title: Dynamic effect of total solid content, low substrate/inoculum ratio and particle size on solid-state anaerobic digestion.
abstract: Among all the process parameters of solid-state anaerobic digestion (SS-AD), total solid content (TS), inoculation (S/X ratio) and size of the organic solid particles can be optimized to improve methane yield and process stability. To evaluate the effects of each parameter and their interactions on methane production, a three level Box-Behnken experimental design was implemented in SS-AD batch tests degrading wheat straw by adjusting: TS content from 15% to 25%, S/X ratio (in volatile solids) between 28 and 47 and particle size with a mean diameter ranging from 0.1 to 1.4mm. A dynamic analysis of the methane production indicates that the S/X ratio has only an effect during the start-up phase of the SS-AD. During the growing phase, TS content becomes the main parameter governing the methane production and its strong interaction with the particle size suggests the important role of water compartmentation on SS-AD.
authors.affiliation: INRA, UR0050, Laboratoire de Biotechnologie de l'Environnement, Narbonne, France.
authors.forename: J-C
authors.initials: JC
authors.lastname: Motte
authors.forename: R
authors.initials: R
authors.lastname: Escudié
authors.forename: N
authors.initials: N
authors.lastname: Bernet
authors.forename: J-P
authors.initials: JP
authors.lastname: Delgenes
authors.forename: J-P
authors.initials: JP
authors.lastname: Steyer
authors.forename: C
authors.initials: C
authors.lastname: Dumas
mesh_terms: D000222:Adaptation, Physiological; D000693:Anaerobiosis; D001419:Bacteria / Q000254:growth & development / Q000378:metabolism*; D001673:Biodegradation, Environmental; D005591:Chemical Fractionation; D005232:Fatty Acids, Volatile / Q000032:analysis; D008697:Methane / Q000032:analysis; D010316:Particle Size; D012037:Refuse Disposal / Q000379:methods*; D062611:Solid Waste / Q000032:analysis*; D014908:Triticum / Q000737:chemistry; D014835:Volatilization
chemical_list: D005232:Fatty Acids, Volatile; D062611:Solid Waste; D008697:Methane
keywords: Dry anaerobic digestion; Lignocellulosic residue; Particle size; Substrate/inoculum ratio; Total solid content