Monofermentation of grass silage under mesophilic conditions: measurements and mathematical modeling with ADM 1.
In this paper experimental data from grass fermentation and simulation results with the Anaerobic Digestion Model (ADM) No. 1 are described. Two laboratory reactors were operated under mesophilic conditions with volumetric loading rates in between 0.3 and 2.5 kg(VS)/(m(3) x d). Two different kinds of grass silage were used as substrates, resulting in an average specific biogas production of 600 L/kg(VS). The ADM 1 was calibrated both manually and with the help of a Genetic Algorithm in Matlab/Simulink. Results from calibration indicate that the NH3 inhibition constant used to model the inhibition of acetate uptake is three to five times higher compared with digested activated sludge. The hydrogen inhibition constants applied for propionate and valerate/butyrate uptake are around two orders of magnitude lower than for sludge digestion.
Wichern
Marc
M
Institute of Water Quality Control, Technische Universität München, Am Coulombwall, 85748 Garching, Bavaria, Germany. wga@bv.tum.de
Gehring
Tito
T
Fischer
Katrin
K
Andrade
Diana
D
Lübken
Manfred
M
Koch
Konrad
K
Gronauer
Andreas
A
Horn
Harald
H
D000465:Algorithms; D019149:Bioreactors; D002138:Calibration; D003198:Computer Simulation; D005285:Fermentation; D008954:Models, Biological; D010100:Oxygen; D006109:Poaceae / Q000502:physiology*; D012820:Silage; D013696:Temperature; D014835:Volatilization
D010100:Oxygen