期刊
BIORESOURCE TECHNOLOGY
卷 360, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127574
关键词
Anaerobicdigestion; Methanogenesis; Syntrophicoxidation; Propionateaccumulation; Ammoniastress
资金
- Nanyang Environment and Water Research Institute (NEWRI) , Nanyang Technological University
- National Natural Science Foundation of China [42006134]
- Shandong University Foundation for Future Scholar Plan
This study elucidated the ecological roles and interactions of microbial communities in thermophilic THP-AD reactors. It was found that Fir-micutes dominated the enriched microbial community, and methane production was primarily mediated by Methanosarcina and Methanothermobacter. The accumulation of propionate could be attributed to weak propionate-oxidizing activity or its absence.
The ecological roles of microbial communities and how they interact with each other in thermal hydrolysis process (THP) assisted thermophilic anaerobic digestion (THP-AD) reactors remain largely unknown, especially under propionate stress. Two thermophilic THP-AD reactors had methane yield of 240-248 mL/g VSadded, but accumulated approximately 2000 mg/L propionate. Genome-centric metagenomics analysis showed that 68 metagenome-assembled genomes (MAGs) were recovered, 32 MAGs of which were substantially enriched. Fir-micutes spp. dominated the enriched microbial community, including hydrolytic/fermentative bacteria and syntrophs. Methanogenic activities were mainly mediated by Methanosarcina sp. and Methanothermobacter spp. In addition to hydrogenotrophic methanogens, Thermodesulfovibrio sp. could also be a vital H-2 scavenger, contributing to maintaining low H-2 partial pressure in the bioreactors. The remarkable accumulation of propionate could be likely attributed to the weak syntrophic propionate-oxidizing activity or its absence. These findings advanced our knowledge about the mutualistic symbiosis of carbon metabolism in thermophilic THP-AD reactors.
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