title: Anaerobic digestion of grape pomace: Biochemical characterization of the fractions and methane production in batch and continuous digesters.
abstract: In this study, we have estimated the biogas and methane production from grape pomace (variety Cabernet Franc). The physical and chemical characteristics of the raw material were determined, and the structural polysaccharides were identified and analyzed by the Van Soest method. Batch anaerobic digestions were carried out to assess the methane production of the grape pomace, pulp and seeds. The obtained cumulative methane productions are 0.125, 0.165 and 0.052 Nm(3) kg COD(-1) for grape pomace, pulps and seeds, respectively. The effect of grinding on the methane potential of the substrates, as a mechanical pretreatment, was evaluated. We found that it increased the anaerobic biodegradability for grape pomace, pulp and seeds by 13.1%, 4.8% and 22.2%, respectively. On the other hand, the methane potential of the grape pomace was determined in a laboratory pilot plant (12L) continuously mixed with an organic loading rate of 2.5 kg COD m(3) d(-1) and a hydraulic retention time of 30 days. The corresponding biogas production was 6.43 × 10(-3) Nm(3) d(-1), with a methane content of 62.3%. Thus, the pilot plant's efficiency compared to that achieved in the batch process was 81.2%. Finally, a significant correlation was found between the biochemical content and methane production.
authors.affiliation: Univ. Bretagne Sud, FRE CNRS 3744, IRDL, F-56300 Pontivy, France; Centre d'Analyses et de Recherches, Unité de recherche Technologies et Valorisation Alimentaire, Faculté des Sciences, Université Saint-Joseph de Beyrouth, Beirut, Lebanon. Electronic address: jean.achkar@net.usj.edu.lb.
authors.forename: Jean H
authors.initials: JH
authors.lastname: El Achkar
authors.affiliation: Univ. Bretagne Sud, FRE CNRS 3744, IRDL, F-56300 Pontivy, France.
authors.forename: Thomas
authors.initials: T
authors.lastname: Lendormi
authors.affiliation: Centre d'Analyses et de Recherches, Unité de recherche Technologies et Valorisation Alimentaire, Faculté des Sciences, Université Saint-Joseph de Beyrouth, Beirut, Lebanon.
authors.forename: Zeina
authors.initials: Z
authors.lastname: Hobaika
authors.affiliation: Centre d'Analyses et de Recherches, Unité de recherche Technologies et Valorisation Alimentaire, Faculté des Sciences, Université Saint-Joseph de Beyrouth, Beirut, Lebanon.
authors.forename: Dominique
authors.initials: D
authors.lastname: Salameh
authors.affiliation: Centre d'Analyses et de Recherches, Unité de recherche Technologies et Valorisation Alimentaire, Faculté des Sciences, Université Saint-Joseph de Beyrouth, Beirut, Lebanon.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Louka
authors.affiliation: Centre d'Analyses et de Recherches, Unité de recherche Technologies et Valorisation Alimentaire, Faculté des Sciences, Université Saint-Joseph de Beyrouth, Beirut, Lebanon.
authors.forename: Richard G
authors.initials: RG
authors.lastname: Maroun
authors.affiliation: Univ. Bretagne Sud, FRE CNRS 3744, IRDL, F-56300 Pontivy, France.
authors.forename: Jean-Louis
authors.initials: JL
authors.lastname: Lanoisellé
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels / Q000032:analysis*; D019149:Bioreactors; D005525:Food-Processing Industry; D007220:Industrial Waste / Q000032:analysis*; D008697:Methane / Q000032:analysis*; D012037:Refuse Disposal; D027843:Vitis / Q000737:chemistry*; D018505:Waste Management / Q000379:methods*
chemical_list: D056804:Biofuels; D007220:Industrial Waste; D008697:Methane
keywords: Anaerobic digestion; Batch to continuous reactor; Biodegradability; Biogas; By-product valorization; Grape pomace