Enhanced reductive dechlorination of DDT in an anaerobic system of dissimilatory iron-reducing bacteria and iron oxide

Environ Pollut. 2010 May;158(5):1733-40. doi: 10.1016/j.envpol.2009.11.020. Epub 2009 Dec 23.

Abstract

The transformation of DDT was studied in an anaerobic system of dissimilatory iron-reducing bacteria (Shewanella decolorationis S12) and iron oxide (alpha-FeOOH). The results showed that S. decolorationis could reduce DDT into DDD, and DDT transformation rate was accelerated by the presence of alpha-FeOOH. DDD was observed as the primary transformation product, which was demonstrated to be transformed in the abiotic system of Fe(2+)+alpha-FeOOH and the system of DIRB+alpha-FeOOH. The intermediates of DDMS and DBP were detected after 9 months, likely suggesting that reductive dechlorination was the main dechlorination pathway of DDT in the iron-reducing system. The enhanced reductive dechlorination of DDT was mainly due to biogenic Fe(II) sorbed on the surface of alpha-FeOOH, which can serve as a mediator for the transformation of DDT. This study demonstrated the important role of DIRB and iron oxide on DDT and DDD transformation under anaerobic iron-reducing environments.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Anaerobiosis
  • Biotransformation
  • DDT / metabolism*
  • Dichlorodiphenyldichloroethane / metabolism*
  • Ferric Compounds / metabolism*
  • Iron / metabolism*
  • Oxidation-Reduction
  • Shewanella / metabolism*

Substances

  • Ferric Compounds
  • ferric oxide
  • DDT
  • Iron
  • Dichlorodiphenyldichloroethane