Effect of Surfactant Addition on Soil Thermal Desorption at Low Temperature
Thermal desorption technology is to raise the soil to a certain temperature,so that the organic matter in the soil is volatilized by heat and removed,but the organic pollutants in the soil usually need a higher temperature,so the repair energy consumption is high.In this study,the removal effect of ethylbenzene and p-nitrophenol from soil by azeotrope solution principle was studied by using CTAB,Trition-X-100 and 6501 as added reagents under the condition of desorption at low temperature less than 100 ℃.The results showed that the single azeotrope treatment could effectively accelerate the removal rate of ethylbenzene in soil,and the removal rate was up to 92.5％within 1.5 h.However,the removal rate of ethylbenzene was significantly accelerated after the addition of surfactant,and the removal rate of ethylbenzene was up to 99.99％within 1.5 h.However,at low temperature,the addition of surfactant has no great effect on the removal of p-nitrophenol,and the maximum removal is only 20％.Therefore,the feasibility of using azeotrope solution principle to remove semi-volatile organic compounds in soil needs to be further studied and demonstrated.
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