title: CO2sequestration by ureolytic microbial consortia through microbially-induced calcite precipitation.
abstract: Urea is an abundant nitrogen-containing compound found in urine of mammals and widely used in fertilizers. This compound is part of the nitrogen biogeochemical cycle and is easily biodegraded by ureolytic microorganisms that have the urease enzyme. Previous studies, with ureolytic isolates, have shown that some ureolytic microorganisms are able to sequester CO2through a process called microbially-induced calcium carbonate precipitation. The present study investigates 15 ureolytic consortia obtained from the "Pamukkale travertines" and the "Cave Without A Name" using different growth media to identify the possible bacterial genera responsible for CO2sequestration through the microbially-induced calcite precipitation (MICP). The community structure and diversity were determined by deep-sequencing. The results showed that all consortia presented varying CO2sequestration capabilities and MICP rates. The CO2sequestration varied between 0 and 86.4%, and it depended largely on the community structure, as well as on pH. Consortia with predominance of Comamonas, Plesiomonas and Oxalobacter presented reduced CO2sequestration. On the other hand, consortia dominated by Sporosarcina, Sphingobacterium, Stenotrophomonas, Acinetobacter, and Elizabethkingia showed higher rates of CO2uptake in the serum bottle headspace.
authors.affiliation: Department of Civil and Environmental Engineering, University of Houston, Houston, TX 77204-4003, USA.
authors.forename: Tugba O
authors.initials: TO
authors.lastname: Okyay
authors.affiliation: Department of Civil and Environmental Engineering, University of Houston, Houston, TX 77204-4003, USA.
authors.forename: Hang N
authors.initials: HN
authors.lastname: Nguyen
authors.affiliation: NASA Johnson Space Center Microbiology Laboratory, Houston, TX 77058, USA.
authors.forename: Sarah L
authors.initials: SL
authors.lastname: Castro
authors.affiliation: Department of Civil and Environmental Engineering, University of Houston, Houston, TX 77204-4003, USA. Electronic address: dfrigirodrigues@uh.edu.
authors.forename: Debora F
authors.initials: DF
authors.lastname: Rodrigues
mesh_terms: D044822:Biodiversity; D002119:Calcium Carbonate / Q000737:chemistry*; D002245:Carbon Dioxide / Q000378:metabolism*; D057965:Carbon Sequestration; D059552:Caves; D011232:Chemical Precipitation; D059013:Microbial Consortia / Q000235:genetics / Q000502:physiology*; D014421:Turkey
chemical_list: D002245:Carbon Dioxide; D002119:Calcium Carbonate
keywords: Bacterial consortia; CO(2) sequestration; Cave; Microbially-induced carbonate precipitation; Travertine; Urease activity