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Development and validation of a model of bio-barriers for remediation of Cr(VI) contaminated aquifers using laboratory column experiments
, , T.Shashidhar
Published in Elsevier B.V.
2007
PMID: 17161527
Volume: 145
   
Issue: 3
Pages: 437 - 452
Abstract
Bench scale transport and biotransformation experiments and mathematical model simulations were carried out to study the effectiveness of bio-barriers for the containment of hexavalent chromium in contaminated confined aquifers. Experimental results showed that a 10 cm thick bio-barrier with an initial biomass concentration of 0.205 mg/g of soil was able to completely contain a Cr(VI) plume of 25 mg/L concentration. It was also observed that pore water velocity and initial biomass concentration are the most significant parameters in the containment of Cr(VI). The mathematical model developed is based on one-dimensional advection-dispersion reaction equations for Cr(VI) and molasses in saturated, homogeneous porous medium. The transport of Cr(VI) and molasses is coupled with adsorption and Monod's inhibition kinetics for immobile bacteria. It was found that, in general, the model was able to simulate the experimental results satisfactorily. However, there was disparity between the numerically simulated and experimental breakthrough curves for Cr(VI) and molasses in cases where there was high clay content and high microbial activity. The mathematical model could contribute towards improved designs of future bio-barriers for the remediation of Cr(VI) contaminated aquifers. © 2006 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 (47)
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    Adsorption
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    Aquifers
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    Computer simulation
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    Contamination
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    Mathematical models
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    Reaction kinetics
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    Biotransformation
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    Column experiments
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    CONTAMINANT TRANSPORT MODEL
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    Hexavalent chromium
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    Water pollution control
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    Chromium
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    Molasses
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    Advection
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    AQUIFER POLLUTION
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    Biomass
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    Concentration (composition)
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    Laboratory method
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    Microbial activity
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    MOLASSE
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    Numerical model
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    POREWATER
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    Remediation
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    Aquifer
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    Article
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    Bioremediation
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    Clay
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    COLONY FORMING UNIT
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    Laboratory test
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    Mathematical model
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    Nonhuman
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    Plume
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    Porosity
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    Reaction analysis
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    Simulation
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    Soil
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    Soil microflora
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    Validation process
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    Velocity
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    WATER CONTAMINATION
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    Water treatment
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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 pollutants, chemical
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    Water supply