4.7 Article

Sulfur-oxidizing bacteria in full-scale biogas cleanup system of ethanol industry

Journal

RENEWABLE ENERGY
Volume 150, Issue -, Pages 965-972

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2019.11.140

Keywords

Hydrogen sulfide; Sulfur-oxidizing bacteria; 16S rRNA gene; Next-generation sequencing; Ethanol industry

Funding

  1. Research and Researchers for Industries [PHD60I0028]
  2. King Mongkut's University of Technology North Bangkok [KMUTNB-62-KNOW-07]
  3. Royal Academy of Engineering-Industry Academy Partnership Program [IAPP1617\9]
  4. Thailand Research Fund [DBG6280001]
  5. Royal Society-Newton Advanced Fellowship [NAF\R2\180513]
  6. Joint Graduate School of Energy and Environment, King Mongkut's University of Technology Thonburi [JGSEE 739]

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Biogas from distillery anaerobic digesters in the ethanol industry consist of hydrogen sulfide (H2S) at concentrations up to 12,000 ppm. Before being used as a feed for an electrical generator H2S levels need to be reduced to concentrations below 100 ppm. H2S removal performance depends on the activity of sulfur-oxidizing bacteria (SOB). Next Generation Sequencing (NGS) analysis of samples collected from the bioscrubber with 3 different samples including starting seed (TRE1), recirculating liquid (TRE2), bioscrubber plastic media (TRE3) were taken. Genera Fastidiosipila belonging to the phylum Firmicutes was dominant in the starting seed, while genera Pseudomonas, MWH UniP1_aquatic_group, Hydrogenophaga belonging to phyla Proteobacteria were dominant in the bioscrubber. Pseudomonas anguilliseptica (33%) and Pseudomonas alcaligenes (18%) were the major members of facultative chemoautotrophic SOB in the bioscrubber. Two species of SOB were isolated using a selective culture medium technique including Sphingobium yanoikuyae and Enhydrobacter aerosaccus. (C) 2019 Elsevier Ltd. All rights reserved.

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