title: Biogas from grass silage - Measurements and modeling with ADM1.
abstract: Mono fermentation of grass silage without the addition of manure was performed over a period of 345days under mesophilic conditions (38 degrees C). A simulation study based on the IWA Anaerobic Digestion Model No. 1 (ADM1) was done in order to show its applicability to lignocellulosic biomass. Therefore, the influent was fractioned by established fodder analysis (Weender analysis and van Soest method). ADM1 was modified with a separate compound of inert decay products similar to the approach of Activated Sludge Model No. 1 (ASM1). Furthermore, a function, which described the influence of solids on the process of hydrolysis, has been integrated to reproduce reliable ammonium concentrations. The model was calibrated by using the modified Nash-Sutcliffe coefficient to evaluate simulation quality. It was possible to fit observed data by changing only hydrogen inhibition constants and the maximum acetate uptake rate. The extended ADM1 model showed good agreement with measurements and was suitable for modeling anaerobic digestion of grass silage.
authors.affiliation: Institute of Water Quality Control, Technische Universität München, Am Coulombwall, 85748 Garching, Germany.
authors.forename: Konrad
authors.initials: K
authors.lastname: Koch
authors.forename: Manfred
authors.initials: M
authors.lastname: Lübken
authors.forename: Tito
authors.initials: T
authors.lastname: Gehring
authors.forename: Marc
authors.initials: M
authors.lastname: Wichern
authors.forename: Harald
authors.initials: H
authors.lastname: Horn
mesh_terms: D000085:Acetates / Q000032:analysis; D056804:Biofuels / Q000032:analysis*; D019149:Bioreactors; D001709:Biotechnology / Q000379:methods*; D002087:Butyrates / Q000032:analysis; D002138:Calibration; D003198:Computer Simulation; D006868:Hydrolysis; D007700:Kinetics; D008954:Models, Biological; D009584:Nitrogen / Q000032:analysis; D010100:Oxygen / Q000378:metabolism; D006109:Poaceae / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000032:analysis; D012820:Silage / Q000032:analysis*; D014865:Waste Disposal, Fluid
chemical_list: D000085:Acetates; D056804:Biofuels; D002087:Butyrates; D000644:Quaternary Ammonium Compounds; D009584:Nitrogen; D010100:Oxygen