Show simple item record Lauchnor, Ellen G. Schultz, Logan N. Bugni, Steven Mitchell, Andrew Charles Cunningham, Alfred B. Gerlach, Robin 2014-01-09T21:02:44Z 2014-01-09T21:02:44Z 2013-01-02
dc.identifier.citation Lauchnor , E G , Schultz , L N , Bugni , S , Mitchell , A C , Cunningham , A B & Gerlach , R 2013 , ' Bacterially Induced Calcium Carbonate Precipitation and Strontium Coprecipitation in a Porous Media Flow System ' Environmental Science & Technology , vol 47 , no. 3 , pp. 1557–1564 . DOI: 10.1021/es304240y en
dc.identifier.issn 0013-936X
dc.identifier.other PURE: 781454
dc.identifier.other PURE UUID: 622a3a0c-058f-431c-bb5e-c83a652f1c8a
dc.identifier.other crossref: 10.1021/es304240y
dc.identifier.other Scopus: 84873425703
dc.identifier.other PubMed: 23282003
dc.identifier.other 2160/13168
dc.description Lauchnor, E. G., Schultz, L. N., Bugni, S., Mitchell, A. C., Cunningham, A. B., Gerlach, R. (2013). Bacterially induced calcium carbonate precipitation and strontium co-precipitation in a porous media flow system. Environmental Science & Technology, 47 (3), 1557-1564. en
dc.description.abstract Strontium-90 is a principal radionuclide contaminant in the subsurface at several Department of Energy sites in the Western U.S., causing a threat to groundwater quality in areas such as Hanford, WA. In this work, we used laboratory-scale porous media flow cells to examine a potential remediation strategy employing coprecipitation of strontium in carbonate minerals. CaCO3 precipitation and strontium coprecipitation were induced via ureolysis by Sporosarcina pasteurii in two-dimensional porous media reactors. An injection strategy using pulsed injection of calcium mineralization medium was tested against a continuous injection strategy. The pulsed injection strategy involved periods of lowered calcite saturation index combined with short high fluid velocity flow periods of calcium mineralization medium followed by stagnation (no-flow) periods to promote homogeneous CaCO3 precipitation. By alternating the addition of mineralization and growth media the pulsed strategy promoted CaCO3 precipitation while sustaining the ureolytic culture over time. Both injection strategies achieved ureolysis with subsequent CaCO3 precipitation and strontium coprecipitation. The pulsed injection strategy precipitated 71–85% of calcium and 59% of strontium, while the continuous injection was less efficient and precipitated 61% of calcium and 56% of strontium. Over the 60 day operation of the pulsed reactors, ureolysis was continually observed, suggesting that the balance between growth and precipitation phases allowed for continued cell viability. Our results support the pulsed injection strategy as a viable option for ureolysis-induced strontium coprecipitation because it may reduce the likelihood of injection well accumulation caused by localized mineral plugging while Sr coprecipitation efficiency is maintained in field-scale applications. en
dc.format.extent 8 en
dc.language.iso eng
dc.relation.ispartof Environmental Science & Technology en
dc.rights en
dc.title Bacterially Induced Calcium Carbonate Precipitation and Strontium Coprecipitation in a Porous Media Flow System en
dc.type /dk/atira/pure/researchoutput/researchoutputtypes/contributiontojournal/article en
dc.contributor.institution Department of Geography and Earth Sciences en
dc.contributor.institution Centre for Glaciology en
dc.description.status Peer reviewed en

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