Biodegradation

, Volume 21, Issue 6, pp 947–956 | Cite as

Development of a treatment solution for reductive dechlorination of hexachloro-1,3-butadiene in vadose zone soil

  • Lachlan H. Yee
  • Vibeke Aagaard
  • Angela Johnstone
  • Matthew Lee
  • Staffan J. Kjelleberg
  • Mike Manefield
Original Paper

Abstract

The biodegradation of chlorinated organics in vadose zone soils is challenging owing to the presence of oxygen, which inhibits reductive dehalogenation reactions and consequently the growth of dehalorespiring microbes. In addition, the hydraulic conductivity of vadose zone soils is typically high, hence attempts to remediate such zones with biostimulation solutions are often unsuccessful due to the short residence times for these solutions to act upon the native bacterial community. In this study we have identified sodium alginate as a hydrogel polymer that can be used to increase the residence time of a nutrient solution in an unsaturated sandy soil. Additionally we have identified neutral red as a redox active compound that can catalyse the reductive dechlorination of the chlorinated organic hexachloro-1,3-butadiene by activated sludge fed with lactate and acetate. Finally we have shown that a nutrient solution amended with neutral red and sodium alginate can lower the redox potential and reduce hexachloro-1,3-butadiene concentrations in a contaminated vadose zone soil.

Keywords

Soil bioremediation In situ dechlorination Alginate polymer Hexachloro-1,3-butadiene Biostimulation Neutral red 

Notes

Acknowledgements

This work was supported by the Environmental Biotechnology Cooperative Research Centre and Orica Australia Pty Ltd. Mike Manefield, Lachlan Yee and Matthew Lee were supported by postdoctoral fellowships. Vibeke Aagaard and Angela Johnstone were supported by student stipends.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Lachlan H. Yee
    • 1
  • Vibeke Aagaard
    • 1
  • Angela Johnstone
    • 1
  • Matthew Lee
    • 1
  • Staffan J. Kjelleberg
    • 1
  • Mike Manefield
    • 1
  1. 1.Centre for Marine Bio-InnovationThe University of New South WalesSydneyAustralia

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