Related Experiment Video
Updated: Jun 12, 2026

Aerobic Biodegradation Testing of Materials Using a Natural Marine Seawater Inoculum and Closed Loop Respirometer
Published on: October 24, 2025
Modelling biodegradation of nonylphenol ethoxylate in acclimated and non-acclimated microbial cultures
Ozlem Karahan1, Tugba Olmez-Hanci, Idil Arslan-Alaton
1Istanbul Technical University, Faculty of Civil Engineering, Department of Environmental Engineering, 34469 Maslak, Istanbul, Turkey.
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.
More Related Videos
13:16A Whole Cell Bioreporter Approach to Assess Transport and Bioavailability of Organic Contaminants in Water Unsaturated Systems
Published on: December 24, 2014
10:03Isolation, Propagation, and Identification of Bacterial Species with Hydrocarbon Metabolizing Properties from Aquatic Habitats
Published on: December 7, 2021
Related Concept Videos
Microbial Bioremediation of Hydrocarbons
Bioplastics
Microbial Bioremediation of Plastics
Microbial Bioremediation of Pesticides
Microbial Wastewater Treatment