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Assessment of two-phase olive mill solid waste and microalgae co-digestion to improve methane production and process kinetics

AuthorsFernández Rodríguez, M. J.; Rincón, Bárbara ; Fermoso, Fernando G. ; Jiménez-Rodríguez, A. M.; Borja Padilla, Rafael
olive mill solid waste
biochemical methane potential
Issue Date2014
CitationBioresource Technology 157: 263- 269 (2014)
AbstractOlive 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. © 2014 Elsevier Ltd.
Identifiersdoi: 10.1016/j.biortech.2014.01.096
issn: 0960-8524
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