title: Parameter identification of thermophilic anaerobic degradation of valerate.
abstract: The considered mathematical model of the decomposition of valerate presents three unknown kinetic parameters, two unknown stoichiometric coefficients, and three unknown initial concentrations for biomass. Applying a structural identifiability study, we concluded that it is necessary to perform simultaneous batch experiments with different initial conditions for estimating these parameters. Four simultaneous batch experiments were conducted at 55 degrees C, characterized by four different initial acetate concentrations. Product inhibition of valerate degradation by acetate was considered. Practical identification was done optimizing the sum of the multiple determination coefficients for all measured state variables and for all experiments simultaneously. The estimated values of kinetic parameters and stoichiometric coefficients were characterized by the parameter correlation matrix, the confidence interval, and the student's t-test at 5% significance level with positive results except for the saturation constant, for which more experiments for improving its identifiability should be conducted. In this article, we discuss kinetic parameter estimation methods.
authors.affiliation: Department of Environment and Soil Science, University of Lleida, Rovira Roure 177, 25198, Spain. flotats@macs.udl.es
authors.forename: Xavier
authors.initials: X
authors.lastname: Flotats
authors.forename: Birgitte K
authors.initials: BK
authors.lastname: Ahring
authors.forename: Irini
authors.initials: I
authors.lastname: Angelidaki
mesh_terms: D000465:Algorithms; D001421:Bacteria, Anaerobic / Q000166:cytology / Q000254:growth & development* / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000145:classification / Q000382:microbiology*; D018929:Cell Culture Techniques / Q000379:methods; D002455:Cell Division; D020650:Combinatorial Chemistry Techniques; D003198:Computer Simulation; D019605:Euryarchaeota / Q000166:cytology / Q000254:growth & development / Q000378:metabolism; D006868:Hydrolysis; D007220:Industrial Waste / Q000517:prevention & control; D007700:Kinetics; D008697:Methane / Q000378:metabolism*; D008954:Models, Biological; D011786:Quality Control; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012722:Sewage / Q000382:microbiology; D014631:Valerates / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D018508:Water Purification / Q000379:methods*
chemical_list: D007220:Industrial Waste; D012722:Sewage; D014631:Valerates; D014874:Water Pollutants, Chemical; D008697:Methane