Abstract

The aim of the presented work was to check the effect of pulverization and pre-treatment of the waste mobile printed circuit boards (MPCBs) on bioleaching of copper, zinc and nickel. In the present study, untreated, pre-treated, pulverized and non-pulverized MPCBs were used in the leaching process. The preserved acidophilic iron oxidizer Leptospirillum-dominated consortium was activated and it was used for the bioleaching process. Unpulverized MPCB showed higher extraction of copper and nickel while higher zinc extraction was recorded with pulverized MPCBs. The alkali pre-treatment showed a positive effect on the extraction of copper and zinc while nickel showed higher extraction when MPCB was untreated. Moreover, when the pH of the medium was monitored to 2.0, it showed 1.45 times higher extraction of copper as compared to the system where pH was not adjusted to 2.0 throughout the experiment. The overall optimization of the process showed 27, 33 and 186 fold increase in copper, zinc and nickel extraction. As copper is major metal in any e-waste unpulverized and pre-treatment should be recommended process for the bioleaching.

中文翻译：

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粉碎、预处理和pH调节对废手机印刷电路板金属微生物提取的影响

摘要

所介绍工作的目的是检查粉碎和预处理废移动印刷电路板 (MPCB) 对铜、锌和镍的生物浸出的影响。在本研究中，未处理、预处理、粉碎和未粉碎的 MPCB 用于浸出过程。保存的嗜酸性铁氧化剂钩端螺旋体-主导财团被激活并用于生物浸出过程。未粉碎的 MPCB 显示出更高的铜和镍提取，而粉碎的 MPCB 记录到更高的锌提取。碱预处理对铜和锌的萃取有积极影响，而当 MPCB 未经处理时，镍的萃取率更高。此外，当介质的 pH 值被监测到 2.0 时，与在整个实验中 pH 值未调节到 2.0 的系统相比，它显示出高 1.45 倍的铜提取。该工艺的整体优化显示铜、锌和镍的提取量增加了 27、33 和 186 倍。由于铜是任何未粉碎电子废物中的主要金属，因此应推荐进行生物浸出的预处理过程。