Ozone treatment of PAH contaminated soils: Operating variables effect

Comparison between continuous and intermittent ozonation for remediation of soils contaminated with polycyclic aromatic hydrocarbons

“…In the present study, the soils were characterized as low water, low SOM (Table 1), which would benefit PAH degradation by ozonation. Similar results were seen in previous studies (Eberius et al 1997;Masten and Davies 1997;Goi and Trapido 2004;Hong et al 2008;Luster-Teasley et al 2009;Rivas et al 2009). In soils, ozone can be readily decomposed upon reacting SOM and metal oxide to produce OH radical (Choi et al 2002;Jung and Choi 2003), which is a powerful, effective, nonspecific oxidizing agent.…”

“…The ozone decomposition rate in soil water is first order regarding gaseous ozone concentration, and the reaction rate between ozone and soil matrix is second order, while the removal of PAH experiences pseudo-first-order kinetics (Hsu and Masten 1997). Ozone concentration exerts a slight positive effect, but difficult to increase PAH removal efficiency when high ozone concentrations are used (Rivas et al 2009). In addition, soil characteristics would affect the remediation efficiency of ozonation.…”

“…Ozone reacted with PAHs by bond attack to produce the quinone or hydroxyl functional groups and by atom attack to cause ring cleavage resulting in phenyl-naphthyl-type products (Yao et al 1998a, b). Ozonation has been established as a promising approach for the remediation of PAH-contaminated soils under unsaturated or saturated conditions (Eberius et al 1997;Masten and Davies 1997;Goi and Trapido 2004;Goi et al 2006;Hong et al 2008;Luster-Teasley et al 2009;Rivas et al 2009). Furthermore, several field sites contaminated with petroleum were successfully remediated using in situ ozone sparging system (Nimmer et al 2000).…”

Effects of ozonation on soil organic matter of contaminated soil containing residual oil

“…Many studies have focused on the removal of contaminants (Luster-Teasley et al 2009;O'Mahony et al 2006;Rivas et al 2009) but only a few have addressed the side effects of ozonation, such as the change in SOM and its consequences. The influence of chemical oxidation on SOM is an important issue associated with the technology because SOM has been shown to play an important role in the sequestration of HOCs in soil.…”

Selection of oxidant doses for in situ chemical oxidation of soils contaminated by polycyclic aromatic hydrocarbons (PAHs): A review

“…Similarly, soil organic matter content is often measured but also seldom considered in oxidant dose selection. Moreover, even if TOC is the most common indicator (Figure 3), it may have been quantified by a number of methods [244]: dry combustion at 440 °C [94], 680 °C [47] or 900 °C [41,49,50,56,57,163,203,240,241], wet oxidation with dichromate [205,[234][235][236][237] or a mix of both methods [54]. The measurement method may be not specified [30,150,194,206,213,216,221,222,232,233].…”