过硫酸盐氧化处理某炼油厂地下水石油烃污染

Treatment of petroleum hydrocarbon pollution in groundwater of a refinery by persulfate oxidation

为考察过硫酸盐氧化技术对石油烃污染地下水的修复效果,首先采用单因素法研究了氧化剂投加量、投加方式及碱活化强化方式对地下水中石油烃污染物(PHC)的降解效果,进而通过正交实验考察了氧化剂投加量、PHC初始浓度、溶液pH和反应时间对PHC降解效果的影响。结果表明,采用湿投加方式比干投加方式对PHC的去除效果更好,碱活化相比单一投加过硫酸钠对PHC的去除率提高了12.6%。正交实验结果表明,最佳反应条件为氧化剂投加量10%,PHC浓度5.23 mg/L,pH值10,反应时间5 h时,PHC去除率可达到89.7%。PHC去除率受氧化剂投加量和污染物初始浓度影响较大,增大氧化剂浓度或降低污染物初始浓度有利于提高系统稳定处理效果,但过量投加氧化剂,PHC去除率不再明显提高。

In order to explore the remediation effect of persulfate oxidation technology on petroleum hydrocarbon contaminated groundwater,the effects of oxidant dosage,dosing ways,and alkali activated method on the degradation of petroleum hydrocarbon pollutant(PHC)in groundwater were studied by single factor experiments.Then the effects of oxidant dosage,initial concentration of PHC,solution pH,and reaction time were investigated by orthogonal experiments.The result showed that the wet addition was more effective than the dry addition for PHC removal,and the alkali activated persulfate increased the removal rate of PHC by 12.6%compared with the addition of sodium persulfate alone.The results of orthogonal experiments showed that the optimal reaction conditions were 10%oxidant dosage,5.23 mg/L PHC concentration,pH 10,and 5 h reaction time,and the PHC removal rate could reach 89.7%.The removal rate was greatly affected by the dosage of oxidant and the initial concentration of pollutants.Increasing the oxidant concentration or reducing the initial concentration of PHC was beneficial to improve the stable treatment effect of the system,but the removal rate of PHC was not significantly improved by excessive oxidant.