中文摘要：

通过柱试验研究硝酸根对颗粒铁除铬的影响.颗粒铁对Cr（VI）的去除符合准一级动力学.试验初期,NO3^-与Cr（VI）同时还原并形成NH4＋,100mg·mL^-1NO3^-的存在能明显增大颗粒铁对Cr（VI）的去除速率,随后这种作用减弱.柱体内颗粒铁对Cr（VI）的去除受阳极区域释放Fe^2＋的能力影响,硝酸根促进颗粒铁的腐蚀而不会对阳极钝化,从而在试验初期促进颗粒铁对铬的还原去除.

英文摘要：

In this study,Column experiments are conducted to determine the effects of nitrate on the removal kinetics of Cr（VI）by granular iron.Hexavalent chromium reduction by granular iron can be described by pseudo first order kinetics.The early nitrate reduced by granular iron to ammonia and can remarkably increase kSAof hexavalent chromium reduction by granular iron.Subsequently,the enhancement of nitrate becomes weaker and weaker.Hexavalent chromium removal is affected by the ability of iron to release Fe^2＋ at anodic sites.Nitrate promotes iron corrosion and does not result in anodic passivation at early experiment,but enhances hexavalent chromium reduction by granular iron.