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Phytoextraction of metals from soils: how far from practice?
Lotte Van Nevel1, Jan Mertens, Koen Oorts
1Laboratory of Forestry, Department of Forest and Water Management, Ghent University, Geraardsbergsesteenweg 267, B-9090 Melle, Belgium. lotte.vannevel@ugent.be
Environmental Pollution (Barking, Essex : 1987)
|July 3, 2007
Summary
Phytoextraction of trace elements like cadmium (Cd) requires doubling plant uptake to significantly reduce soil contamination. Alternative methods such as phytostabilization may be more practical for environmental remediation.
Area of Science:
- Environmental Science
- Biotechnology
- Soil Science
Background:
- Phytoextraction is a promising technique for removing trace elements from contaminated soils.
- Current phytoextraction methods face limitations in efficiency and practicality for widespread application.
Purpose of the Study:
- To evaluate the feasibility of phytoextraction for reducing soil cadmium (Cd) concentrations.
- To assess the required improvements for phytoextraction to become a practical remediation strategy.
Main Methods:
- Modeling calculations were performed to determine the necessary increase in Cd uptake by hyperaccumulating plants (Thlaspi caerulescens, Salix spp.).
- The study analyzed the time frame and extent of Cd reduction in the topsoil (0.5m).
Main Results:
- Phytoextraction would require doubling the current Cd uptake by Thlaspi caerulescens or Salix spp. to achieve a slight reduction in soil Cd concentration over 10 years.
- The accumulation of metals by plants presents potential environmental risks.
Conclusions:
- Phytoextraction, in its current state, is not practically feasible for significant soil Cd reduction within a reasonable timeframe.
- Alternative remediation strategies like bioavailable contaminant stripping and phytostabilization may offer more appropriate solutions for managing metal-contaminated sites.
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