title: Assessment of two-phase olive mill solid waste and microalgae co-digestion to improve methane production and process kinetics.
abstract: Olive mill solid waste (OMSW) is a pollutant waste coming from olive oil elaboration by the two-phase centrifugation system. OMSW has a high organic matter content and unbalanced carbon to nitrogen (C/N) ratio, 31/1, which avoids obtaining high methane yields in the anaerobic digestion of this waste. In the present study a microalgae, Dunaliella salina, was employed as co-substrate for the OMSW anaerobic digestion in order to decrease the C/N ratio and increase its biodegradability. Different co-digestion mixtures (C/N ratios) were studied. The increase of D. salina from 25% to 50% in the co-digestion mixture clearly increased the biodegradability of the sole substrates. The highest biodegradability was found for the co-digestion mixture 50% OMSW-50% D. salina. Nevertheless, the maximum methane production, 330mLCH4/gVSadded, and the highest methane production rate were obtained for the co-digestion mixture 75% OMSW-25% D. salina, keeping a C/N ratio near to 26.7/1.
authors.affiliation: Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (C.S.I.C.), Avenida Padre García Tejero, 4, 41012 Sevilla, Spain; Departamento de Sistemas Físicos y Naturales, Universidad Pablo de Olavide, Ctra. de Utrera, km 1, 41013 Sevilla, Spain.
authors.forename: M J
authors.initials: MJ
authors.lastname: Fernández-Rodríguez
authors.affiliation: Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (C.S.I.C.), Avenida Padre García Tejero, 4, 41012 Sevilla, Spain. Electronic address: brlloren@cica.es.
authors.forename: B
authors.initials: B
authors.lastname: Rincón
authors.affiliation: Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (C.S.I.C.), Avenida Padre García Tejero, 4, 41012 Sevilla, Spain.
authors.forename: F G
authors.initials: FG
authors.lastname: Fermoso
authors.affiliation: Departamento de Sistemas Físicos y Naturales, Universidad Pablo de Olavide, Ctra. de Utrera, km 1, 41013 Sevilla, Spain.
authors.forename: A M
authors.initials: AM
authors.lastname: Jiménez
authors.affiliation: Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (C.S.I.C.), Avenida Padre García Tejero, 4, 41012 Sevilla, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Borja
mesh_terms: D001673:Biodegradation, Environmental; D001709:Biotechnology / Q000379:methods*; D007220:Industrial Waste / Q000032:analysis*; D007700:Kinetics; D016015:Logistic Models; D008697:Methane / Q000096:biosynthesis*; D058086:Microalgae / Q000378:metabolism*; D031658:Olea / Q000737:chemistry*; D062611:Solid Waste / Q000032:analysis*
chemical_list: D007220:Industrial Waste; D062611:Solid Waste; D008697:Methane
keywords: Biochemical methane potential; Co-digestion; Kinetics; Microalgae; Olive mill solid waste