【摘要】 以过氧化氢（H₂O₂）和过硫酸钠（Na₂S₂O₈）为氧化剂,通过室内模拟实验,研究不同氧化剂及分次添加方式（1次或分3次）、外源添加零价铁（ZVI）处理对石油污染土壤中石油烃类污染物的去除能力,探讨了不同处理下氧化剂的持续性和去除污染物的有效性。结果表明:在氧化剂初始浓度为21、63、105 mmol·L^-1的处理中,H₂O₂在反应第2 d均已检测不到,Na₂S₂O₈剩余量在反应10 d后分别为11、35、60 mmol·L^-1;反应10 d后,总石油烃类（TPH）总去除率在氧化剂初始浓度为63、105 mmol·L^-1的Na₂S₂O₈处理中显著高于H₂O₂处理（P<0.05）,分别高出12.41%、14.21%;在第4～10 d Na₂S₂O₈和TPH剩余浓度的降低均非常缓慢,表明土壤中能活化Na₂S₂O₈的物质不足;加入ZVI显著提高了TPH总去除率（P<0.05）,尤其促进了第4～10 d TPH的持续降解（分别增加了8.46%、8.49%、12.26%）。总量相等的H₂O₂分3次在第0、24、48 h投加,反应10 d后TPH降解率比一次性投加分别提高了17.26%、25.43%、28.11%。通过对反应体系有机组分的GC-MS图谱分析,反应10 d后H₂O₂分3次添加、ZVI活化Na₂S₂O₈处理中石油烃类总峰值分别降低了56.64%和57.60%,且部分长链烷烃被降解为相对较短的烷烃组分。研究表明:Na₂S₂O₈在石油污染土壤中持续性优于H₂O₂,但Na₂S₂O₈去除TPH的有效性随反应时间增加而降低;添加ZVI提高了Na₂S₂O₈去除TPH的有效性;分批次投加H₂O₂提高了石油污染土壤中的TPH降解率。更多还原

【Abstract】 Hydrogen peroxide（H₂ O₂）and sodium persulfate（Na₂S₂O₈）were used to treat petroleum-contaminated soil in laboratory experiments. The influences of different oxidants, fractional addition methods（1 or 3 times）, and external addition of zero-valent iron（ZVI）on the degradation of total petroleum hydrocarbon（TPH）were investigated. The persistence of oxidants and the effectiveness of removing pollutants under different treatments were discussed. The results showed that H₂ O₂ was not detected on the second day of the reaction, but the remaining amount of Na₂S₂O₈ was 11, 35, and 60 mmol·L^-1, respectively, after 10 days of reaction in treatments with initial oxidant concentration at 21, 63, and 105 mmol·L^-1. After 10 days of reaction, the total removal rate of TPH in Na₂S₂O₈ treatment was 12.41% and 14.21%higher than that in H₂ O₂ treatment with the initial oxidant concentration at 63 mmol·L^-1 and 105 mmol·L^-1（P<0.05）, respectively. The decrease of Na₂S₂O₈ and TPH residual concentration was extremely slow on the 4 th to 10 th day, indicating that the substances capable of activating Na₂S₂O₈ were insufficient in the soil. Adding ZVI to Na₂S₂O₈ treatment significantly promoted the total removal rate of TPH（P<0.05）, and the degradation of TPH during days 4～10 increased by 8.46%, 8.49%, and 12.26%, respectively, with initial oxidant concentration at 21, 63,and 105 mmol·L^-1. When H₂ O₂ was added in three portions at 0, 24, and 48 h, with initial total oxidant concentration at 21, 63, and 105 mmol·L^-1, TPH degradation rate rose by 17.26%, 25.43%, and 28.11%, respectively, after 10 days of reaction. GC-MS analysis of the organic components showed that the total peak area of petroleum hydrocarbons decreased by 56.64% and 57.60%, respectively, in treatments with H₂ O₂ added in three portions and ZVI-activated Na₂S₂O₈, and some long-chain alkanes were degraded to relatively"short-chain"alkane component. The overall results show that persistence of Na₂S₂O₈ in petroleum-contaminated soil is superior to that of H₂ O₂, but the effectiveness of Na₂S₂O₈ in removing TPH decrease with the reaction time. The addition of ZVI improve the effectiveness of Na₂S₂O₈ in removing TPH. FractionaladditionofH₂ O₂（added three times）increase the degradation rate of TPH in petroleum-contaminated soils.更多还原