title: Characteristics in oxidative degradation by ozone for saturated hydrocarbons in soil contaminated with diesel fuel.
abstract: Although alkanes are relatively less reactive to chemical oxidation compared to alkenes, the chemical oxidation of alkanes has not been adequately explored in the context of environmental remediation efforts. Laboratory-scale column experiments were therefore conducted with soil artificially contaminated by diesel fuel as a surrogate for alkanes of environmental relevance. Particular attention was paid to saturated hydrocarbons refractory to volatilization. Reaction conditions involve 1485mgkg(-1) of the initial concentration of diesel range organics (DRO) and a constant ozone concentration of 119+/-6mgl(-1) at the flow rate of 50mlmin(-1). The observed removal of DRO reached 94% over 14h of continuous ozone injection. Ozone oxidation demonstrated effective removal of non-volatile DRO in the range of C(12)-C(24). Each alkane compound displayed comparable degradation kinetics, suggesting virtually no selectivity of ozone reactions with alkanes in soil. A pseudo-first order kinetic model closely simulated the removal kinetics, yielding a reaction rate constant of 0.213 (+/-0.021)h(-1) and a half-life of 3.3 (+/-0.3)h under the experimental conditions used in this study. An estimate of ozone demand was 32mg of O(3) (mgDRO)(-1).
authors.affiliation: School of Civil Engineering, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907-2051, United States. doyun_yu@yahoo.com
authors.forename: Do-Yun
authors.initials: DY
authors.lastname: Yu
authors.forename: Namgoo
authors.initials: N
authors.lastname: Kang
authors.forename: Wookeun
authors.initials: W
authors.lastname: Bae
authors.forename: M Katherine
authors.initials: MK
authors.lastname: Banks
mesh_terms: D000473:Alkanes / Q000737:chemistry*; D005742:Gasoline; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*; D014835:Volatilization
chemical_list: D000473:Alkanes; D005742:Gasoline; D012989:Soil Pollutants; D010126:Ozone