Fe~(2+)活化过硫酸盐在石油污染土壤中修复实验研究

硫酸根自由基的高级氧化技术以高效率、污染少等优点被广泛用于环境污染治理。本文以实际石油污染土壤为对象,运用该体系对土壤进行修复研究,分别从Na_2S_2O_8/Fe~(2+)摩尔比、体系pH值、Na_2S_2O_8/Fe~(2+)投加量等方面开展了实验研究。实验表明:当Na_2S_2O_8/Fe2+摩尔比为2∶3时,石油污染物的降解效果最好,体系的pH值对降解效果影响不大,1 g土壤中浓度为0.1 mol/L的过硫酸钠和硫酸亚铁溶液的最佳加入量为2 m L、3 m L时,对土壤的降解效果最为明显,故每吨污染土壤的添加量大约为2×10~6m L、3×10~6m L。

Experimental study of the repair of Fe2+ activated persulfate in oil contaminated soils

Advanced oxidation technology based on sulfate radicals is widely used in environmental pollution control with high efficiency and low pollution. In this paper, the system was used to repair soil. Experimental study was carried out in the aspects of the Na₂S₂O₈/Fe²⁺ molar ratio, the pH value of the system and the dosage of Na₂S₂O₈/Fe²⁺. The results show that, when the molar ratio of Na₂S₂O₈/Fe²⁺ is 2:3, the degradation effect of oil pollutants is the best, and the pH value of the system has little effect on the degradation effect. The optimal amount of sodium persulfate and ferrous sulfate solution with 0.1 mol/L concentration is 2 mL and 3 mL in 1 g soil, the degradation effect of No.2 soil is most obvious. Therefore, the amount of contaminated soil per ton is about 2×10⁶ mL, 3×10⁶ mL.