title: The influence of different pretreatment methods on biogas production from Jatropha curcas oil cake.
abstract: Drought and pest resistance, together with high oil content in its seeds, make Jatropha curcas a good oil source for biodiesel. Oil cake from J. curcas is not suitable for animal feeding and thus may be profitably used for additional energy production by conversion into biogas; however, the anaerobic digestion process must be optimized to obtain good efficiency. We subjected oil cake to thermal and acidic pretreatment to deactivate protease inhibitors and partially hydrolyze phytate. We then digested the samples in batch conditions to determine the effects of pretreatment on biogas production. Thermal pretreatment changed the kinetics of anaerobic digestion and reduced protease inhibitor activity and the concentration of phytate; however, biogas production efficiency was not affected (0.281 m3kg-1). To evaluate the possibility of recirculating water for SSF hydrolysis, ammonium nitrogen recovery from effluent was evaluated by its precipitation in the form of struvite (magnesium ammonium phosphate).Concentration of ammonium ions was reduced by 53% (to 980 mg L-1). We propose a water-saving concept based on percolation of J. curcas cake using anaerobic digestion effluent and feeding that percolate into a methanogenic bioreactor.
authors.affiliation: Faculty of Biotechnology, University of Wroclaw, ul. Fryderyka Joliot-Curie 14a, 50-383 Wrocław, Poland.
authors.forename: Sławomir Jan
authors.initials: SJ
authors.lastname: Jabłoński
authors.affiliation: Wroclaw University of Technology, Faculty of Chemistry, Division of Fuel Chemistry and Technology, Gdańska 7/9, 50-344 Wroclaw, Poland.
authors.forename: Marek
authors.initials: M
authors.lastname: Kułażyński
authors.affiliation: Faculty of Biotechnology, University of Wroclaw, ul. Fryderyka Joliot-Curie 14a, 50-383 Wrocław, Poland.
authors.forename: Ilona
authors.initials: I
authors.lastname: Sikora
authors.affiliation: Faculty of Biotechnology, University of Wroclaw, ul. Fryderyka Joliot-Curie 14a, 50-383 Wrocław, Poland. Electronic address: Marcin.lukaszewicz@uwr.edu.pl.
authors.forename: Marcin
authors.initials: M
authors.lastname: Łukaszewicz
mesh_terms: D000821:Animal Feed; D000818:Animals; D056804:Biofuels; D019149:Bioreactors; D031286:Jatropha; D012639:Seeds
chemical_list: D056804:Biofuels
keywords: Biogas production; Jatropha curcas; Oil cake