A Newly Acidophilic Bacterium Acidomyces acidothermus Was Isolated to Efficiently Bioleach Copper from Waste Printed Circuit Boards (WPCBs)

Xiafei Yin, Xuan Shan, Guobin Liang (), Quanfa Zhou () and Wei Lin
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Xiafei Yin: Jiangsu Key Laboratory of E-waste Recycling, School of Resources and Environmental Engineering, Jiangsu University of Technology, Changzhou 213001, China
Xuan Shan: Jiangsu Key Laboratory of E-waste Recycling, School of Resources and Environmental Engineering, Jiangsu University of Technology, Changzhou 213001, China
Guobin Liang: Jiangsu Key Laboratory of E-waste Recycling, School of Resources and Environmental Engineering, Jiangsu University of Technology, Changzhou 213001, China
Quanfa Zhou: Jiangsu Province Engineering Research Center of Ex-Service PV Module Resourceful Utilization, Changzhou Institute of Technology, Changzhou 213032, China
Wei Lin: Jiangsu Key Laboratory of E-waste Recycling, School of Resources and Environmental Engineering, Jiangsu University of Technology, Changzhou 213001, China

Sustainability, 2023, vol. 15, issue 3, 1-17

Abstract: An acidophilic metal-resistant bacterial strain, Acidomyces acidothermus ( A . acidothermus ), was isolated and identified by morphology, physiology, biochemistry, and 16S rDNA. A . acidothermus culture conditions were optimized by response surface methodology (RSM). Results showed that with a temperature of 40 °C, a pH of 3 in a 9k medium, and a rotation speed of 140 r/min, the copper leaching rate reached the highest value of 39.8%. Furthermore, SEM images and a heatmap of differential metabolites indicated that A. acidothermus adsorbed on the surface of WPCBs and extracellular polymeric substances (EPS), mainly D-glucuronic acid, were secreted, suggesting the highly efficient mechanism of copper recovery from WPCBs.

Keywords: Acidomyces acidothermus; culture optimization; bioleaching mechanism (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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