title: Modified ADM1 disintegration/hydrolysis structures for modeling batch thermophilic anaerobic digestion of thermally pretreated waste activated sludge.
abstract: Anaerobic digestion disintegration and hydrolysis have been traditionally modeled according to first-order kinetics assuming that their rates do not depend on disintegration/hydrolytic biomass concentrations. However, the typical sigmoid-shape increase in time of the disintegration/hydrolysis rates cannot be described with first-order models. For complex substrates, first-order kinetics should thus be modified to account for slowly degradable material. In this study, a slightly modified IWA ADM1 model is presented to simulate thermophilic anaerobic digestion of thermally pretreated waste activated sludge. Contois model is first included for disintegration and hydrolysis steps instead of first-order kinetics and Hill function is then used to model ammonia inhibition of aceticlastic methanogens instead of a non-competitive function. One batch experimental data set of anaerobic degradation of a raw waste activated sludge is used to calibrate the proposed model and three additional data sets from similar sludge thermally pretreated at three different temperatures are used to validate the parameters values.
authors.affiliation: INRA, UR50, Laboratoire de Biotechnologie de l'Environnement, Avenue des Etangs, Narbonne F-11100, France.
authors.forename: Ivan
authors.initials: I
authors.lastname: Ramirez
authors.forename: Alexis
authors.initials: A
authors.lastname: Mottet
authors.forename: Hélène
authors.initials: H
authors.lastname: Carrère
authors.forename: Stéphane
authors.initials: S
authors.lastname: Déléris
authors.forename: Fabien
authors.initials: F
authors.lastname: Vedrenne
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Steyer
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D003198:Computer Simulation; D005232:Fatty Acids, Volatile / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D008697:Methane / Q000032:analysis; D008956:Models, Chemical; D010100:Oxygen / Q000302:isolation & purification; D052638:Particulate Matter / Q000032:analysis; D012722:Sewage / Q000382:microbiology*; D012995:Solubility; D013696:Temperature; D014865:Waste Disposal, Fluid
chemical_list: D005232:Fatty Acids, Volatile; D052638:Particulate Matter; D012722:Sewage; D008697:Methane; D010100:Oxygen