Modelling biodegradation of nonylphenol ethoxylate in acclimated and non-acclimated microbial cultures


Karahan O. , OLMEZ-HANCI T., ARSLAN-ALATON I., ORHON D.

BIORESOURCE TECHNOLOGY, vol.101, no.21, pp.8058-8066, 2010 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 101 Issue: 21
  • Publication Date: 2010
  • Doi Number: 10.1016/j.biortech.2010.05.081
  • Title of Journal : BIORESOURCE TECHNOLOGY
  • Page Numbers: pp.8058-8066

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 150 mg/L on the basis of COD and negatively influenced biomass growth through a competitive inhibition mechanism with a coefficient of 500 mg/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 5000 mg/L, practically showing no inhibition, and the coefficient of competitive inhibition increased to 450 mg/L., corresponding to a significant decrease in the inhibitory effects of NPEO on growth. (c) 2010 Elsevier Ltd. All rights reserved.