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Extremophiles

, Volume 17, Issue 3, pp 535–543 | Cite as

Isolation and characterization of two novel alkalitolerant sulfidogens from a Thiopaq bioreactor, Desulfonatronum alkalitolerans sp. nov., and Sulfurospirillum alkalitolerans sp. nov

  • D. Y. SorokinEmail author
  • T. P. Tourova
  • G. Muyzer
Original Paper

Abstract

Two obligately anaerobic sulfidogenic bacterial strains were isolated from the full-scale Thiopaq bioreactor in Lelystad (The Netherlands) removing H2S from biogas under oxygen-limiting and moderately haloalkaline conditions. Strain HSRB-L represents a dominant culturable sulfate-reducing bacterium in the reactor. It utilizes formate, H2 (with acetate as C-source) and lactate as e-donors, and sulfate, thiosulfate and sulfite as e-acceptors. It is haloalkalitolerant, with a pH range for lithotrophic growth from 7.5 to 9.7 (optimum at 8.5–9) and a salt range from 0.1 to 1.75 M total Na+ (optimum at 0.6 M). The strain is a member of the genus Desulfonatronum and is proposed as a novel species D. alkalitolerans. The second strain, strain HTRB-L1, represents a dominant thiosulfate/sulfur reducer in the reactor. It is an obligate anaerobe utilizing formate and H2 (with acetate as C-source), lactate, pyruvate and fumarate as e-donors, and thiosulfate (incomplete reduction), sulfur, arsenate and fumarate as e-acceptors. With lactate as e-donor it also grows as an ammonifyer in the presence of nitrate and nitrite. HTRB-L1 is haloalkalitolerant, with a pH range for lithotrophic growth from 7.1 to 9.7 (optimum at 8.5) and a salt range from 0.6 to 1.5 M total Na+ (optimum at 0.6 M). Phylogenetic analysis showed that strain HTRB-L1 is a novel species within the genus Sulfurospirillum (Epsilonproteobacteria) for which a name Sulfurospirillum alkalitolerans is proposed.

Keywords

Thiopaq bioreactor Sulfur-reducing Thiosulfate-reducing Alkalitolerant 

Notes

Acknowledgments

This work was supported by the RFBR Grant 13-04-00049 to DS, and by an Advanced ERC Grant to GM. We are grateful to Erik van Zessen for providing samples from the Thiopaq bioreactor.

Supplementary material

792_2013_538_MOESM1_ESM.pdf (140 kb)
Supplementary material 1 (PDF 139 kb)

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Copyright information

© Springer Japan 2013

Authors and Affiliations

  1. 1.Winogradsky Institute of MicrobiologyRussian Academy of SciencesMoscowRussia
  2. 2.Department of BiotechnologyDelft University of TechnologyDelftThe Netherlands
  3. 3.Department of Aquatic Microbiology, Institute for Biodiversity and Ecosystem DynamicsUniversity of AmsterdamAmsterdamThe Netherlands

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