活化过硫酸钠湿式加药法对苯并[a]芘污染土壤修复效果研究

Study on the Remediation Effect of Activated Sodium Persulfate Wet Dosing Method on Benzo[a]Pyrene Contaminated Soil

以上海桃浦某多环芳烃污染场地为例,选用湿法加药和干法加药两种不同的过硫酸钠投加方式对污染土壤修复情况进行探讨。探讨过程分为实验室小试、现场中试及工程实践三部分。通过实验室小试明确了2%生石灰+2%过硫酸钠的药剂投加量可以有效地去除污染土壤中的苯并[a]芘。现场中试结果表明,采用湿法加药的方式对土壤中苯并[a]芘的去除率可达86.67%。对比本项目(湿法加药)的工程实践情况与上海桃浦地区另一典型项目(干法加药)的实践情况,表明湿法加药可以显著提高土壤修复一次达标率。

Taking a polycyclic aromatic hydrocarbons(PAHs)contaminated site in Taopu,Shanghai,as an example,two different methods of adding sodium persulfate,wet method and dry method,were selected to investigate the remediation of contaminated soil.The discussion process is divided into three parts:laboratory test,on-site pilot test,and engineering practice.Through laboratory tests,it has been determined that the dosage of 2%quicklime+2%sodium persulfate can effectively remove benzo[a]pyrene in contaminated soil.The field pilot test results show that the removal rate of benzo[a]pyrene in soil by wet dosing method can reach 86.67%.Comparing the engineering practice of this project(wet dosing)with the practice of another typical project(dry dosing)in Taopu District of Shanghai,it is shown that wet dosing can significantly improve the primary compliance rate of soil remediation.