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Effect of co-substrate feeding on methane yield of anaerobic digestion of <Emphasis Type="Italic">Chlorella vulgaris</Emphasis>
Authors:Tamás Rétfalvi  Piroska Szabó  Annamária-Tukacs Hájos  Levente Albert  Attila Kovács  Gábor Milics  Miklós Neményi  Erika Lakatos  Vince Ördög
Institution:1.Faculty for Forestry, Institute of Chemistry,University of West Hungary,Sopron,Hungary;2.Institute for Biosystems Engineering,University of West Hungary Faculty of Agricultural and Food Science,Sopron,Hungary;3.Faculty of Agricultural and Food Science, Institute of Plant Biology,University of West Hungary,Sopron,Hungary
Abstract:Microalgal production has many advantages over the use of terrestrial plants; therefore, increases in the use of microalgae for energy production can be expected. Algal biomass can be processed anaerobically to methane; however, the unfavorable C/N ratio of the substrate may have an inhibitory effect. The impact of the application of used cooking oil, maize silage, and mill residue on anaerobic co-digestion of the microalgal Chlorella vulgaris was studied in semi-continuous, laboratory-scale digestion. During the full period of the trial involving anaerobic digestion of algae in the case of mono-digestion and co-digestion with used cooking oil, maize silage, and mill residue, the volumetric methane yields were 0.38?±?0.07, 1.56?±?0.26, 1.19?±?0.18, and 1.16?±?0.13 L L?1, respectively. Trials were carried out to determine the long-term effect of the total solid (TS) content of substrates (co-digestion of C. vulgaris and used cooking oil at 3.8 and 7.2 % of TS, respectively). Both designs could be increased to 5.5 g VS L?1 d?1, but a higher TS% resulted in increased methane production and a longer period of decline in the methane yield due to washout. The sharp decrease in methane content at the end of 90 days was accompanied by a reorganization of the methanogenic archaeal community.
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