Microbial degradation of chlorinated benzenes

Research output: Contribution to journalReview article

85 Scopus citations

Abstract

Chlorinated benzenes are important industrial intermediates and solvents. Their widespread use has resulted in broad distribution of these compounds in the environment. Chlorobenzenes (CBs) are subject to both aerobic and anaerobic metabolism. Under aerobic conditions, CBs with four or less chlorine groups are susceptible to oxidation by aerobic bacteria, including bacteria (Burkholderia, Pseudomonas, etc.) that grow on such compounds as the sole source of carbon and energy. Sound evidence for the mineralization of CBs has been provided based on stoichiometric release of chloride or mineralization of 14C-labeled CBs to 14CO2. The degradative attack of CBs by these strains is initiated with dioxygenases eventually yielding chlorocatechols as intermediates in a pathway leading to CO2 and chloride. Higher CBs are readily reductively dehalogenated to lower chlorinated benzenes in anaerobic environments. Halorespiring bacteria from the genus Dehalococcoides are implicated in this conversion. Lower chlorinated benzenes are less readily converted, and mono-chlorinated benzene is recalcitrant to biotransformation under anaerobic conditions.

Original languageEnglish (US)
Pages (from-to)463-480
Number of pages18
JournalBiodegradation
Volume19
Issue number4
DOIs
StatePublished - Jul 1 2008

Keywords

  • Biotransformation
  • Chlorobenzenes
  • Dechlorination
  • Dehalogenation
  • Microbial degradation
  • Organohalogens

ASJC Scopus subject areas

  • Environmental Engineering
  • Microbiology
  • Bioengineering
  • Environmental Chemistry
  • Pollution

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