中文摘要：

粒状铁渗透反应格栅是地下水铬污染的有效去除技术，在粒状铁去除六价铬的过程中，地下水中共存的氯离子对粒状铁的性能影响是渗透反应格栅技术能否成功运行的关键．为研究氯离子对颗粒铁还原去除Cr（VI）的影响，进行了实验室内批实验和柱实验研究，并测定了相应的铁腐蚀电位．批试验条件下，随溶液中Cl^-质量浓度由0mg／L增大到100mg／L，300mg／L和500mg／L，相应的KsA由7．76×10^-4Lmin^-1m^-2增大到8．68×10^4Lmin^-1m^-2，8．35X10^-4Lmin^-1m^-2“和1．38X10^-3Lmin^-1m^-2，而半衰期由8min减少到4．53min．当Cl^-质量浓度较低时（〈300mg／L），对Cr（Ⅵ）去除增强不很明显，当Cl^-质量浓度为500mg／L时，对Cr（VI）去除有较强的增强作用．柱实验表明，1000mg／LC^l-的存在，铁腐蚀电位降低，可促进钝化氧化物层的去除和铁的点状腐蚀从而增强颗粒铁对Cr（Ⅵ）的去除．设计铁渗透反应格栅处理铬污染地下水，要考虑氯离子的反应增强及加速铁材料消耗等2个方面影响．

英文摘要：

Iron permeable reactive barriers are an effective remediation of groundwater contaminated with hexavalent chromium. In the process of groundwater treatment , effect of coexist chloride ion on performance of the granular iron media is a main factor for the long - term performance. In the study , batch tests, column experiments and corrosion potential measurement were done to determine the effect of chloride ion on hexavalent chromium reduction by granular iron. When chloride ion concentrations ranging from 0 to 500 rag/L, thesurface area normalized rate coefficients （ksA） increased from 7.76 10^-4Lmin^-1m ^-2to 8.68 × 10^-4Lmin^-1 m-2 , 8.35 × 10^-4 Lmin^- m and 1.38 × 10^-3 Lmin^-1 m The half - lives decreased from 8min to 4.53min. With enhancement being unconspicuous when chloride ion concentration was lower than 300 mg/L, the increase in iron reactivity was strong when chloride ion concentration was higher than 500 mg/L. Results from column experiments show that the presence of 1 000 mg/L chloride ion decrease iron corrosion potential and promote removal of the passivating oxide layer and pitting corrosion of the iron, which can sustain and increase granular iron reactivity. When chloride iron concentrarion was higher than 300 mg/L, enhancement oniron reactivity and depletion of iron material should be taken into account in iron PRB design for chromate contaminated groundwater.