Anaerobic digestion of sunflower oil cake: a current overview.

M A De la Rubia, V Fernández-Cegrí, F Raposo, R Borja

Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (CSIC), Avenida Padre García Tejero, 4 41012 Seville, Spain. arubia@cica.es

Water science and technology : a journal of the International Association on Water Pollution Research 2013

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Due to the chemical and physical structure of a lignocellulosic biomass, its anaerobic digestion (AD) is a slow and difficult process. In this paper, the results obtained from a batch biochemical methane potential (BMP) test and fed-batch mesophilic AD assays of sunflower oil cake (SuOC) are presented. Taking into account the low digestibility shown during one-stage experiments the methane yield decreased considerably after increasing the organic loading rate (OLR) from 2 to 3 g VS L(-1) d(-1), SuOC was subjected to a two-stage AD process (hydrolytic-acidogenic and methanogenic stages), in two separate reactors operating in series where the methanogenic stage became acidified (with >1,600 mg acetic acid L(-1)) at an OLR as low as 2 g VS L(-1) d(-1). More recently, BMP assays were carried out after mechanical, thermal, and ultrasonic pre-treatments to determine the best option on the basis of the methane yield obtained.

Citation

M A De la Rubia, V Fernández-Cegrí, F Raposo, R Borja. Anaerobic digestion of sunflower oil cake: a current overview. Water science and technology : a journal of the International Association on Water Pollution Research. 2013;67(2):410-7