title: Modelling biodegradation of nonylphenol ethoxylate in acclimated and non-acclimated microbial cultures.
abstract: The biodegradation and inhibition kinetics of a commercial nonylphenol ethoxylate formulation were modelled for an activated sludge system fed with a synthetic substrate and nonylphenol ethoxylate mixture. Kinetic and stoichiometric coefficients of the proposed activated sludge model were obtained by employing on-line respirometry. Experimental as well as model results confirmed that nonylphenol ethoxylate exhibited non-competitive inhibition on the hydrolysis process with a coefficient of 150mg/L on the basis of COD and negatively influenced biomass growth through a competitive inhibition mechanism with a coefficient of 500mg/L on the basis of COD, when the biomass was not acclimated. Upon acclimation of the activated sludge system, the inhibition concentration for non-competitive inhibition on hydrolysis was increased to 5000mg/L, practically showing no inhibition, and the coefficient of competitive inhibition increased to 450mg/L, corresponding to a significant decrease in the inhibitory effects of NPEO on growth.
authors.affiliation: Istanbul Technical University, Faculty of Civil Engineering, Department of Environmental Engineering, 34469 Maslak, Istanbul, Turkey.
authors.forename: Ozlem
authors.initials: O
authors.lastname: Karahan
authors.forename: Tugba
authors.initials: T
authors.lastname: Olmez-Hanci
authors.forename: Idil
authors.initials: I
authors.lastname: Arslan-Alaton
authors.forename: Derin
authors.initials: D
authors.lastname: Orhon
mesh_terms: D000064:Acclimatization; D001419:Bacteria / Q000166:cytology* / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002138:Calibration; D003198:Computer Simulation; D005026:Ethylene Glycols / Q000378:metabolism*; D007700:Kinetics; D008954:Models, Biological; D010100:Oxygen / Q000378:metabolism; D013997:Time Factors
chemical_list: D005026:Ethylene Glycols; C021754:terics; D010100:Oxygen