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Microbial recovery of copper from printed circuit boards of waste computer by Acidithiobacillus ferrooxidans

Title
Microbial recovery of copper from printed circuit boards of waste computer by Acidithiobacillus ferrooxidans
Authors
Choi, NSCho, KSKim, DSKim, DJ
Ewha Authors
조경숙김동수
SCOPUS Author ID
조경숙scopus; 김동수scopus
Issue Date
2004
Journal Title
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
ISSN
1093-4529JCR Link
Citation
vol. 39, no. 11-12, pp. 2973 - 2982
Keywords
microbial recoverycopperprinted circuit boardAcidithiobacillus ferrooxidanswaste computer
Publisher
MARCEL DEKKER INC
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The bioleaching of copper contained in the printed circuit boards (PCB) of waste computers by A. ferrooxidans was studied. The Fe oxidation rates by A. ferrooxidans in the 9K medium supplemented with the leachate of PCB (0. 15-0.13 g L-1 d(-1)) were similar to that in the 9K medium without the leachate (0. 15 g L-1 d(-1)). This finding Suggests that the leachate of PCB did not seriously affect the bioleaching process by this bacterium. The amount of copper leached from PCB shreds increased with the addition of ferrous ion and reached up to 5190mg L-1 when the initial concentration of Fe2+ ion was 7gL(-1). As the microbial leaching progressed, pale brown precipitate was observed to form in the Solution. Based on the total amount of copper, both in solution and precipitate, the optimal addition of ferrous ion for the leaching of copper was around 7 g L-1. When citric acid was not added, only about 37 wt% of the total leached copper remained dissolved; however, the amount of dissolved copper increased to greater than 80 wt% in the presence of citric acid. This fact indicates that the addition of a complexing agent (citric acid) to the bioleaching solution can raise the solubility of the leached metal ions.
DOI
10.1081/LESA-200034763
Appears in Collections:
엘텍공과대학 > 환경공학전공 > Journal papers
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