Phytoremediation of No. 2 fuel oil-contaminated soil.

Phytoremediation has been implemented at an industrial site in Wisconsin to promote in situ remediation of No. 2 fuel oil-contaminated soil. The goal of the project is to utilize microbial-enhancing processes within the rhizosphere of trees to stimulate biodegradation of diesel range organics (DROs) within four contaminated hot spots at the site. Between 40 and 90% reductions in the concentrations of the DROs were observed over the course of a 24-week bench-scale bioventing study performed in 1994. In addition to a reduction in the concentration of DROs, the chromatograms for those analyses exhibited a relative decrease in the proportion of the more water soluble and available shorter chained or lower molecular weight DROs compared to their higher molecular weight counterparts in the fuel. In addition to a decrease in concentration, this observed change in the pattern of the chromatograms over time is consistent with biodegradation of DROs. An agronomic assessment performed in 1995 indicated that conditio...