Biological removal of the xenobiotic trichloroethylene (TCE) through cometabolism in nitrifying systems


KOCAMEMİ B. , ÇEÇEN F.

BIORESOURCE TECHNOLOGY, vol.101, no.1, pp.430-433, 2010 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 101 Issue: 1
  • Publication Date: 2010
  • Doi Number: 10.1016/j.biortech.2009.07.079
  • Title of Journal : BIORESOURCE TECHNOLOGY
  • Page Numbers: pp.430-433

Abstract

In the present study, cometabolic TCE degradation was evaluated using NH(4)-N as the growth-substrate. At initial TCE concentrations up to 845 mu g/L, WE degradation followed first-order kinetics. The increase in ammonium utilization rate favored the degradation of TCE. This ensured that biological transformation of TCE in nitrifying systems is accomplished through a cometabolic pathway by the catalysis of non-specific ammonia oxygenase enzyme of nitrifiers. The transformation yield (T(y)) of TCE, the amount of TCE degraded per unit mass of NH(4)-N, strongly depended on the initial NH(4)-N and TCE concentrations. In order to allow a rough estimation of TCE removal and nitrification at different influent TCE and NH(4)-N concentrations, a linear relationship was developed between 1/T(y) and the initial NH(4)-N/TCE ratio. The estimated T(y) values lead to the conclusion that nitrifying systems are promising candidates for biological removal of TCE through cometabolism. (C) 2009 Elsevier Ltd. All rights reserved.