Inhibitory effect of the xenobiotic 1,2-dichloroethane in a nitrifying biofilm reactor

Alpaslan Kocamemi B., Cecen F.

WATER SCIENCE AND TECHNOLOGY, vol.55, no.8-9, pp.67-73, 2007 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 55 Issue: 8-9
  • Publication Date: 2007
  • Doi Number: 10.2166/wst.2007.243
  • Journal Name: WATER SCIENCE AND TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED)
  • Page Numbers: pp.67-73
  • Keywords: biofilm systems, cometabolism, 1,2-dichloroethane, inhibition, nitrification, xenobiotics, COMETABOLIC DEGRADATION, NITROSOMONAS-EUROPAEA, TRICHLOROETHYLENE, NITRIFICATION, INACTIVATION, KINETICS, MONOOXYGENASE, RECOVERY, TCE
  • Marmara University Affiliated: Yes

Abstract

The aim was to investigate the inhibitory effect of the xenobiotic 1,2-DCA on nitrification during the cometabolic degradation in a packed bed nitrifying biofilm reactor. This xenobiotic inhibited primarily the conversion of NH4-N to hydroxylamine by binding to the AMO enzyme. It had no inhibitory effect on the conversion of nitrite to nitrate. At high NH4-N loadings, the presence of 1,2-DCA inhibited NH4-N utilisation more severely than at low loadings. The suppressing effect of 1,2-DCA on NH4-N utilisation was found to be Go reversible due to the ability of cells to recover from inhibition. These results could fill a gap in the literature about the potential use of nitrifying biofilm systems for cometabolic treatment of 1,2-DCA and could be useful in the design of engineered 1,2-DCA remediation/treatment in biofilm reactors.