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Effect of process temperature on bacterial and archaeal communities in two methanogenic bioreactors treating organic household waste.
It was not only the species richness that was affected by temperature, but also the phylogenetic distribution of the microbial populations, suggesting a higher diversity compared to the community present at the thermophilic temperature. Expand
Ammonia, a selective agent for methane production by syntrophic acetate oxidation at mesophilic temperature.
The shift to SAO in the biogas digester resulted in a twofold decrease in the specific gas and methane yield, and the pathway for methane formation was determined by calculating the (14)CO(2)/(14)CH(4) ratio after incubating samples with ( 14)C-2-acetate. Expand
Mesophilic syntrophic acetate oxidation during methane formation in biogas reactors
The reaction pathway for the formation of methane from acetate was investigated in sludge from 13 different biogas reactors and it was shown that methane formation by syntrophic acetate oxidation was the dominating mechanism for acetotrophic methanogenesis inSludge containing high levels of salts, mainly ammonium, and volatile acids. Expand
Quantification of syntrophic acetate-oxidizing microbial communities in biogas processes
Changes in communities of syntrophic acetate-oxidizing bacteria (SAOB) and methanogens caused by elevated ammonia levels were quantified in laboratory-scale methanogenic biogas reactors operating atExpand
Impact of trace element addition on degradation efficiency of volatile fatty acids, oleic acid and phenyl acetate and on microbial populations in a biogas digester.
Results show that the added trace elements affected the ability of the microflora to degrade VFAs as well as oleic acid and phenyl acetate in a community, where acetate utilization is dominated by SAO. Expand
Improved bio-energy yields via sequential ethanol fermentation and biogas digestion of steam exploded oat straw.
Using standard laboratory equipment, thermochemically pretreated oat straw was enzymatically saccharified and fermented to ethanol, and after removal of ethanol the remaining material was subjected toBiogas digestion, suggesting that the ethanol process acts as an additional pretreatment for the biogas process. Expand
Tepidanaerobacter acetatoxydans sp. nov., an anaerobic, syntrophic acetate-oxidizing bacterium isolated from two ammonium-enriched mesophilic methanogenic processes.
The genetic and phenotypic properties of strains Re1(T), Re2, T1 and T2 suggest classification as representatives of a novel species of the genus Tepidanaerobacter; the name Tepicutes-Clostridia acetatoxydans sp. Expand
Syntrophaceticus schinkii gen. nov., sp. nov., an anaerobic, syntrophic acetate-oxidizing bacterium isolated from a mesophilic anaerobic filter.
Based on the phylogenetic position and the physiological characteristics of strain Sp3(T), this new syntrophic, acetate-oxidizing bacterium is proposed as the new genus and species Syntrophaceticus schinkii, with Sp3 (T) (=JCM 16669(T)) as the type strain. Expand
Biogas production through syntrophic acetate oxidation and deliberate operating strategies for improved digester performance
This review summarises current insight of syntrophic acetate oxidising microorganisms, their presence and the detection of novel species and relate these observations with operating conditions of the biogas processes in order to explore contributing factors for development of an ammonia-tolerant microbial community that efficiently degrades acetate through the syntrophic pathway. Expand
Bioaugmentation of Syntrophic Acetate-Oxidizing Culture in Biogas Reactors Exposed to Increasing Levels of Ammonia
The findings further demonstrate the strong influence of ammonia on the methane-producing consortia and on the representative methanization pathway in mesophilic biogas reactors. Expand