Experimental and theoretical studies on volatilization process of heat-enhanced organic pollutants from soils

In order to study the laws of volatilization removal of organic pollutants from soils and the influencing factors of volatilization process under heat-enhanced conditions, the indoor volatilization model experiments are designed. The laws of volatilization removal at different temperatures and initial pollutant concentrations are studied. The results show that the volatilization process curve can be divided into three stages: fast volatilization stage, stable growth stage and balanced volatilization stage. In addition, the higher the initial concentration of pollutants, the higher the proportion of free-phase pollutants, so the rate of volatilization is getting faster. When the temperature increases from 40℃ to 80℃, the average volatilization rate of sand increases by 4.0 to 4.8 times. Considering the correlation of the fitting equation, the volatilization process of organic pollutants from soils conforms to the first-order kinetic model.