V. Vavilin, L. Lokshina, S. Rytov. Using kinetic isotope effect to evaluate the significance of the sequential and parallel steps: formation of microbial consortium during reversible anaerobic methane oxidation coupled with sulfate reduction

V. Vavilin, L. Lokshina, S. Rytov. Using kinetic isotope effect to evaluate the significance of the sequential and parallel steps: formation of microbial consortium during reversible anaerobic methane oxidation coupled with sulfate reduction. Water Science and Technology, 2019, vol. 79.11, p. 2056-2067

ABSTRACT

 

The purpose of this study was to describe the dynamics of anaerobic oxidation of methane (AOM)coupled with sulfate reduction (SR) using experimental data from a continuous incubation experiments published earlier in order to show that formation of consortia of anaerobic archaea (ANME) and Desulfosarcina-like bacteria (DSS) may have a significant effect on sulfur isotope fractionation. The dynamic simulation of reversible AOM by ANME coupled with SR by DSS was performed. This simulation took into account biomass growth and fractionation of stable isotopes of sulfur. Two kinetic schemes with and without ANMEю DSS consortium formation were tested. The respective models were applied at five influent methane concentrations. A good fit to experimental data was obtained only when assuming active ANME and DSS biomass accumulation. The assumption about incorporation of reversibility of anaerobic methane oxidation and sulfate reduction did not improve the model’s fit to experimental data. In accordance with both the models, sulfur isotope fractionation was smallest for the highest influent methane concentration. The model considering the formation of consortia of ANMEю DSS is proved to be more appropriate.

 

Vasily Vavilin (corresponding author)

Water Problems Institute,

Russian Academy of Sciences,

3 Gubkina str., Moscow 119333,

Russian Federation

E-mail: vavilin@iwp.ru

 

Key words | anaerobic methane oxidation with sulfate, consortium of ANME and DSS, dynamic

models, stoichiometry, sulfur isotope fractionation

Дата публикации: 2019

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