4.6 Article

Impacts of conductive materials on microbial community during syntrophic propionate oxidization for biomethane recovery

期刊

WATER ENVIRONMENT RESEARCH
卷 93, 期 1, 页码 84-93

出版社

WILEY
DOI: 10.1002/wer.1357

关键词

co-occurrence network; direct interspecies electron transfer (DIET); microbial community analysis; room temperature anaerobic digestion; syntrophic propionate oxidization

资金

  1. Natural Sciences and Engineering Research Council of Canada (NSERC) Strategic Partnership Grants for Projects (SPG-P), an NSERC Industrial Research Chair (IRC) Program in Sustainable Urban Water Development through the EPCOR Water Services
  2. EPCOR Drainage Operation
  3. Alberta Innovates
  4. Waterwerx
  5. Canada Research Chair (CRC) in Future Community Water Services
  6. China Scholarship Council (CSC)

向作者/读者索取更多资源

DIET can enhance syntrophic propionate oxidization efficiency under room temperature conditions (20 degrees C). The microbial communities in GAC- and magnetite-supplemented reactors were similar, but different from the control reactor. Co-occurrence network revealed the syntrophic propionate-oxidizing bacteria and methanogenesis partners, such as Methanobacterium correlated with Smithella, Syntrophobacter, Dechloromonas, and Trichococcus.
Propionate is one of the most important intermediates in anaerobic digestion, and its degradation requires a syntrophic partnership between propionate-oxidizing bacteria and hydrogenotrophic methanogens. Anaerobic digestion efficiency can be improved by direct interspecies electron transfer (DIET) through conductive materials. This study aimed to investigate the effects of DIET on syntrophic propionate oxidization under room temperature (20 degrees C) and reveal the syntrophic partners. Firstly, conventional anaerobic consortium and conductive material-enriched consortium were tested for DIET under high H-2 partial pressure. The latter supplemented with granular activated carbon (GAC) can mitigate H-2 inhibition through DIET. Secondly, a DIET consortium was enriched for testing GAC and magnetite, both showed DIET facilitation. Microbial communities in GAC- and magnetite-supplemented reactors were similar. Syntrophic propionate-oxidizing bacteria, for example, Smithella (3.9%-9.9%) and a genus from the family Syntrophaceae (1.9%-3.6%) and methanogens Methanobacterium (30.3%-75.2%), Methanolinea (8.5%-25.2%), Methanosaeta (11.4%-36.7%), and Candidatus Methanofastidiosum (3.6%-6.6%), were predominant. Functional genes for cell mobility and membrane transport (3.3% and 9.5% in control reactor) increased with GAC (3.7% and 11.1%, respectively) and magnetite (3.7% and 10.9%, respectively) addition. Syntrophic propionate-oxidizing bacteria and methanogenesis partners were revealed by co-occurrence network, for example, Methanobacterium with Smithella, Syntrophobacter, Dechloromonas, and Trichococcus, signifying the importance of the syntrophic partnership in DIET environment. Practitioner points DIET improved syntrophic propionate oxidization under room temperature condition (20 degrees C). Microbial communities were similar for GAC- and magnetite-supplemented reactors, different with control reactor. Syntrophic propionate-oxidizing bacteria and methanogenesis partners were revealed by co-occurrence network. Methanobacterium and Smithella, Syntrophobacter, Dechloromonas, and Trichococcus were correlated.

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