In order to control organic pollution in soil

ozone remediation of soil samples contaminated by 2

4-D(2

4-dichlorophenoxyl acid) was studied in a simulated soil columns. The effect of several factors such as addition of hydroxyl radical inhibitors

soil particle sizes

amount of O3 in O3-O2 mixed gas and moisture content in soil

on the kinetics of ozone remediation(2

4-D degradation) was investigated. To observe influence of water content on the kinetics

various volume of deionized water was added to the soil samles. The experimental results show that all ozone in gas-liquid phase

hydroxyl radicals in liquid-film and active sites on the surface of soil particles play roles in 2

4-D degradation in soil by ozone. For ozone remediation of moist soil there exist gas phase

liquid phase and solid phase

the contact between gas-liquid-solid phases is very important. The 2

4-D degradation by ozone follows the pseudo-first-order kinetics if reasonable simplification and hypothesis are added

and fitting correlation coefficients are higher than 0.9. A kinetic model of soil remediation proposed depends on soil water content. The experimental data reveal that the pseudo-first-order rate constants are fitted well with quadratic polynomial for the range of water content 0-9.38%(mass).