Evaluation in a continuous-flow column of different fermenting substrates for the reductive dehalogenation of trichloroethene

M. Azizian, I. Marshall, S. Behrens, A. Spormann, L. Semprini

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A continuous-flow column study was conducted to analyse the reductive dehalogenation of trichloroethene (TCE) in aquifer material with a composition high in iron oxides. The column was bioaugmented with the Point Mugu (PM) culture, which is a mixed microbial enrichment culture capable of completely transforming TCE to ethene (ETH). Most of the metabolic reducing equivalents were channelled to sulfate, Fe(III), and Mn(IV) reduction. When equal electron-reducing equivalents were added, the most effective dehalogenation was achieved using formate as an electron donor, with 14% of the electron equivalents going towards dehalogenation reactions, compared to 6.7% for lactate and 9.6% for propionate. Lactate and propionate addition resulted in a significant increase in Geobacter, Spirochaetes, and Desulfovibrio phylotypes relative to Dehalococcides when compared to formate addition. Molecular results support chemical observations that a greater percentage of the electron donor addition was channeled to Fe(III) reduction when lactate and propionate were added compared to formate.

Original languageEnglish (US)
Title of host publicationGQ10
Subtitle of host publicationGroundwater Quality Management in a Rapidly Changing World
Pages209-212
Number of pages4
StatePublished - Dec 1 2011
Event7th International Groundwater Quality Conference: Groundwater Quality Management in a Rapidly Changing World, GQ10 - Zurich, Switzerland
Duration: Jun 13 2010Jun 18 2010

Publication series

NameIAHS-AISH Publication
Volume342
ISSN (Print)0144-7815

Other

Other7th International Groundwater Quality Conference: Groundwater Quality Management in a Rapidly Changing World, GQ10
CountrySwitzerland
CityZurich
Period6/13/106/18/10

Keywords

  • Chlorinated solvents
  • Column study
  • Electron donors
  • Reductive dehalogenation

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