Phytoremediation of heavy metal and PAH-contaminated brownfield sites

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Phytoremediation of heavy metal and
PAH-contaminated brownfield sites

• Sébastien Roy, et al. 2004
• Plant and Soil
• 272 277-290

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Background Information

• Use of plants to clean up pollutants in
  environment
• Set of technologies that use different plants for
  techniques
• Containment, destruction, extraction,
  transpiration

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Phytoremediation Diagram
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Pros and Cons of Phytoremediation
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Goals of this paper

• Assess heavy metal phytoextraction performance
  from alkaline soils
• Assess the impact of phytoextraction plants on
  rhizosphere communities

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Materials and Methods

• Soil excavation
• Alkaline soils contaminated with metals and PAHs
• Indian mustard, willow, and fescue
• Chosen because they can extract heavy-metals and
  grow on the tested soils
• Pot Trials
• Chelating agent EDTA

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Materials and Methods

• Heavy metal analysis
• Roots and aerial
• Microbial enumerations
• Plate count
• Community DNA extraction and DGGE
• 13 samples, characterized diversity

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Results
Indian mustard
Willow
Fescue
Figure 1
Figure 2
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Results
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Results
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Results
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Results
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Discussion

• Heavy metal accumulations
• Preferred Harvests
• Plant mixtures
• Rhizosphere populations
• PAH degradation
• Usefulness of study for projections

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Conclusion

• Phytoremediation
• can offer a feasible alternative for restoration
• can take a long time with many harvests
• is an important tool for controlling contaminant
  migration

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Questions???
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Sources

• Becker, Hank. Phytoremediation Using Plants to
  Clean Up
• Soils. Agricultural Research Magazine. June
  2000 Vol. 48, No. 6. http//www.ars.usda.gov/is/
  AR/archive/jun00/soil0600.htm
• National Risk Management Research Laboratory,
  USEPA. Introduction to Phytoremediation.
• http//clu-in.org/download/remed/introphyto.pdf
• Roy, Sebastien, et al. Phytoremediation of heavy
  metal and PAH-contaminated brownfield sites.
  Plant and Soil (2005) 272 277-290.