Inhibition of a biological sulfide oxidation under haloalkaline conditions by thiols and diorgano polysulfanes
Pawel Roman (Wageningen University & Research, Wetsus, European Centre of Excellence for Sustainable Water Technology)
Joanna Lipińska (Wetsus, European Centre of Excellence for Sustainable Water Technology, Warsaw University of Technology)
Martijn F.M. Bijmans (Wetsus, European Centre of Excellence for Sustainable Water Technology)
Dimitry Y. Sorokin (Russian Academy of Sciences, TU Delft - BT/Environmental Biotechnology)
Karel J. Keesman (Wetsus, European Centre of Excellence for Sustainable Water Technology, Wageningen University & Research)
Albert J.H. Janssen (Shell Global Solutions International B.V., Wageningen University & Research)
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Abstract
A novel approach has been developed for the simultaneous description of reaction kinetics to describe the formation of polysulfide and sulfate anions from the biological oxidation of hydrogen sulfide (H2S) using a quick, sulfide-dependent respiration test. Next to H2S, thiols are commonly present in sour gas streams. We investigated the inhibition mode and the corresponding inhibition constants of six thiols and the corresponding diorgano polysulfanes on the biological oxidation of H2S. A linear relationship was found between the calculated IC50 values and the lipophilicity of the inhibitors. Moreover, a mathematical model was proposed to estimate the biomass activity in the absence and presence of sulfurous inhibitors. The biomass used in the respiration tests originated from a full-scale biodesulfurization reactor. A microbial community analysis of this biomass revealed that two groups of microorganism are abundant, viz. Ectothiorhodospiraceae and Piscirickettsiaceae.