title: Syntrophic acetate oxidation in industrial CSTR biogas digesters.
abstract: The extent of syntrophic acetate oxidation (SAO) and the levels of known SAO bacteria and acetate- and hydrogen-consuming methanogens were determined in sludge from 13 commercial biogas production plants. Results from these measurements were statistically related to the prevailing operating conditions, through partial least squares (PLS) analysis. This revealed that high abundance of microorganisms involved in SAO was positively correlated with relatively low abundance of aceticlastic methanogens and high concentrations of free ammonia (>160 mg/L) and volatile fatty acids (VFA). Temperature was identified as another influencing factor for the population structure of the syntrophic acetate oxidising bacteria (SAOB). Overall, there was a high abundance of SAOB in the different digesters despite differences in their operating parameters, indicating that SAOB are an enduring and important component of biogas-producing consortia.
authors: Uppsala Biocenter, Department of Microbiology, Swedish University of Agricultural Sciences, Box 7025, SE 750 07 Uppsala, Sweden. Electronic address: Li.Sun@slu.se.
authors: Li
authors: L
authors: Sun
authors: Uppsala Biocenter, Department of Microbiology, Swedish University of Agricultural Sciences, Box 7025, SE 750 07 Uppsala, Sweden. Electronic address: Bettina.Muller@slu.se.
authors: Bettina
authors: B
authors: Müller
authors: Uppsala Biocenter, Department of Microbiology, Swedish University of Agricultural Sciences, Box 7025, SE 750 07 Uppsala, Sweden. Electronic address: Maria.Westerholm@slu.se.
authors: Maria
authors: M
authors: Westerholm
authors: Uppsala Biocenter, Department of Microbiology, Swedish University of Agricultural Sciences, Box 7025, SE 750 07 Uppsala, Sweden. Electronic address: Anna.Schnurer@slu.se.
authors: Anna
authors: A
authors: Schnürer
mesh_terms: D000085:Acetates / Q000032:analysis / Q000378:metabolism*; D000704:Analysis of Variance; D001105:Archaea / Q000378:metabolism* / Q000502:physiology; D056804:Biofuels; D019149:Bioreactors / Q000382:microbiology*; D010084:Oxidation-Reduction
chemical_list: D000085:Acetates; D056804:Biofuels
keywords: Industrial biogas production; Methanogens; Operating parameters; Syntrophic acetate oxidising bacteria