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Evaluation of the hydrolytic–acidogenic step of a two-stage mesophilic anaerobic digestion process of sunflower oil cake

AuthorsRubia, M. Ángeles de la ; Raposo Bejines, Francisco ; Rincón, Bárbara ; Borja Padilla, Rafael
KeywordsHydraulic retention time (HRT)
Organic loading rate (OLR)
Sunflower oil cake (SuOC)
Two.stage anaerobic digestion (TSAD)
Hydrolytic-acodigenic stage
Issue DateSep-2009
CitationBioresource Technology 100(18): 4133-4138 (2009)
AbstractThe influence of the hydraulic retention time (HRT) and organic loading rate (OLR) on the performance of the hydrolytic–acidogenic step of a two-stage anaerobic digestion process of sunflower oil cake (SuOC) were assessed. The experiments were performed in laboratory-scale completely stirred tank reactors at mesophilic (35 °C) temperature. Six OLR (ranging from 4 to 9 g VS L−1 d−1) for four HRTs (8, 10, 12 and 15 days) were tested to check the effect of each operational variable. Based on the results obtained, it can be concluded that the hydrolysis yields obtained for all HRTs and OLRs assayed were in the range of 20.5–30.1%. In addition, the acidification degree of the substrate was mainly influenced by the OLR but not by the HRTs, the highest value (83.8%) being achieved for an HRT of 10 days and an OLR of 6 g VS L−1 d−1.
Publisher version (URL)http://dx.doi.org/10.1016/j.biortech.2009.04.001
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