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Bench-scale column experiments to study the containment of Cr(VI) in confined aquifers by bio-transformation
, , T.Shashidhar
Published in Elsevier B.V.
2006
PMID: 16263213
Volume: 131
   
Issue: 1-3
Pages: 200 - 209
Abstract
Bench-scale soil column experiments were conducted to study the effectiveness of Cr(VI) containment in confined aquifers using in situ bio-transformation. Batch adsorption studies were carried out to estimate the adsorption capacities of two different soils for Cr(VI) and Cr(III). Bio-kinetic parameters were evaluated for the enriched microbial system. The inhibition constant, evaluated using Monod's inhibition model, was found to be 11.46 mg/L of Cr(VI). Transport studies indicated that it would not be possible to contain Cr(VI) by adsorption alone. Transport and bio-transformation studies indicated that the pore velocity and the initial bio-mass concentration significantly affect the containment process. In situ bio-remediation is effective in the case of silty aquifers. Cr(VI) concentration of 25 mg/L was effectively contained within 60 cm of a confined silty aquifer. Cr(VI) containment could be achieved in sandy aquifers when the pore velocity was very low and the initial augmented bio-mass was high. A bio-barrier of approximately one meter width would be able to contain Cr(VI) if the initial Cr(VI) concentration is as much as 25 mg/L. © 2005 Elsevier B.V. All rights reserved.
About the journal
JournalData powered by TypesetJournal of Hazardous Materials
PublisherData powered by TypesetElsevier B.V.
ISSN03043894
Open AccessNo
Concepts (30)
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    Adsorption
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    Aquifers
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    Chromium
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    Concentration (process)
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    Mathematical models
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    Soils
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    BIOBARRIER
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    Biotransformation
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    Column experiments
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    Contaminant transport
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    Water pollution
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    Chromium derivative
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    Aquifer
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    Biomass
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    Bioremediation
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    Pollutant transport
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    Soil
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    Article
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    Bacterial strain
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    Mathematical model
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    Nonhuman
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    Soil analysis
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    Soil pollution
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    Statistical significance
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    Biodegradation, environmental
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    CARCINOGENS, ENVIRONMENTAL
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    Soil microbiology
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    SOIL POLLUTANTS
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    Water supply
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    Bacteria (microorganisms)