异位热脱附修复技术对高浓度多环芳烃污染土壤的修复应用实例

Case Study of Ex-situ Thermal Desorption Remediation on Contaminated Soil with High Concentration of PAHs

以上海市某地块高浓度多环芳烃污染土壤修复工程为实例,通过实验室小试和现场中试确定多环芳烃污染土壤热脱附修复加热温度和时间工艺参数,并对修复过程进行了详细描述。实验证明,在加热300℃以上且加热时间在1 h以上条件下,5种目标污染物苯并(a)蒽、苯并(b)荧蒽、苯并(a)芘、茚并(1,2,3-cd)芘、二苯并(a,h)蒽能够有效被去除;在工程中当热脱附系统控制反应温度350℃且加热反应时间1 h时,修复后土壤检测结果均符合效果评估要求,修复后土壤采用原位回填的方式处置。该应用案例对异位热脱附修复技术的工艺研究和工程应用具有一定的指导意义。

Taking a case of one polyaromatic hydrocarbon(PAHs)contaminated soil remediation project in Shanghai,this paper has determined the parameters of the thermal desorption remediation heating temperature and time by lab experiment and piolt scale test and explained the treatment process in details.The experiments show that five target contaminants(included BaA,BbF,BaP,InP and DBA)can be removed effectively at the temperature above 300 oC and the heating time more than 1 h.In the remediation project,all the treated soil has satisfied with the remediation standard at 300 oC for 1 h,and then in-situ backfilled.This case study is significant to the technical study and the engineering application for ex-situ thermal desorption remediation in the future.