Remediation of PAH-Contaminated Soils and Sediments: A ...
Remediation of PAH-Contaminated Soils and Sediments: A ...
Remediation of PAH-Contaminated Soils and Sediments: A ...
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Jonsson et al. (2006) used both Fenton’s reagent <strong>and</strong> ozonation on nine samples<br />
from five different contaminated sites <strong>and</strong> found that Fenton’s reagent was<br />
generally more efficient in degrading <strong>PAH</strong>s than ozone treatment. Fenton’s<br />
reagent removed 40-86% <strong>of</strong> the initial <strong>PAH</strong>s, as opposed to 10-70% removal by<br />
ozone oxidation. Ozonation was more effective in degrading LMW <strong>PAH</strong>s than<br />
HMW <strong>PAH</strong>s, while Fenton’s reagent removed <strong>PAH</strong>s <strong>of</strong> all weights. However,<br />
most researchers have found that the oxidation rate <strong>of</strong> LMW <strong>PAH</strong> compounds by<br />
Fenton’s reagents is generally higher than that <strong>of</strong> HMW <strong>PAH</strong>s (Wilson <strong>and</strong><br />
Jones, 1993). Some exceptions to this are anthracene <strong>and</strong> benzo[a]pyrene,<br />
possibly due to their high reactivity towards hydroxyl radicals (Lundstedt et al.,<br />
2006). Both Nam et al. (2001) <strong>and</strong> Flotron et al. (2005) found that<br />
benzo[a]pyrene was more easily oxidized by Fenton’s reagent than many smaller<br />
<strong>PAH</strong> compounds, probably due to its lower oxidation potential.<br />
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