The inhibitory effects of 2-CP and 2,4-DCP containing effluents on sequencing batch reactors

Nalbur B. E. , Alkan U.

INTERNATIONAL BIODETERIORATION & BIODEGRADATION, vol.60, no.3, pp.178-188, 2007 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 60 Issue: 3
  • Publication Date: 2007
  • Doi Number: 10.1016/j.ibiod.2007.03.001
  • Page Numbers: pp.178-188


The impacts of 2- chlorophenol (2-CP) and 2,4-dichlorophenol (2,4-DCP) on the kinetics of biogenic substrate utilization by biomass from sequencing batch reactors (SBRs) were investigated. Experiments were carried out with a mixed unacclimated biomass from two SBRs with sludae ages of 5 and 8 days, using a respirometric method. The EC50 values of 2-CP and 2,4-DCP for the biomass from SBRs with sludge ages of 5 days and 8 days were found to be 141 and 163 mgl(-1), and 40 and 91 mgl(-1), respectively. Test compounds induced a stable inhibition effect with time on target microorganisms. 2-CP exhibited uncompetitive inhibition whereas 2.4-DCP exhibited noncompetitive inhibition according to the maximum oxygen uptake rate (OURmax) and K-s trends. 2-CP and 2,4-DCP both exerted higher inhibition effect on biomass with 5 days of sludge age. (c) 2007 Elsevier Ltd. All rights reserved.