细菌的生长和获得合适的Fe 2+氧化速率，两步反应是非常必要的，建议在溶液中Fe 2+残留量为6.25g/L时加入PCB粉末。在初始pH值为1.5、初始Fe ~（2+）浓度为9 g/L、PCB粉用量为20 g/L的条件下，5d后铜的浸出率最高，达到95%。研究结果表明，利用复合菌群可以有效地从废PCB中浸出铜，浸出周期由12 d左右缩短到5 d左右。
The objectives of this study were to evaluate the solubility of copper in waste printed circuit boards (PCBs) by bacterial consortium enriched from natural acid mine drainage, and to determine optimum conditions of bioleaching copper from PCBs. The results indicated that the extraction of copper was mainly accomplished indirectly through oxidation by ferric ions generated from ferrous ion oxidation bacteria. The initial pH and Fe2+concentration played an important role in copper extraction and precipitate formation. The leaching rate of copper was generally higher at lower PCB powder dosage. Moreover, a two-step process was extremely necessary for bacterial growth and obtaining an appropriate Fe2+oxidation rate; a suitable time when 6.25g/L of Fe2+remained in the solution was suggested for adding PCB powder. The maximum leaching rate of copper was achieved 95% after 5 days under the conditions of initial pH 1.5, 9g/L of initial Fe2+, and 20g/L of PCB powder. All findings demonstrated that copper could be efficiently solubilized from waste PCBs by using bacterial consortium, and the leaching period was shortened remarkably from about 12 days to 5 days.