Document Detail

In situ Bioremediation of Uranium with Emulsified Vegetable Oil as the Electron Donor.
MedLine Citation:
PMID:  23697787     Owner:  NLM     Status:  Publisher    
A field test with a one-time emulsified vegetable oil (EVO) injection was conducted to assess the capacity of EVO to sustain uranium bioreduction in a high permeability gravel layer with groundwater concentrations of (mM) U, 0.0055; Ca, 2.98; NO3-, 0.11; HCO3-, 5.07; and SO42-, 1.23. Comparison of bromide and EVO migration and distribution indicated that a majority of the injected EVO was retained in the subsurface from the injection wells to 50 m downgradient. Nitrate, uranium, and sulfate were sequentially removed from the groundwater within 1-2 weeks, accompanied by an increase in acetate, Mn, Fe, and methane concentrations. Due to the slow release and degradation of EVO with time, reducing conditions were sustained for approximately one year and daily U discharge to a creek, located approximately 50 m from the injection wells, decreased by 80% within 100 days. Total U discharge was reduced by 50% over the one year period. Reduction of U(VI) to U(IV) was confirmed by synchrotron analysis of recovered aquifer solids. Oxidants (e.g. dissolved oxygen, nitrate) flowing in from upgradient appeared to re-oxidize and re-mobilize uranium after the EVO was exhausted as evidenced by a transient increase of U concentration above ambient values. Occasional (e.g. annual) EVO injection into a permeable Ca and bicarbonate-containing aquifer can sustain uranium bioreduction/immobilization and decrease U migration/discharge.
David B Watson; Weimin Wu; Tonia Mehlhorn; Guoping Tang; Jennifer Earles; Kenneth Lowe; Thomas M Gihring; Gengxin Zhang; Jana Phillips; Maxim Boyanov; Brian P Spalding; Christopher Schadt; Kenneth M Kemner; Craig S Criddle; Philip M Jardine; Scott C Brooks
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-5-22
Journal Detail:
Title:  Environmental science & technology     Volume:  -     ISSN:  1520-5851     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2013 May 
Date Detail:
Created Date:  2013-5-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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