Mechanisms and Affecting Factors of Nitrate Reduction by Zero-valent Iron

The mechanisms and affecting factors of nitrate reduction by zero-valent iron(Fe0) are reviewed,and the possible research topics in future are proposed.The dominating products of chemical denitrification by Fe0 are NH+4 and N2 under acidic conditions and under neutral conditions,respectively.Among the factors affecting denitrification by Fe0,pH is the most important one.Fe0/NO-3 loading rate,Fe0 dosage and mixing intensity are factors influencing denitrification rate while dissolved oxygen concentration has little effect on denitrification.Different co-existing ions have different effects on denitrification by Fe0.Since the efficiency of dinitrification by Fe0 is low,new technologies assisted with other methods will be the hot topics in future.