52

GREENHOUSE-SCALE EVALUATION OF PHYTOREMEDIATION FOR SOILS CONTAMINATED WITH WOOD PRESERVATIVES

Using conventional techniques for soil extraction and analysis, concentrations of PCP and 16 PAHs were determined at two-month intervals for eight months. Detailed results are presented for two analytes: PCP and pyrene. At the two-month sampling time, the concentrations of both analytes were significantly lower in the planted soil compared to the unplanted-amended soils. At 8 months, however, analyte concentrations were the same for the two treatments. Results obtained for other PAHs containing four aromatic rings were similar to those obtained for pyrene.

However, for PAHs containing two, and those with five aromatic rings, the planted soil treatments showed only marginal increases in biodegradation compared to the unplanted-amended soils. These results suggested that rates of biodegradation for PCP and PAHs with four aromatic rings could be accelerated by the presence of plant roots. Final extents of removal are still being evaluated.

Key words: phytoremediation, PCP, PAH, biodegradation, ryegrass