Document Detail

Immobilization of uranium and arsenic by injectible iron and hydrogen stimulated autotrophic sulphate reduction.
MedLine Citation:
PMID:  17719126     Owner:  NLM     Status:  MEDLINE    
The main object of the study was the development of a long-term efficient and inexpensive in-situ immobilization technology for uranium (U) and arsenic (As) in smaller and decentralized groundwater discharges from abandoned mining processing sites. Therefore, corrosion of grey cast iron (gcFe) and nano-scale iron particles (naFe) as well as hydrogen stimulated autotrophic sulphate reduction (aSR) were investigated. Two column experiments with sulphate reducing bacterias (SRB) (biotic gcFe , biotic naFe) and one abiotic gcFe-column experiment were performed. In the biotic naFe column, no particle translocation was observed and a temporary but intensive naFe corrosion indicated by a decrease in E(h), a pH increase and H(2) evolution. Decreasing sulphate concentrations and (34)S enrichment in the column effluent indicated aSR. Fe(II) retention could be explained by siderite and consequently FeS precipitation by geochemical modeling (PhreeqC). U and As were completely immobilised within the biotic naFe column. In the biotic gcFe column, particle entrapment in open pore spaces resulted in a heterogeneous distribution of Fe-enriched zones and an increase in permeability due to preferential flow. However, Fe(II) concentrations in the effluent indicated a constant and lasting gcFe corrosion. An efficient immobilization was found for As, but not for U.
D Burghardt; E Simon; K Knöller; A Kassahun
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-07-18
Journal Detail:
Title:  Journal of contaminant hydrology     Volume:  94     ISSN:  0169-7722     ISO Abbreviation:  J. Contam. Hydrol.     Publication Date:  2007 Dec 
Date Detail:
Created Date:  2007-11-12     Completed Date:  2008-01-31     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8805644     Medline TA:  J Contam Hydrol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  305-14     Citation Subset:  IM    
Dresden Centre of Groundwater Research, D-01217, Dresden, Germany.
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MeSH Terms
Arsenic / chemistry*
Bacteria / metabolism
Hydrogen / chemistry
Iron / chemistry*
Nanoparticles / chemistry
Sulfates / metabolism
Uranium / chemistry*
Water Pollutants, Chemical / chemistry*
Water Pollutants, Radioactive / chemistry*
Water Purification / methods
Reg. No./Substance:
0/Sulfates; 0/Water Pollutants, Chemical; 0/Water Pollutants, Radioactive; 1333-74-0/Hydrogen; 7439-89-6/Iron; 7440-38-2/Arsenic; 7440-61-1/Uranium

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