电动力学-过硫酸钠氧化联用修复二氯苯污染土壤的研究

STUDY ON ELECTROKINETICS COMBINED WITH PERSULFATE OXIDATION FOR REMEDIATION OF DICHLOROBENZENE CONTAMINATED SOIL

为解决氯苯污染场地的修复问题,尤其是受污染的低渗透介质的原位修复问题,以1,2-二氯苯、1,3-二氯苯、1,4-二氯苯为研究对象,采用电动力学-过硫酸钠氧化联用技术,并在阳极室添加Na2CO3/Na HCO3缓冲液来控制阳极p H,探讨了土壤中3种二氯苯的迁移和去除效果。实验结果表明:在外加1.5 V/cm恒定电压,以铁为阴阳电极,以5 mmol/L Na2S2O8溶液作阴阳电极液,阳极液含0.025 mol/L Na2CO3/Na HCO3缓冲液,运行5 d后,该联用技术对污染壤土中3种二氯苯的总去除效果较好且较为均匀,去除率均在75%以上。该方法对于原位修复受污染的低渗透介质具备可行性。

In order to realize the remediation for chlorobenzene contaminated soil,especially in-situ remediation in low permeability media sites,electrokinetics combined with persulfate oxidation with Na2CO3/ Na HCO3 buffer added in the anode to control the anolyte p H,was used to remediate 1,2-dichlorobenzene,1,3-dichlorobenzene,1,4-dichlorobenzene contaminated soil. We discussed the effects of the migration and degradation of dichlorobenzene. The results showed that the removal effect of the contaminated loam was better and more balanced,with an average removal efficiency of more than 75%,under the condition of a voltage of 1. 5 V / cm,using Fe as cathode and anode,5 mmol / L Na2S2O8 solution as electrode solution with anolyte containing 0. 025 mol / L Na2CO3/ Na HCO3 buffer,running for 5 days. The method was proved to be workable for insitu remediation with low permeability media.