Faculty of Biology, University of Latvia
EEB
Hard copy: ISSN 1691–8088
On-line: ISSN 2255–9582
Environ Exp Biol (2019) 17: 85–89
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Environmental and
Experimental
Biology

Environ Exp Biol (2019) 17: 85–89

Orginal Paper

Bioleaching of Cu and Pb from printed circuit boards by Rhizopus oligosporus and Aspergillus niger

Tinnapan Netpae*, Sawitree Suckley
Faculty of Science and Technology, Nakhon Sawan Rajabhat University, Thailand
* Corresponding author, E-mail: tinnapan.n@nsru.ac.th

Abstract

The purposes of this study was to evaluate the ability of Aspergillus niger and Rhizopus oligosporus for one-step bioleaching of Cu and Pb in printed circuit boards (PCBs) scrap from e-waste recycling shops, compared to acidic extraction with citric and lactic acids. The fungal spore suspension was cultivated in potato dextrose broth with dried PCBs and a shaker for 42 days. Every 7 days the leachates were analyzed for Cu and Pb concentrations using atomic absorption spectroscopy. The Cu and Pb concentrations in PCBs in e-waste recycling shops were 152.81 ± 26.54 and 25.62 ± 8.33 g kg–1 PCBs, respectively. The leaching experiment showed that 0.05 M citric acid was the most efficient leaching pure acid: more than 54.59% of Cu and 79.55% of Pb was released into solution. Heavy metal leaching by the lactic acid was less efficient. The best metal bioleaching efficiency was achieved by A. niger fungus, which extracted approximately 46.92% of Cu, and almost 30.63% of Pb from PCBs. R. oligosporus leached only 8.53 and 19.61% of Cu and Pb, respectively.

Key words: Aspergillus niger, bioleaching, Cu, Pb, printed circuit boards, Rhizopus oligosporus.

 
Environ Exp Biol (2019) 17: 85–89
 DOI: http://doi.org/10.22364/eeb.17.08
EEB

Editor-in-Chief
Prof. Gederts Ievinsh
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University of Latvia

 
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