Establishment of syntrophic methanogenic consortia (SMC) in different sludges from various full-scale biogas plants using sodium propionate
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Author list: Suraraksa B.; Hudayah N.; Boonapatcharoen N.; Kongduan V.; Phalaphol D.; Suksong W.; Kusonmano K.; Tanticharoen M.; Kuroda K.; Yamaguchi T.; Hatamoto M.
Publication year: 2025
Journal acronym: J Environ Chem Eng
Volume number: 13
Issue number: 2
ISSN: 22133437
Languages: English-Great Britain (EN-GB)
Abstract
To establish syntrophic methanogenic consortia (SMC) from microbial inocula obtained from various full-scale biogas plants and evaluate their potential to enhance methane production, sodium propionate was used as the sole substrate. The performance of the established consortia was determined based on the propionate utilization rate (PUR) and specific methanogenic activity (SMA). The targeted microorganisms involved in the syntrophic association of propionate degradation were quantified. High-throughput sequencing was used to analyze the dominant microorganisms at the end of the establishment process. The SMCs established from different seed sludges utilized propionate at a concentration of 3.0 g COD/L without any inhibition. Although established consortia from different sources showed a high SMA resulting in achieving 65–80 % methane (CH₄) content, their microbial communities were different. Thermovirga spp. were dominant in established consortia from seafood factory, while Smithella spp. were detected as the dominant species in other sources. The major hydrogenotrophic and acetoclastic methanogens consisted of the orders Methanomicrobiales and Methanosaeta spp., which respond to methane production. © 2025 Elsevier Ltd
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