title: Evaluation of methane generation and process stability from anaerobic co-digestion of sugar beet by-product and cow manure.
abstract: The effect of mesophilic anaerobic co-digestion of dried pellets of exhausted sugar beet cossettes (ESBC-DP) and cow manure (CM) on the enhancement of methane generation and process stability were studied with the aim to select the best substrate mixture ratio. A series of batch experiments was conducted using the following five mixture ratios of ESBC-DP:CM: 0:100; 25:75; 50:50; 75:25 and 100:0. Best results were obtained from mixture ratios with ESBC-DP proportions in the range of 25-50%. Mixture ratio of 50:50 showed a specific methane production (SMP) increase of 81.4% and 25.5%, respectively, in comparison with mono-digestion of ESBC-DP and CM. Evolution of the indirect parameter named acidogenic substrate as carbon (ASC) could be used to provide more insight about the process stability of anaerobic digestion. ASC accumulation was observed in reactors with higher ESBC-DP proportions leading to a delay in VFAs consumption and conversion into methane.
authors.affiliation: Department of Chemical Engineering and Food Technology, Faculty of Sciences, Agrifood Campus of International Excellence (CeiA3), University of Cádiz, 11510 Puerto Real, Cadiz, Spain. Electronic address: kaoutar.aboudi@uca.es.
authors.forename: Kaoutar
authors.initials: K
authors.lastname: Aboudi
authors.affiliation: Department of Chemical Engineering and Food Technology, Faculty of Sciences, Agrifood Campus of International Excellence (CeiA3), University of Cádiz, 11510 Puerto Real, Cadiz, Spain. Electronic address: carlosjose.alvarez@uca.es.
authors.forename: Carlos José
authors.initials: CJ
authors.lastname: Álvarez-Gallego
authors.affiliation: Department of Chemical Engineering and Food Technology, Faculty of Sciences, Agrifood Campus of International Excellence (CeiA3), University of Cádiz, 11510 Puerto Real, Cadiz, Spain. Electronic address: luisisidoro.romero@uca.es.
authors.forename: Luis Isidoro
authors.initials: LI
authors.lastname: Romero-García
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D027461:Beta vulgaris / Q000737:chemistry / Q000378:metabolism*; D019149:Bioreactors; D001709:Biotechnology; D002417:Cattle; D008372:Manure; D008697:Methane / Q000032:analysis* / Q000096:biosynthesis* / Q000378:metabolism
chemical_list: D008372:Manure; D008697:Methane
keywords: Acidogenic substrate as carbon; Anaerobic co-digestion; Cow manure; Methane generation; Process stability; Sugar beet by-product