title: Reduction of the hydraulic retention time at constant high organic loading rate to reach the microbial limits of anaerobic digestion in various reactor systems.
abstract: The effects of hydraulic retention time (HRT) reduction at constant high organic loading rate on the activity of hydrogen-producing bacteria and methanogens were investigated in reactors digesting thin stillage. Stable isotope fingerprinting was additionally applied to assess methanogenic pathways. Based on hydA gene transcripts, Clostridiales was the most active hydrogen-producing order in continuous stirred tank reactor (CSTR), fixed-bed reactor (FBR) and anaerobic sequencing batch reactor (ASBR), but shorter HRT stimulated the activity of Spirochaetales. Further decreasing HRT diminished Spirochaetales activity in systems with biomass retention. Based on mcrA gene transcripts, Methanoculleus and Methanosarcina were the predominantly active in CSTR and ASBR, whereas Methanosaeta and Methanospirillum activity was more significant in stably performing FBR. Isotope values indicated the predominance of aceticlastic pathway in FBR. Interestingly, an increased activity of Methanosaeta was observed during shortening HRT in CSTR and ASBR despite high organic acids concentrations, what was supported by stable isotope data.
authors: Department of Microbiology, Kazan (Volga Region) Federal University, Kazan 420008, The Republic of Tatarstan, Russia.
authors: Ayrat M
authors: AM
authors: Ziganshin
authors: Department of Biochemical Conversion, Deutsches Biomasseforschungszentrum gGmbH, 04347 Leipzig, Germany; Faculty of Agricultural and Environmental Sciences, University of Rostock, 18059 Rostock, Germany.
authors: Thomas
authors: T
authors: Schmidt
authors: Department of Environmental Microbiology, Helmholtz Centre for Environmental Research - UFZ, 04318 Leipzig, Germany.
authors: Zuopeng
authors: Z
authors: Lv
authors: Department of Biochemical Conversion, Deutsches Biomasseforschungszentrum gGmbH, 04347 Leipzig, Germany.
authors: Jan
authors: J
authors: Liebetrau
authors: Department of Isotope Biogeochemistry, Helmholtz Centre for Environmental Research - UFZ, 04318 Leipzig, Germany.
authors: Hans Hermann
authors: HH
authors: Richnow
authors: Department of Environmental Microbiology, Helmholtz Centre for Environmental Research - UFZ, 04318 Leipzig, Germany.
authors: Sabine
authors: S
authors: Kleinsteuber
authors: Department of Environmental Microbiology, Helmholtz Centre for Environmental Research - UFZ, 04318 Leipzig, Germany. Electronic address: marcell.nikolausz@ufz.de.
authors: Marcell
authors: M
authors: Nikolausz
mesh_terms: D000693:Anaerobiosis; D001419:Bacteria / Q000235:genetics / Q000378:metabolism; D056804:Biofuels; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology*; D001709:Biotechnology / Q000295:instrumentation / Q000379:methods; D000068016:Eubacteriales / Q000235:genetics / Q000378:metabolism; D006859:Hydrogen / Q000378:metabolism*; D008697:Methane / Q000096:biosynthesis*; D017020:Methanosarcina / Q000235:genetics / Q000378:metabolism; D059013:Microbial Consortia / Q000502:physiology*; D013144:Spirochaetales / Q000235:genetics / Q000378:metabolism
chemical_list: D056804:Biofuels; D006859:Hydrogen; D008697:Methane
keywords: Biogas; Fe–Fe-hydrogenases; Methanogenic activity; Stable isotope fingerprinting; Thin stillage