Document Detail

Effects of carbonate precipitates on long-term performance of granular iron for reductive dechlorination of TCE.
MedLine Citation:
PMID:  17120576     Owner:  NLM     Status:  MEDLINE    
Long-term column experiments were conducted to evaluate the effects of secondary carbonate minerals on permeability and reactivity of commercial granular iron treating trichloroethene (TCE). The results showed that carbonate precipitates caused a decrease in reactivity of the iron, and spatially and temporally varying reactivity loss resulted in migration of mineral precipitation fronts, as well as profiles of TCE, pH, alkalinity, calcium, and dissolved iron. In the columns receiving solutions of dissolved calcium carbonate, porosity gradually decreased in proportion to the source concentrations, as carbonate minerals accumulated. However, the rate of porosity loss slowed over time because of the declining reactivity of the iron. Thus, secondary minerals are not likely to accumulate to the extent that there is a substantial reduction in hydraulic conductivity. The reactivity of the iron was found to decrease as an exponential function of the carbonate mineral volume fraction. This changing reactivity of iron should be incorporated into predictive models for improved designs of iron permeable reactive barriers (PRBs).
Sung-Wook Jeen; Robert W Gillham; David W Blowes
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  40     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2006 Oct 
Date Detail:
Created Date:  2006-11-22     Completed Date:  2007-01-16     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  6432-7     Citation Subset:  IM    
Department of Earth Sciences, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.
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MeSH Terms
Calcium Carbonate / chemistry
Carbonates / chemistry*
Chemical Precipitation
Chlorine / chemistry*,  isolation & purification
Hydrogen-Ion Concentration
Iron / chemistry*
Models, Theoretical
Trichloroethylene / chemistry*,  isolation & purification
Water Purification / methods
Reg. No./Substance:
0/Carbonates; 471-34-1/Calcium Carbonate; 7439-89-6/Iron; 7782-50-5/Chlorine; 79-01-6/Trichloroethylene

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

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