Bioleaching waste printed circuit boards by Acidithiobacillus ferrooxidans and its kinetics aspect.

Yuankun Yang, Shu Chen, Shicheng Li, Mengjun Chen, Haiyan Chen, Bijun Liu

Journal: Journal of biotechnology 2014;173():24-30

PMID: 24445171

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Abstract

In this paper, H(+) consumption and metal recovery, during the process of bioleaching waste printed circuit boards (WPCBs) by Acidithiobacillus ferrooxidans (A. ferrooxidans), were discussed in detail. When the WPCBs concentration was 15g/L, Cu (96.8%), Zn (83.8%), and Al (75.4%) were recovered after 72h by A. ferrooxidans. Experimental results indicated that metal recovery rate was significantly influenced by acid. Based on experimental results, the kinetics of the H(+) consumption and metal recovery on bioleaching WPCBs were represented by reaction kinetic equations. The kinetic of H(+) consumption could be described by the second-order kinetic model. The metal recovery belongs to the second-order model with adding acid, which was changed to the shrinking core model with precipitate production.

Address: Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China.; Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China. Electronic address: [email protected].; Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China.

DOI: 10.1016/j.jbiotec.2014.01.008

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MeSH Terms: Acidithiobacillus, Aluminum, Biodegradation, Environmental, Copper, Electrical Equipment and Supplies, Hydrogen, Industrial Waste, Kinetics, Metals, Zinc