石油污染土壤溶剂萃取过程的实验研究

Solvent extraction process of oil-contaminated soil

溶剂萃取是一种具有发展前途的土壤修复技术,可以快速有效地去除土壤中的有机污染物,同时还可以对具有一定价值的污染物进行回收利用.通过采用不同溶剂对石油污染土壤进行了萃取实验,最终选出了一种脱油率较高、环境友好且容易回收的复合溶剂TU-A.对于溶剂TU-A萃取石油污染土壤脱油率的研究发现,操作温度为室温,液固比为4∶1～6∶1,搅拌时间为5 min时,对于萃取脱油比较适合,而且含油率在10％以内的溶剂TU-A均可直接利用,无需进行溶剂再生.

Solvent extraction is a promising technology for soils remediation.Such method can be efficient in removing hydrophobic organic contaminants from polluted soils.Meanwhile,the contaminants can be recovered and recycled.A set of experiments of the solvent-extraction-based remediation of the oil-contaminated soil have been carried out with different solvents,and a solvent called TU-A has been chosen,which is higher oil-removing efficiency,eznvironmentally friendly and easily recyclable.The suitable operation conditions for extraction process are shown as follows：room temperature,4∶1 to 6∶1 of liquid-solid ratio and 5 minutes of stirring time.When the oil content of TU-A solvent is less than 10％,it can be directly used without the need for solvent regeneration.