过硫酸盐高级氧化技术修复土壤原油污染研究

Study on Repairing Soil Crude Oil Pollution by Persulfate Advanced Oxidation Technology

分别以H_2O_2和FeSO_4·7H_2O活化Na_2S_2O_8,以柠檬酸为螯合剂,考察过硫酸钠经活化螯合之后对石油污染土壤中总石油烃和多环芳烃的去除效果,并比较两种活化剂对过硫酸钠活化效果。实验结果表明:无螯合剂的情况下,经H_2O_2和FeSO_4·7H_2O活化的过硫酸钠对污染土壤中总石油烃降解率分别为87.8%和89.9%;在均未活化的情况下,经螯合的过硫酸钠对总石油烃的降解86.9%,较未螯合的过硫酸钠降解率要高出2个百分点;以柠檬酸为螯合剂的情况下,经H_2O_2和FeSO_4·7H_2O活化的过硫酸钠对污染土壤中总石油烃降解率分别达92.4%和91.9%,苯并(b)荧蒽、二苯并(a,h)蒽、苯并(a)芘、苯并(a)蒽降解率分别是98.8%,86.3%,93.3%,92.5%,过硫酸钠降解石油烃较未活化后的分别提高了5.96~12.08个百分点,多环芳烃提升不明显。

Na2 S2 O8 was activated by H2 O2 and FeSO4·7H2 O,and citric acid was used as a chelating agent to investigate the re⁃moval effect of total sulfuric acid and polycyclic aromatic hydrocarbons in petroleum-contaminated soil after activated chelation of sodium persulfate,and compare the two activators.Sodium sulfate activation effect.The experimental results show that in the ab⁃sence of chelating agent,the degradation rate of total petroleum hydrocarbons in contaminated soil by sodium persulfate activated by H2 O2 and FeSO4·7H2 O is 87.8%and 89.9%,respectively;in the case of no activation,sequestration The degradation of total pe⁃troleum hydrocarbons by sodium persulfate is 86.9%,which is 2 percentage points higher than that of unchelated sodium persulfate.In the case of citric acid as a chelating agent,persulfuric acid activated by H2 O2 and FeSO4·7H2 O.The degradation rate of total petroleum hydrocarbons in contaminated soil by sodium is 92.4%and 91.9%,respectively.Benzo(b)fluoranthene,dibenzo(a,h)fluorene,benzo(a)hydrazine,benzo(a)hydrazine degradation the rates were 98.8%,86.3%,93.3%,and 92.5%,respec⁃tively.The degradation of sodium persulfate was 5.96 to 12.08 percentage points higher than that of unactivated oil,polycyclic aro⁃matic hydrocarbons are not significantly enhanced.