中文摘要：

针对南京某化工厂搬迁遗留的硝基氯苯污染的场地土壤,采用零价铁还原与氧化剂氧化的联合体系,研究了四种氧化剂对邻位、对位和间位硝基氯苯的降解率,以及不同氧化剂（高锰酸钾、芬顿试剂、30%过氧化氢和过硫酸钠）的浓度、零价铁添加剂量与体系p H值对土壤中硝基氯苯（邻位、对位和间位）降解效率的影响。结果表明,经零价铁还原1 h后,再添加氧化剂氧化处理,对土壤中硝基氯苯有较好的降解效果,四种氧化剂对硝基氯苯降解率大小顺序为高锰酸钾〉芬顿试剂〉30%过氧化氢〉过硫酸钠,硝基氯苯的降解率分别为94.2%、90.4%、88.5%和74.9%;邻位和对位的硝基氯苯降解率大于间位;随着氧化剂浓度和零价铁剂量的增加以及p H值的下降,硝基氯苯的降解率不断增加。p H值为6.8时,零价铁添加0.5 mmol·g-1,氧化剂添加2.0 mmol·g-1,可作为该场地土壤中硝基氯苯理想的降解修复条件。

英文摘要：

To remove nitrochlorobenzenes in contaminated soil after relocation of Nanjing Chemical Company,a chemical reaction system combining zero-valent iron reduction with oxidants oxidation system has been used to study degradation of ortho-chloronitrobenzene（ o-NCB）,meta-chloronitrobenzene（ m-NCB）,and para-chloronitrobenzene（ p-NCB） with four kinds of oxidants. Effects of concentrations of the oxidants（ potassium permanganate,hydrogen peroxide,Fenton reagent and persulfate）,dosages of zerovalent iron and the p H on the removal were investigated. The results showed that the NCBs were reduced by zero-valent iron after 1 h,followed by the oxidant treatment,the degradation effect of NCBs was significant. The order of the removal of NCBs was tested as potassium permanganate Fenton reagent 30% hydrogen peroxide persulfate. The removal rates of NCBs were 94. 2%,90. 4%,88. 5% and74. 9%,respectively. The removal rates of o- and p-NCBs were higher than m-NCBs. The NCBs removal rate increases with increase of the concentration of oxidant,zero-valent iron dosage and decrease of the initial solution p H. It was an optimal process to removal of NCBs in soil at the p H value of 6. 8,zerovalent dosage of 0. 5 mmol·g-1,and oxidant concentration of 2. 0 mmol·g-1.