A Novel Designed Bioreactor for Recovering Precious Metals from Waste Printed Circuit Boards

Scientific Reports
Ruan JujunJianwen Zhang

Abstract

For recovering precious metals from waste printed circuit boards (PCBs), a novel hybrid technology including physical and biological methods was developed. It consisted of crushing, corona-electrostatic separation, and bioleaching. Bioleaching process is the focus of this paper. A novel bioreactor for bioleaching was designed. Bioleaching was carried out using Pseudomonas chlororaphis. Bioleaching experiments using mixed particles of Au and Cu were performed and leachate contained 0.006 mg/L, 2823 mg/L Au(+) and Cu(2+) respectively. It showed when Cu existed, the concentrations of Au were extremely small. This provided the feasibility to separate Cu from Au. The method of orthogonal experimental design was employed in the simulation bioleaching experiments. Experimental results showed the optimized parameters for separating Cu from Au particles were pH 7.0, temperature 22.5 °C, and rotation speed 80 r/min. Based on the optimized parameters obtained, the bioreactor was operated for recovering mixed Au and Cu particles. 88.1 wt.% of Cu and 76.6 wt.% of Au were recovered. The paper contributed important information to recover precious metals from waste PCBs.

References

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Citations

Sep 30, 2016·Environmental Science and Pollution Research International·Abhishek Kumar AwasthiJinhui Li
Jan 18, 2017·Waste Management & Research : the Journal of the International Solid Wastes and Public Cleansing Association, ISWA·Abhishek Kumar AwasthiJinhui Li
Nov 17, 2017·Macromolecular Bioscience·Wei WeiHae Lin Jang
Jan 2, 2020·Journal of Environmental Sciences (China)·Supriyanka RanaLakhveer Singh
Jul 3, 2021·Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine·Anil KumarSudhir Kumar

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Methods Mentioned

BETA
chemical treatment
chemical leaching

Software Mentioned

MEGA
DNAMAN

Related Concepts

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Bioreactors (ASM)

Bioreactors are important devices or systems that utilize living cells or enzymes for a chemical process. These devices carefully control and monitor the environment factors such as pH, nutrients level, and temperature, which can affect the yield in a given process. Discover the latest research here.