Document Detail

Removal of chromium from synthetic plating waste by zero-valent iron and sulfate-reducing bacteria.
MedLine Citation:
PMID:  16121509     Owner:  NLM     Status:  MEDLINE    
Experiments were conducted to evaluate the potential of zero-valent iron and sulfate-reducing bacteria (SRB) for reduction and removal of chromium from synthetic electroplating waste. The zero-valent iron shows promising results as a reductant of hexavalent chromium (Cr+6) to trivalent chromium (Cr+3), capable of 100% reduction. The required iron concentration was a function of chromium concentration in the waste stream. Removal of Cr+3 by adsorption or precipitation on iron leads to complete removal of chromium from the waste and was a slower process than the reduction of Cr+6. Presence SRB in a completely mixed batch reactor inhibited the reduction of Cr+6. In a fixed-bed column reactor, SRB enhanced chromium removal and showed promising results for the treatment of wastes with low chromium concentrations. It is proposed that, for waste with high chromium concentration, zero-valent iron is an efficient reductant and can be used for reduction of Cr+6. For low chromium concentrations, a SRB augmented zero-valent iron and sand column is capable of removing chromium completely.
Saumyen Guha; Puja Bhargava
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Water environment research : a research publication of the Water Environment Federation     Volume:  77     ISSN:  1061-4303     ISO Abbreviation:  Water Environ. Res.     Publication Date:    2005 Jul-Aug
Date Detail:
Created Date:  2005-08-26     Completed Date:  2005-12-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9886167     Medline TA:  Water Environ Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  411-6     Citation Subset:  IM    
Department of Civil Engineering, Indian Institute of Technology, Kanpur, India.
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MeSH Terms
Bacteria / metabolism*
Biodegradation, Environmental
Carcinogens, Environmental / isolation & purification
Chromium / isolation & purification*,  metabolism
Hydrogen-Ion Concentration
Iron Compounds / chemistry*
Sulfates / metabolism
Water Pollutants, Chemical*
Water Purification / methods*
Reg. No./Substance:
0/Carcinogens, Environmental; 0/Iron Compounds; 0/Sulfates; 0/Water Pollutants, Chemical; 18540-29-9/chromium hexavalent ion; 7440-47-3/Chromium

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