The Box-Behnken model was used to optimize the soil of a TCE contaminated site in Shanghai,and the technical parameters of the heat treatment technology applied to the TCE remediation project were obtained.The results show that the process of"low temperature thermal desorption+quicklime"is suit-able for low concentration TCE contaminated soil,and the removal rate is positively correlated with the amount of quicklime added.When the temperature reaches 45 ℃,the residual TCE concentration is 0.408 mg/kg,reaching the remediation target.Thermal desorption technique is suitable for medium and high concentration TCE contaminated soil.The optimal fitting model is quadratic model with R2=0.92.TCE pollution concentration has a strong positive correlation to soil TCE residue concentration,desorption time has a negative correlation,and water content has a weak negative correlation.The order of influence of each factor on soil TCE residue concentration after thermal desorption treatment is TCE pollution con-centration＞desorption time＞water content.
关键词
三氯乙烯污染土壤/低温热解吸/高温热脱附/Box-Behnken模型/工艺组合优化
Key words
TCE contaminated soil/low temperature thermal desorption/high temperature thermal desorption/Box-Behnken model/process combination optimization
维普
万方数据