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dc.contributor.authorViamajala, Sridhar
dc.contributor.authorPeyton, Brent M.
dc.contributor.authorGerlach, Robin
dc.contributor.authorVaideeswaran, S.
dc.contributor.authorApel, William A.
dc.contributor.authorPetersen, James N.
dc.date.accessioned2017-07-06T19:25:51Z
dc.date.available2017-07-06T19:25:51Z
dc.date.issued2008-12
dc.identifier.citationViamajala S, Gerlach R, Sivaswamy V, Peyton BM, Apel WA, Cunningham AB, Petersen JN, "Permeable reactive biobarriers for in-situ Cr(VI) reduction: Bench scale tests using Cellulomonas sp. strain ES6," Biotechnol Bioeng 2008 101(6):pp 1150-1162en_US
dc.identifier.issn0006-3592
dc.identifier.urihttps://scholarworks.montana.edu/xmlui/handle/1/13185
dc.description.abstractChromate (Cr(VI)) reduction studies were performed in bench scale flow columns using the fermentative subsurface isolate Cellulomonas sp. strain ES6. In these tests, columns packed with either quartz sand or hydrous ferric oxide (HFO)-coated quartz sand, were inoculated with strain ES6 and fed nutrients to stimulate growth before nutrient-free Cr(VI) solutions were injected. Results show that in columns containing quartz sand, a continuous inflow of 2 mg/L Cr(VI) was reduced to below detection limits in the effluent for durations of up to 5.7 residence times after nutrient injection was discontinued proving the ability of strain ES6 to reduce chromate in the absence of an external electron donor. In the HFO-containing columns, Cr(VI) reduction was significantly prolonged and effluent Cr(VI) concentrations remained below detectable levels for periods of up to 66 residence times after nutrient injection was discontinued. Fe was detected in the effluent of the HFOcontaining columns throughout the period of Cr(VI)removal indicating that the insoluble Fe(III) bearing solids were being continuously reduced to form soluble Fe(II) resulting in prolonged abiotic Cr(VI) reduction. Thus, growth of Cellulomonas within the soil columns resulted in formation of permeable reactive barriers that could reduce Cr(VI) and Fe(III) for extended periods even in the absence of external electron donors. Other bioremediation systems employing Fe(II)-mediated reactions require a continuous presence of external nutrients to regenerate Fe(II). After depletion of nutrients, contaminant removal within these systems occurs by reaction with surface-associated Fe(II) that can rapidly become inaccessible due to formation of crystalline Fe-minerals or other precipitates. The ability of fermentative organisms like Cellulomonas to reduce metals without continuous nutrient supply in the subsurface offers a viable and economical alternative technology for in situ remediation of Cr(VI)-contaminated groundwater through formation of permeable reactive biobarriers (PRBB).en_US
dc.titlePermeable reactive biobarriers for in-situ Cr(VI) reduction: Bench scale tests using Cellulomonas sp. strain ES6en_US
dc.typeArticleen_US
mus.citation.extentfirstpage1150en_US
mus.citation.extentlastpage1162en_US
mus.citation.issue6en_US
mus.citation.journaltitleBiotechnology and Bioengineeringen_US
mus.citation.volume101en_US
mus.identifier.categoryEngineering & Computer Scienceen_US
mus.identifier.doi10.1002/bit.22020en_US
mus.relation.collegeCollege of Engineeringen_US
mus.relation.departmentCenter for Biofilm Engineering.en_US
mus.relation.departmentChemical & Biological Engineering.en_US
mus.relation.departmentChemical Engineering.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.relation.researchgroupCenter for Biofilm Engineering.en_US
mus.data.thumbpage2en_US
mus.contributor.orcidPeyton, Brent M.|0000-0003-0033-0651en_US


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