过硫酸盐修复石油烃污染场地的小试试验探究

Pilot Test for Remediation of Petroleum Hydrocarbon Contaminated Sites by Persulfate

以广东省某工业场地石油烃污染土壤为试验土样,探究了过硫酸盐(Na_(2)S_(2)O_(8))在不同投加梯度下的单独作用效果,以及经(FeSO 4·7H 2 O)Fe^(2+)、Fe^(2+)/柠檬酸(CA)、生石灰(CaO)活化后对初始石油烃(TPH)浓度为4470mg/kg的污染土壤的氧化降解效果影响。试验结果表明,单独过硫酸钠降解作用下效果较温和,在9%Na_(2)S_(2)O_(8)用量下,TPH降解率仅8.4%;经Fe^(2+)、Fe^(2+)/CA、CaO活化后,降解效果均有显著提升,2%Fe^(2+)+5%Na_(2)S_(2)O_(8)作用下降解率可达39%;6%CaO+5%Na_(2)S_(2)O_(8)作用下,降解率可提高至58%;经5%过硫酸钠+2%CA+6%Fe^(2+)作用后,TPH降解率最高可达85%,完全可满足场地修复目标要求,也为广东省同类型污染场地的修复治理提供技术参考。

Soil contaminated by Petroleum Hydrocarbon of an industrial site in Guangdong Province were chosen the test soil sample,the effects of persulfate under different dosing gradients、Fe^(2+),Fe^(2+)/citric acid and quicklime activation on the oxidation degradation of 4470 mg/kg initial petroleum hydrocarbon(TPH)in polluted soil were studied respectively.The results showed that the degradation rate of TPH was only 8.4%when 9%sodium persulfate was used.After activated with Fe^(2+),Fe^(2+)/citric acid and quicklime,the degradation rate can reach 39%after 2%Fe^(2+)+5%Na_(2)S_(2)O_(8),and 58%after 6%CaO+5%Na_(2)S_(2)O_(8).and the maximum degradation rate of TPH can achieved 85%at 5%Na_(2)S_(2)O_(8)+2%CA+6%Fe^(2+),which can completely meet the requirements of site restoration,and also provides a technical reference for the remediation of similar polluted sites in Guangdong Province.