ENGINEERING APPLICATION OF ENHANCED ROOM TEMPERATURE DESORPTION IN REMEDIATION OF SOIL CONTAMINATED BY CHLORINATED HYDROCARBONS
To study the effect of this technology on the removal of different chlorinated hydrocarbons,a chlorinated hydrocarbon polluted site in the Pearl River Delta was selected,and laboratory experiments and pilot-scale field experiments were carried out using the room temperature desorption technology enhanced by chemical oxidation.The results showed that after room temperature desorption,the average removal rates of contaminants such as vinyl chloride,trichloroethylene,and tetrachloroethylene in the soil were all above 80％.After alkaline activation and sodium persulfate chemical oxidation,except for tetrachloroethylene in heavily polluted soil,the removal rates of contaminants in the soil were all above 90％.Different levels of pollution in the soil had achieved the remediation target values for vinyl chloride,trichloroethylene,and tetrachloroethylene.After on-site remediation,the soil chloroethylene,trichloroethylene,and tetrachloroethylene all reached the remediation target values.The initial concentration of contaminants has a great influence on the removal of chlorinated hydrocarbons.The higher the initial concentration,the higher the desorption rate of chlorinated hydrocarbons.Engineering practice has shown that the enhanced normal temperature desorption proposed in this study is feasible for the remediation of chlorinated hydrocarbon polluted soil.
soil remediationenhanced room temperature desorptionchemical oxidationchlorinated hydrocarbonsorganic contaminated site
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