多氯联苯污染土壤的Fenton试剂化学修复效应

采用室内模拟实验,研究了0.5mol/LFeSO4溶液与1.0mol/LH2O2溶液组成的Fenton试剂对污染土壤中PCBs的去除效果。结果表明:20ml FeSO4+40ml H2O2的Fenton试剂对PCBs污染土壤处理336h后,PCBs总量的去除率达71.9%,继续增加Fenton试剂剂量或延长Fenton反应时间对PCBs去除效果影响较小。Fenton试剂对三氯、四氯、五氯、六氯等PCBs同系物去除效果较好,去除率分别为92.5%、75.8%、51.4%、39.5%。加入Fenton试剂后,供试土壤的pH值出现明显降低,而对土壤有机质含量的影响不明显。可见,该剂量的Fenton试剂对PCBs污染土壤的修复有明显的效果,是一种可利用的环境修复材料。

Chemical remediation effect of Fenton reagent on PCB-contaminated soils

Effects of Fenton reagent made of 1mol/L H2O2 and 0.5mol/L FeSO4 on chemical remediation of PCB-contaminated soils were studied under indoor culture condition. The results showed that the removal rate of soil PCBs reached to 71.9% after the soil being treated with 20ml FeSO4 and 40ml H2O2 for 168 hours, but later, this removal effect changed a little with the increase of Fenton reagent dose and reaction time. The removal rate of Tri-Cl to Hexa-Cl PCBs in soil were 92.5%, 75.8%, 51.4% and 39.5% respectively. After adding Fenton reagent, soil pH decreased obviously while soil organic matter content changed little. The results indicated that Fenton reagent can remove effectively PCBs in soil, it is an available material for chemical remediation.