title: Optimization of biogas production from Sargassum sp. using a design of experiments to assess the co-digestion with glycerol and waste frying oil.
abstract: A design of experiments was adopted to assess the optimal conditions for methane production from the macroalgae Sargassum sp. co-digested with glycerol (Gly) and waste frying oil (WFO). Three variables were tested: % total solids of algae (%TSSargassumsp.), co-substrate concentration (gGly/WFOL(-1)), and co-substrate type (Gly or WFO). The biochemical methane potential (BMP) of Sargassum sp. was 181±1L CH4kg(-1) COD. The co-digestion with Gly and WFO increased the BMP by 56% and 46%, respectively. The methane production rate (k), showed similar behaviour as the BMP, increasing 38% and 19% with Gly and WFO, respectively. The higher BMP (283±18L CH4kg(-1) COD) and k (65.9±2.1L CH4kg(-1) CODd(-1)) was obtained in the assay with 0.5% TS and 3.0gGlyL(-1). Co-digestion with glycerol or WFO is a promising process to enhance the BMP from the macroalgae Sargassum sp.
authors.affiliation: CEB-Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal.
authors.forename: J V
authors.initials: JV
authors.lastname: Oliveira
authors.affiliation: CEB-Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal. Electronic address: madalena.alves@deb.uminho.pt.
authors.forename: M M
authors.initials: MM
authors.lastname: Alves
authors.affiliation: CEB-Centre of Biological Engineering, University of Minho, 4710-057 Braga, Portugal.
authors.forename: J C
authors.initials: JC
authors.lastname: Costa
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels; D002138:Calibration; D003296:Cooking; D004042:Dietary Fats, Unsaturated / Q000378:metabolism*; D005285:Fermentation; D005990:Glycerol / Q000737:chemistry / Q000378:metabolism*; D006868:Hydrolysis; D008697:Methane / Q000096:biosynthesis*; D012107:Research Design / Q000592:standards; D044647:Sargassum / Q000737:chemistry / Q000378:metabolism*; D012624:Seaweed / Q000737:chemistry / Q000378:metabolism
chemical_list: D056804:Biofuels; D004042:Dietary Fats, Unsaturated; D008697:Methane; D005990:Glycerol
keywords: Anaerobic co-digestion; Design of experiments; Glycerol; Sargassum sp.; Waste frying oil