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.
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| http://dx.doi.org/10.1016/j.biortech.2019.121638 | DOI Listing |
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Article Synopsis
- This study explores how bauxite mining impacts soil quality and microbial health in mining-adjacent areas, which has been under-researched compared to other types of mining like coal and copper.
- Soil samples from locations near an active bauxite mine showed high levels of heavy metals (like chromium and lead), acidity, and aluminum, negatively affecting important microbial indicators such as enzyme activity and microbial biomass.
- The research found that the concentrations of organic carbon could help mitigate some of the acidity effects, with acid phosphatase enzyme being a key factor in differences seen across various sampling sites.
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