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Investigating critical parameters for bioremoval of heavy metals from computer printed circuit boards using the fungus Aspergillus niger
Hydrometallurgy ( IF 4.7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.hydromet.2020.105464
M. Arshadi , A. Esmaeili , S. Yaghmaei

Abstract In this article, bioleaching of computer printed circuit boards (CPCBs) was examined using Aspergillus niger with one-step, two-step, and spent-medium bioleaching methods. Four effective parameters were optimized using response surface methodology (RSM) to achieve maximum recovery of Cu and Ni. Under optimal conditions – pH of 5.15, pulp density of 10 g/l, 1E+007 spores of A.niger, and 4.5 days for the sample adding time − 97% and 74% of Cu and Ni were recovered, respectively. Two-step bioleaching and spent medium bioleaching were respectively identified as the best methods for maximizing Cu and Ni recovery. Fungi deteriorate the sample mainly by it is chemical action like producing acids. Surface morphology results confirmed the metabolites produced by the fungus—corrosive chemicals—eroded the particles of the e-waste sample during the bioleaching time. The mapping and energy dispersive X-ray (EDAX) of the initial sample and the processed sample validated that bioleaching was quite effective. The overall results indicate that Cu and Ni from e-waste can be recovered through the bioleaching process using A. niger. The addition time (day) of the sample to the solution plays an important role in metal recovery using A. niger. Acid production by the fungi increases the metal recovery, while biocrystallization of heavy metals decreases the recovery. This paper proved the great potential of the biohydrometallurgical route mediate by Aspergillus niger strain for recovering heavy metals from electronic wastes under defined optimal condition, two-step process, 30 °C, and shaking rate of 130rpm.

中文翻译:

使用真菌黑曲霉研究从计算机印刷电路板上生物去除重金属的关键参数

摘要 在本文中,计算机印刷电路板 (CPCB) 的生物浸出使用黑曲霉通过一步法、两步法和废介质生物浸出方法进行了研究。使用响应面法 (RSM) 优化了四个有效参数,以实现 Cu 和 Ni 的最大回收率。在最佳条件下——pH 为 5.15、纸浆密度为 10 g/l、1E+007 黑曲霉孢子和样品添加时间为 4.5 天——分别回收了 97% 和 74% 的 Cu 和 Ni。两步生物浸出和废培养基生物浸出分别被确定为最大限度地提高铜和镍回收率的最佳方法。真菌主要通过产生酸的化学作用使样品变质。表面形态结果证实了真菌产生的代谢物——腐蚀性化学物质——在生物浸出期间侵蚀了电子垃圾样品的颗粒。初始样品和处理过的样品的映射和能量色散 X 射线 (EDAX) 验证了生物浸出非常有效。总体结果表明,可以通过使用 A. niger 的生物浸出过程从电子垃圾中回收 Cu 和 Ni。样品添加到溶液中的时间(天)在使用 A. niger 回收金属方面起着重要作用。真菌产生的酸会增加金属回收率,而重金属的生物结晶会降低回收率。
更新日期:2020-11-01
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