title: Microalgae-bacteria flocs (MaB-Flocs) as a substrate for fermentative biogas production.
abstract: Biogas production from the microalgae-bacteria flocs (MaB-Flocs) in batch reactors was conducted in this study. A batch test was performed to determine optimum inoculums that were taken from a running biogas plant (BP), a municipal wastewater treatment plant (MWTP) and a river sediment (RS). The maximum biogas yield (304.83±4.23 mL per gram volatile solids introduced (mL g-VS(-1))) was obtained with the inoculum from MWTP. Subsequently, the effect of substrate-inoculum (S/I) ratios, temperature and pre-treatment methods on fermentative biogas and methane production was investigated. The optimum S/I ratios and incubation temperature were determined as 0.2 g VS(substrate)/g VS(inoculum) and 37±1°C, respectively. The results of the CH4 fermentation show that the methane yields could be increased from 216.72±3.52 mL CH4 g-VS(-1) to 271.34±6.65 mL g-VS(-1) by using enzymatic pre-treatment at the S/I ratio of 0.2 g VS(substrate)/g VS(inoculum) and mesophilic conditions.
authors.affiliation: TUHH - Hamburg University of Technology, Institute of Environmental Technology and Energy Economics, Waste Resources Management, Harburger Schloßstr. 36, 21079 Hamburg, Germany.
authors.forename: Nils
authors.initials: N
authors.lastname: Wieczorek
authors.affiliation: TUHH - Hamburg University of Technology, Institute of Environmental Technology and Energy Economics, Waste Resources Management, Harburger Schloßstr. 36, 21079 Hamburg, Germany.
authors.forename: Mehmet Ali
authors.initials: MA
authors.lastname: Kucuker
authors.affiliation: TUHH - Hamburg University of Technology, Institute of Environmental Technology and Energy Economics, Waste Resources Management, Harburger Schloßstr. 36, 21079 Hamburg, Germany. Electronic address: kuchta@tuhh.de.
authors.forename: Kerstin
authors.initials: K
authors.lastname: Kuchta
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D056804:Biofuels; D019149:Bioreactors / Q000382:microbiology*; D001709:Biotechnology / Q000379:methods; D005285:Fermentation; D019015:Geologic Sediments; D008697:Methane / Q000096:biosynthesis*; D058086:Microalgae / Q000378:metabolism*; D045483:Rivers; D013696:Temperature; D014865:Waste Disposal, Fluid; D062065:Wastewater
chemical_list: D056804:Biofuels; D008697:Methane; D062065:Wastewater
keywords: Anaerobic digestion; Biogas production; Inoculum source; Microalgae-bacteria flocs (MaB-Flocs); Pre-treatment