title: Do two-phase biogas plants separate anaerobic digestion phases? - a mathematical model for the distribution of anaerobic digestion phases among reactor stages.
abstract: In this article a mathematical model is introduced, which estimates the distribution of the four anaerobic digestion phases (hydrolysis, acidogenesis, acetogenesis and methanogenesis) that occur among the leach bed reactor and the anaerobic filter of a biogas plant. It is shown that only the hydrolysis takes place in the first stage (leach bed reactor), while all other anaerobic digestion phases take place in both reactor stages. It turns out that, besides the usually measured raw materials of the acetogenesis and the methanogenesis phases (organic acids), it is also necessary to analyze the process liquid for raw materials of the acidogenesis phase, i.e., sugars, fatty acids, amino acids, etc. The introduced model can be used to monitor the inhibition of the anaerobic digestion phases in reactor stages and can, thus, help to improve the control system of biogas plants.
authors.affiliation: Goethe-University, Goethe-Center for Scientific Computing, Kettenhofweg 139, 60325 Frankfurt a.M., Germany. ivo.muha@gcsc.uni-frankfurt.de
authors.forename: Ivo
authors.initials: I
authors.lastname: Muha
authors.forename: Simon
authors.initials: S
authors.lastname: Zielonka
authors.forename: Andreas
authors.initials: A
authors.lastname: Lemmer
authors.forename: Mandy
authors.initials: M
authors.lastname: Schönberg
authors.forename: Bernd
authors.initials: B
authors.lastname: Linke
authors.forename: Alfio
authors.initials: A
authors.lastname: Grillo
authors.forename: Gabriel
authors.initials: G
authors.lastname: Wittum
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels; D018533:Biomass; D019149:Bioreactors; D006868:Hydrolysis; D008697:Methane / Q000096:biosynthesis*; D008962:Models, Theoretical; D006109:Poaceae / Q000378:metabolism*
chemical_list: D056804:Biofuels; D008697:Methane