Pressure effects on sulfur-oxidizing activity of Thiobacillus thioparus.
Environ Microbiol Rep
; 13(2): 169-175, 2021 04.
Article
en En
| MEDLINE
| ID: mdl-33421329
ABSTRACT
Carbon capture and storage technologies are crucial for reducing carbon emission from power plants as a response to global climate change. The CarbFix project (Iceland) aims at examining the geochemical response of injected CO2 into subsurface reservoirs. The potential role of the subsurface biosphere has been little investigated up to now. Here, we used Thiobacillus thioparus that became abundant at the CarbFix1 pilot site after injection of CO2 and purified geothermal gases in basaltic aquifer at 400-800 m depth (4-8 MPa). The capacity of T. thioparus to produce sulfate, through oxidation of thiosulfate, was measured by Raman spectroscopy as a function of pressure up to 10 MPa. The results show that the growth and metabolic activity of T. thioparus are influenced by the initial concentration of the electron donor thiosulfate. It grows best at low initial concentration of thiosulfate (here 5 g.l-1 or 31.6 mM) and best oxidizes thiosulfate into sulfate at 0.1 MPa with a yield of 14.7 ± 0.5%. Sulfur oxidation stops at 4.3 ± 0.1 MPa (43 bar). This autotrophic specie can thereby react to CO2 and H2 S injection down to 430 m depth and may contribute to induced biogeochemical cycles during subsurface energy operations.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Thiobacillus
Idioma:
En
Revista:
Environ Microbiol Rep
Año:
2021
Tipo del documento:
Article
País de afiliación:
Francia