SEED - Sanitary Environmental Engineering Division, Department of Civil Engineering, University of Salerno, via Giovanni Paolo II, 84084 Fisciano, SA, Italy.
SEED - Sanitary Environmental Engineering Division, Department of Civil Engineering, University of Salerno, via Giovanni Paolo II, 84084 Fisciano, SA, Italy.
J Environ Manage. 2018 Mar 15;210:180-190. doi: 10.1016/j.jenvman.2017.12.066.
A bioleaching process developed in two separate steps was investigated for the recovery of base metals, precious metals and rare earth elements from dusts generated by Waste Electrical and Electronic Equipment (WEEE) shredding. In the first step, base metals were almost completely leached from the dust in 8 days by Acidithiobacillus thiooxidans (DSM 9463) that lowered the pH of the leaching solution from 3.5 to 1.0. During this step, cerium, europium and neodymium were mobilized at high percentages (>99%), whereas lanthanum and yttrium reached an extraction yield of 80%. In the second step, the cyanide producing Pseudomonas putida WSC361 mobilized 48% of gold within 3 h from the A. thiooxidans leached shredding dust. This work demonstrated the potential application of biohydrometallurgy for resource recovery from WEEE shredding dust, destined to landfill disposal, and its effectiveness in the extraction of valuable substances, including elements at high supply risk as rare earths.
从废弃电子电气设备（WEEE）粉碎产生的粉尘中回收基础金属、贵金属和稀土元素的两步生物浸出工艺进行了研究。在第一步中，嗜酸硫杆菌（DSM 9463）在 8 天内几乎完全浸出了粉尘中的基础金属，将浸出溶液的 pH 值从 3.5 降低到 1.0。在此过程中，铈、铕和钕的迁移率很高（>99%），而镧和钇的提取率达到 80%。在第二步中，产氰假单胞菌 WSC361 在 3 小时内从嗜酸硫杆菌浸出的粉碎粉尘中提取了 48%的金。这项工作证明了生物冶金在从注定要填埋处置的 WEEE 粉碎粉尘中回收资源方面的应用潜力，以及它在提取有价值物质方面的有效性，包括供应风险高的元素如稀土元素。
