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dc.contributor.authorMitchell, Andrew C.
dc.contributor.authorDideriksen, K.
dc.contributor.authorSpangler, Lee H.
dc.contributor.authorCunningham, Alfred B.
dc.contributor.authorGerlach, Robin
dc.identifier.citationMitchell AC, Dideriksen K, Spangler LH, Cunningham AB, Gerlach R, "Microbially enhanced carbon capture and storage by mineral-trapping and solubility-trapping," Environ Sci Technol, 2010 44(13):5270-5276en_US
dc.description.abstractThe potential of microorganisms for enhancing carbon capture and storage (CCS) via mineral-trapping (where dissolved CO2 is precipitated in carbonate minerals) and solubility trapping (as dissolved carbonate species in solution) was investigated. The bacterial hydrolysis of urea (ureolysis) was investigated in microcosms including synthetic brine (SB) mimicking a prospective deep subsurface CCS site with variable headspace pressures [p(CO2)] of 13C-CO2. Dissolved Ca2+ in the SB was completely precipitated as calcite during microbially induced hydrolysis of 5-20 g L-1 urea. The incorporation of carbonate ions from 13C-CO2 (13C-CO32-) into calcite increased with increasing p(13CO2) and increasing urea concentrations: from 8.3% of total carbon in CaCO3 at 1 g L-1 to 31% at 5 g L-1, and 37% at 20 g L-1. This demonstrated that ureolysis was effective at precipitating initially gaseous [CO2(g)] originating from the headspace over the brine. Modeling the change in brine chemistry and carbonate precipitation after equilibration with the initial p(CO2) demonstrated that no net precipitation of CO2(g) via mineral-trapping occurred, since urea hydrolysis results in the production of dissolved inorganic carbon. However, the pH increase induced by bacterial ureolysis generated a net flux of CO2(g) into the brine. This reduced the headspace concentration of CO2 by up to 32 mM per 100 mM urea hydrolyzed because the capacity of the brine for carbonate ions was increased, thus enhancing the solubility-trapping capacity of the brine. Together with the previously demonstrated permeability reduction of rock cores at high pressure by microbial biofilms and resilience of biofilms to supercritical CO2, this suggests that engineered biomineralizing biofilms may enhance CCS via solubility-trapping, mineral formation, and CO2(g) leakage reduction.en_US
dc.titleMicrobially enhanced carbon capture and storage by mineral-trapping and solubility-trappingen_US
mus.citation.journaltitleEnvironmental Science & Technologyen_US
mus.identifier.categoryChemical & Material Sciencesen_US
mus.identifier.categoryEngineering & Computer Scienceen_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.collegeCollege of Engineeringen_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.departmentCenter for Biofilm Engineering.en_US
mus.relation.departmentChemical & Biological Engineering.en_US
mus.relation.departmentChemical Engineering.en_US
mus.relation.departmentChemistry & Biochemistry.en_US
mus.relation.departmentCivil Engineering.en_US
mus.relation.departmentEnvironmental Engineering.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.relation.researchgroupCenter for Biofilm Engineering.en_US
mus.relation.researchgroupZero Emissions Research and Technology (ZERT).en_US
mus.contributor.orcidMitchell, Andrew C.|0000-0001-9749-5326en_US
mus.contributor.orcidSpangler, Lee H.|0000-0002-3870-6696en_US

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