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Bioleaching Process for Metal Recovery from Waste Materials

机译：废料中金属回收的生物浸涂过程

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In this study, the recycling of waste materials is interesting in the environmental aspect to reduce the amount of waste in landfill and attenuate the pollution of groundwater, air and soil due to the liberation of dangerous elements. Recycling materials is an important issue once it represents a potential source of valuable metals. Waste printed wired boards (PWBs) as a principal part of Waste Electrical and Electronic Equipment (WEEE) and it is a fast growing stream with complex composition. The composite materials from PWBs are ceramic, polymers and metals. Biohydrometallurgical route may offer possibilities to recycle PWBs from discarded computers with the order to recover copper. The extraction of copper from PWBs by bioleaching processes was studied using a mixed culture of acidophilic bacteria from acid mine drainage (AMD) and the bacteria Acidithiobacillus ferrooxidans (A.ferrooxidans). The bioleaching experiments were performed in shaker flasks at temperature 30°C and 170 rpm with 10% (v/v) inoculum and pulp density of 35 g/L. The metals concentration was determined by energy dispersive X-ray Fluorescence (XRF). The results showed that the maximum copper recovery from PWBs using A. ferrooxidans was approximately 89% and with a mixed culture of bacteria from AMD the copper recovery was 92%.
机译：在这项研究中，废旧物资的回收利用是在环保方面，以减少垃圾填埋量和衰减的地下水，大气，土壤等污染有趣因危险因素的解放。回收材料是一个重要的问题，一旦它代表贵重金属的潜在来源。浪费印刷布线板（印刷线路板）作为废弃电气和电子设备（WEEE）的主要部分，它是具有复杂组成的快速增长的流。从印刷线路板的复合材料是陶瓷，聚合物和金属。 Biohydrometallurgical的途径可随着以回收铜提供从废弃电脑可能性再循环的PWB。使用从酸性矿山排水（AMD）和细菌氧化亚铁硫杆菌（A.ferrooxidans）嗜酸菌的混合培养物的铜从生物浸出工艺的PWB的提取进行了研究。生物浸出实验在摇瓶中在温度30℃和170rpm下用10％（V / V）接种物和纸浆35克/升的密度执行。金属浓度是通过能量色散X射线荧光（XRF）测定。结果表明，从使用A.氧化亚铁硫杆菌的PWB的最大铜回收约为89％，并与来自AMD细菌的混合培养物中的铜的回收率为92％。

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