Saha, Shouvik and Jeon, Byong-Hun and Kurade, Mayur B. and Govindwar, Sanjay P. and Chatterjee, Pradip K. and Oh, Sang-Eun and Roh, Hyun-Seog and Lee, Sean S. (2019) Interspecies microbial nexus facilitated methanation of polysaccharidic wastes. Bioresource Technology, 289 (121638).

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Compositional variations in organic wastes influence microbial abundancy and syntrophy during anaerobic digestion (AD), impacting the normal performance of digesters for methanation. Investigation of the microbial dynamics during AD following augmentation with polysaccharidic wastes (PW) revealed the association of effective digester performance and methane yields with the microbial nexus. Dominance of the acidogenic saccharolytic genera, Prevotella, Eubacterium, and Lachnoclostridium, enhanced the utilization of carbohydrates (54%) in PW-augmented digesters. Spearman’s rs correlation showed dynamic interspecies interactions among acetogenic syntrophs, and that of iron oxidizers/reducers with acetoclastic and hydrogenotrophic methanogens. Propionate oxidizers in Chloroflexi (i.e., Bellilinea, Levilinea, and Longilinea) exhibited positive associations with acetoclastic methanogens. Increase in the population of acetoclastic methanogens (Methanosaeta, 77% and Methanosarcina, 9%) accelerated the methanogenic activity of PW-augmented digesters by 7 times during the exponential phase, increasing the methane yield (75%) compared to the control. Thus, microbial syntrophy facilitated the effective methanation of PW during AD process.

Item Type: Article
Subjects: Biomethanation
Depositing User: Dr. Arup Kr. Nandi
Date Deposited: 15 Jan 2021 06:02
Last Modified: 15 Jan 2021 06:02

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