异位间接两级热脱附技术在有机污染土壤修复工程中的应用

以某有机污染土壤热脱附修复工程为例,考察了自研异位间接两级热脱附设备特点、工艺流程、温度监控以及尾气排放达标情况,以探究异位热脱附技术在有机污染土壤修复工程中的应用.应用结果表明,在一级加热炉膛温度300℃、二级加热炉膛温度500℃,停留时间为30 min的条件下,能实现污染土中石油烃、苯系物和多环芳烃类复合有机污染物...

Application of ex-situ indirect two-stage thermal desorption in remediation of organic contaminated soil

This study clarified the characteristics of ex-situ indirect two-stage thermal desorption equipment, process design, temperature monitoring and off-gas emissions in the application of thermal desorption for the remediation of organic contaminated soil. The results showed that with the temperatures of primary and secondary heating furnaces at 300 ℃ and 550 ℃, respectively and residence time of 30 min, contaminants including petroleum hydrocarbons, BTEX and polycyclic aromatic hydrocarbons in soil can be removed effectively. Off-gas and wastewater were treated by condensation-adsorption and oxidation-coagulation, respectively, and the treated effluents could meet the air and water quality standards. This study demonstrated that the indirect two-stage thermal desorption equipment is suitable for the ex-situ remediation of contaminants in the soil.