Depth of Fenton-like oxidation in remediation of surface soil
- Washington State Univ., Pullman, WA (United States). Dept. of Civil and Environmental Engineering
A series of soil columns was used to investigate the depth of Fenton-like reactions provided by the surface application of catalyzed hydrogen peroxide. Initial experiments examined the effect of four stabilizers (monobasic potassium phosphate, dibasic potassium phosphate, sodium tripolyphosphate, and silicic acid) on H{sub 2}O{sub 2} decomposition and the depth to which H{sub 2}O{sub 2} could be detected. The H{sub 2}O{sub 2} dynamics along the depth of the column showed that the addition of the most effective stabilizers, monobasic potassium phosphate, increased the depth of the detectable H{sub 2}O{sub 2} in the soil by three times the depth in soil columns without stabilization. The oxidation of sorbed hexadecane, a highly hydrophobic compound (log K{sub ow} = 9.07), by Fenton-like reactions focused on the process variables of H{sub 2}O{sub 2} concentration, number of H{sub 2}O{sub 2} applications, and pH. A single application of 15 M H{sub 2}O{sub 2} with pH governed by the buffering of KH{sub 2}PO{sub 4} provided maximum hexadecane oxidation. Minimal desorption (<10%) in the soil columns was found in control experiments using deionized water in place of H{sub 2}O{sub 2}, suggesting that hexadecane oxidation occurred in the sorbed phase. More detailed investigation of the process variables was conducted using central composite rotatable designs. The results showed that a KH{sub 2}PO{sub 4} concentration greater than 30 mM provided increased hexadecane oxidation while maintaining minimal H{sub 2}O{sub 2} decomposition relative to unstabilized H{sub 2}O{sub 2}. For higher KH{sub 2}PO{sub 4} concentrations (60--75 mM), the central composite results documented greater than 90% hexadecane oxidation in the top 2 cm of the soil column and 20--40% oxidation in the 10--15 cm depths.
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States)
- OSTI ID:
- 419592
- Journal Information:
- Journal of Environmental Engineering, Journal Name: Journal of Environmental Engineering Journal Issue: 1 Vol. 123; ISSN 0733-9372; ISSN JOEEDU
- Country of Publication:
- United States
- Language:
- English
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