Document Detail


Microbial recovery of copper from printed circuit boards of waste computer by Acidithiobacillus ferrooxidans.
MedLine Citation:
PMID:  15533017     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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 5190 mg L(-1) when the initial concentration of Fe2+ ion was 7 g L(-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.
Authors:
Moon-Sung Choi; Kyung-Suk Cho; Dong-Su Kim; Dong-Jin Kim
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering     Volume:  39     ISSN:  1093-4529     ISO Abbreviation:  J Environ Sci Health A Tox Hazard Subst Environ Eng     Publication Date:  2004  
Date Detail:
Created Date:  2004-11-09     Completed Date:  2005-01-31     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  9812551     Medline TA:  J Environ Sci Health A Tox Hazard Subst Environ Eng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2973-82     Citation Subset:  IM    
Affiliation:
Environmental Science and Engineering, Ewha Womans University, Seoul, Korea.
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MeSH Terms
Descriptor/Qualifier:
Acidithiobacillus / chemistry,  physiology*
Bioreactors
Chemical Precipitation
Conservation of Natural Resources*
Copper / chemistry,  isolation & purification*
Electronics*
Solubility
Chemical
Reg. No./Substance:
7440-50-8/Copper

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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