亚铁活化及铁碳强化过硫酸钠氧化法修复模拟机油污染土壤

分别采用传统的Fe²⁺活化过硫酸钠(Na_2S_2O_8)氧化和铁碳强化Na_2S_2O_8氧化两种方法修复模拟机油污染土壤。实验结果表明:对于传统Fe²⁺-Na_2S_2O_8体系,在Na_2S_2O_8投加量为3.0%(w)、Fe SO4·7H2O投加量为0.6%(w)的优化条件下,土壤中总石油烃(TPH)的去除率仅为33.12%;而对于Fe^0-C-Na_2S_2O_8体系,在Na_2S_2O_8投加量为1.0%(w)、还原铁粉和活性炭的投加量均为0.1%(w)的优化条件下,土壤中TPH的去除率为42.99%;Fe^0-C-Na_2S_2O_8体系较Fe²⁺-Na_2S_2O_8体系对土壤具有更好的修复效果,且Na_2S_2O_8的投加量减少了2/3。此外,Fe^0-C-Na_2S_2O_8体系较Fe²⁺-Na_2S_2O_8体系对土壤pH的影响小,在实际应用中可适当提高铁粉的投加量来减小Na_2S_2O_8对土壤pH的影响。

Remediation of simulated engine oil contaminated soil by ferrous activated and iron-carbon enhanced sodium persulfate oxidation process

The simulated engine oil contaminated soil was treated by the traditional Fe²⁺ activated sodium persulfate（Na₂S₂O₈）oxidation process and iron-carbon enhanced Na₂S₂O₈ oxidation process,respectively. The experimental results showed that：The removal rate of total petroleum hydrocarbon（TPH）in soil was only 33.12% by the traditional Fe²⁺-Na₂S₂O₈ system under the optimum conditions of Na₂S₂O₈ amount 3.0%（w）and FeSO₄·7H₂O amount 0.6%（w）,while the removal rate of TPH in soil was 42.99% by the Fe⁰-C-Na₂S₂O₈ system under the optimum conditions of Na₂S₂O₈ amount 1.0%（w）and both reducing iron powder and activated carbon 0.1%（w）;In addition,the Fe⁰-C-Na₂S₂O₈ system had less impact on soil pH than the Fe²⁺-Na₂S₂O₈ system. In practical application,the amount of iron powder could increase advisably to reduce the effect of Na₂S₂O₈ on soil pH.