title: Acidogenic fermentation of Scenedesmus sp.-AMDD: Comparison of volatile fatty acids yields between mesophilic and thermophilic conditions.
abstract: This study compared the acidogenic fermentation of Scenedesmus sp.-AMDD at laboratory-scale, under mesophilic (35°C) and thermophilic conditions (55°C). Preliminary batch tests were performed to evaluate best conditions for volatile fatty acid (VFA) production from microalgal biomass, with respect to the inoculum, pH and nutrients. The use of bovine manure as inoculum, the operating pH of 4.5 and the addition of a nutrient mix, resulted in a high VFA production of up to 222mgg(-1) total volatile solid (TVS), with a butyrate share of 27%. Both digesters displayed similar hydrolytic activity with 0.38±0.02 and 0.42±0.03 g soluble chemical oxygen demand (COD)g(-1) TVS for the digesters operated at 35 and 55°C, respectively. Mesophilic conditions were more favorable for VFA production, which reached 171±5, compared to 88±12 mg soluble CODg(-1) TVS added under thermophilic conditions (94% more). It was shown that in both digesters, butyrate was the predominant VFA.
authors.affiliation: Department of Waste Management, Brandenburg University of Technology, 03013 Cottbus, Germany.
authors.forename: Marvin
authors.initials: M
authors.lastname: Gruhn
authors.affiliation: Energy, Mining and Environment, National Research Council Canada, 6100 Royalmount, Montreal H4P 2R2, Canada.
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Frigon
authors.affiliation: Energy, Mining and Environment, National Research Council Canada, 6100 Royalmount, Montreal H4P 2R2, Canada. Electronic address: serge.guiot@canada.ca.
authors.forename: Serge R
authors.initials: SR
authors.lastname: Guiot
mesh_terms: D000143:Acids / Q000494:pharmacology*; D000818:Animals; D057919:Biological Oxygen Demand Analysis; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology; D002417:Cattle; D005232:Fatty Acids, Volatile / Q000378:metabolism*; D005285:Fermentation / Q000187:drug effects; D006859:Hydrogen / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D008372:Manure; D008697:Methane / Q000378:metabolism; D058086:Microalgae / Q000378:metabolism; D044444:Scenedesmus / Q000187:drug effects / Q000378:metabolism*; D013696:Temperature; D013997:Time Factors; D014865:Waste Disposal, Fluid
chemical_list: D000143:Acids; D005232:Fatty Acids, Volatile; D008372:Manure; D006859:Hydrogen; D008697:Methane
keywords: Anaerobic digestion; Carboxylic acid; Fatty acids; Microalgae; Scenedesmus