| Improving Removal of Metals from Soil by Salix |
June 2003 |
| Author(s): Greger, Maria & T. Landberg (Stockholm Univ., Stockholm, Sweden) |
Proceedings of the 7th International Conference on the Biogeochemistry of Trace Elements (7th ICOBTE), 15-19 June 2003, Uppsala, Sweden. Book of Abstracts. Vol I-II, p 146-147, 2003
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| Mine: |
Waste Type: soil |
Contaminant(s): metals |
Technology Type: phytoextraction |
| Keywords: contaminant extraction, phytoremediation, phytoextraction |
| Abstract: Phytoextraction is a phytoremediation method using plants to clean metal-polluted soils. Specific Salix clones with high metal-accumulation capacity in shoot and high biomass production may be very suitable for phytoextraction at sites where the contaminant levels are not too high, such as agricultural soil with elevated levels of cadmium. A major advantage with Salix in phytoextraction is that well-established techniques for cultivation and contaminant extraction already exist at a commercial scale: the plant material is combusted and the metals are separated from the ash. About 18,000 Ha of Salix is in production in Sweden. A good phytoextractor should have a high biomass production since it is the removal of the metal per hectare that counts; however, Salix clones with high metal accumulation do not always have high biomass production: i.e., no relation exists between the properties of high biomass production and high uptake of a metal. An increase of the biomass with increasing plant density per square meter of a particular clone was examined for its effect on decreasing the metal removal time in a study of how biomass can improve the phytoextraction capacity of Salix. |
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