title: Impact of initial biodegradability on sludge anaerobic digestion enhancement by thermal pretreatment.
abstract: Thermal treatments with temperature ranging from 60 to 210 degrees C were applied to 6 waste-activated sludge samples originating from high or medium load, extended aeration wastewater treatment processes that treated different wastewaters (urban, urban and industrial or slaughterhouse). COD sludge solubilisation was linearly correlated with the treatment temperature on the whole temperature range and independently of the sludge samples. Sludge batch mesophilic biodegradability increased with treatment temperature up to 190 degrees C. In this temperature range, biodegradability enhancement or methane production increase by thermal hydrolysis was shown to be a function of sludge COD solubilisation but also of sludge initial biodegradability. The lower the initial biodegradability means the higher efficiency of thermal treatment.
authors.affiliation: Laboratoire de Biotechnologie de l'Environnement, Narbonne, France. carrere@supagro.inra.fr
authors.forename: Hélène
authors.initials: H
authors.lastname: Carrère
authors.forename: Claire
authors.initials: C
authors.lastname: Bougrier
authors.forename: Delphine
authors.initials: D
authors.lastname: Castets
authors.forename: Jean Philippe
authors.initials: JP
authors.lastname: Delgenès
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D019149:Bioreactors; D006358:Hot Temperature; D006868:Hydrolysis; D010100:Oxygen / Q000737:chemistry / Q000378:metabolism; D012722:Sewage / Q000737:chemistry*; D012995:Solubility; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D012722:Sewage; D010100:Oxygen