化学氧化修复有机物污染土壤技术及工程实践

Process Study and Pro,ject Practice on Chemical Oxidation for Remediation of Organic Contaminated Soil

以化工厂关停之后遗留的有机物污染土壤为研究对象,研究了碱活化过硫酸钠氧化修复有机物污染土壤的效果,对过硫酸钠用量、精石灰用量、药剂作用时间等影响因素进行了优化。结果表明:在氧化条件下,随着氧化剂用量的增加和药剂作用时间的延长,土壤中有机物的含量呈现先下降后稳定的趋势,最优试验条件为过硫酸钠用量5%,精石灰用量1%,药剂作用时间5d。工程实践表明,在此条件下,土壤中的有机污染物均可降低至修复目标值以下,该化学氧化技术应用于有机物污染土壤修复是可行的。

The effects of alkali-activated sodium persulfate as oxidant to restore the organic contaminated soil left after the shut down of chemical plant were studied for the first time.The influencing factors such as the amount of sodium persulfate,the amount of refined lime and the action time of the agent were optimized.As a result,the total organic matter decreased first and then stabilized with the increase of the oxidant amount and the extension of the action time.The optimal experimental conditions were obtained as follows:5% sodium persulfate,1% refined lime,effect time 5 days.Under this condition,all of the remediation targets were achieved in actual project.The oxidation technique in this study was feasible to restoring the contaminated soil by sodium persulfate.