title: Anaerobic co-digestion of solid waste: Effect of increasing organic loading rates and characterization of the solubilised organic matter.
abstract: The impact of stepwise increase in OLR (up to 7.5kgVS/m(3)d) on methane production, reactor performance and solubilised organic matter production in a high-loading reactor were investigated. A reference reactor operated at low OLR (<2.0kgVS/m(3)d) was used solely to observe the methane potential of the feed substrate. Specific methane yield was 0.33lCH(4)/gVS at the lowest OLR and dropped by about 20% at the maximum OLR, while volumetric methane production increased from 0.35 to 1.38m(3)CH(4)/m(3)d. At higher loadings, solids hydrolysis was affected, with consequent transfer of poorly-degraded organic material into the drain solids. Biodegradability and size-fractionation of the solubilised COD were characterized to evaluate the possibility of a second stage liquid reactor. Only 18% of the organics were truly soluble (<1kD). The rest were in colloidal and very fine particulate form which originated from grass and cow manure and were non-biodegradable.
authors: INRA, UR50, Laboratoire de Biotechnologie de l'Environnement, Avenue des Etangs, Narbonne F-11100, France. Electronic address: sairganesh@yahoo.com.
authors: Rangaraj
authors: R
authors: Ganesh
authors: Michel
authors: M
authors: Torrijos
authors: Philippe
authors: P
authors: Sousbie
authors: Jean Philippe
authors: JP
authors: Steyer
authors: Aurelien
authors: A
authors: Lugardon
authors: Jean Philippe
authors: JP
authors: Delgenes
mesh_terms: D056804:Biofuels; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D005232:Fatty Acids, Volatile / Q000032:analysis; D005374:Filtration; D005735:Garbage; D006863:Hydrogen-Ion Concentration; D008372:Manure; D008697:Methane / Q000032:analysis / Q000378:metabolism*; D010316:Particle Size; D006109:Poaceae
chemical_list: D056804:Biofuels; D005232:Fatty Acids, Volatile; D008372:Manure; D008697:Methane