Abstract
The microbial community structure of twenty-one single-phase and one two-phase full-scale anaerobic sewage sludge digesters was evaluated using oligonucleotide probes complementary to conserved tracts of the 16S rRNAs of phylogenetically defined groups of methanogens and sulfate-reducing bacteria. These probe results were interpreted in combination with results from traditional chemical analyses and metabolic activity assays. It was determined that methanogens in “healthy” mesophilic, single-phase sewage sludge digesters accounted for approximately 8–12% of the total community and thatMethanosarcinales andMethanomicrobiales constituted the majority of the total methanogen population.Methanobacteriales andMethanococcales played a relatively minor role in the digesters. Phylogenetic groups of mesophilic, Gram-negative sulfate-reducing bacteria were consistently present at significant levels:Desulfovibrio andDesulfobulbus spp. were the dominant sulfate-reducing populations,Desulfobacter andDesulfobacterium spp. were present at lower levels, andDesulfosarcina, Desulfococcus, andDesulfobotulus spp. were absent. Sulfate reduction by one or more of these populations played a significant role in all digesters evaluated in this study. In addition, sulfate-reducing bacteria played a role in favoring methanogenesis by providing their substrates. The analysis of the two-phase digester indicated that true phase separation was not accomplished: significant levels of active methanogens were present in the first phase. It was determined that the dominant populations in the second phase were different from those in the single-phase digesters.
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Raskin, L., Zheng, D., Griffin, M.E. et al. Characterization of microbial communities in anaerobic bioreactors using molecular probes. Antonie van Leeuwenhoek 68, 297–308 (1995). https://doi.org/10.1007/BF00874140
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DOI: https://doi.org/10.1007/BF00874140