AWWA ACE59939

The process of bromate reduction by zero valent iron (Fe(0)) has been found to be controlled by surface mediated reactions, which are strongly related to the surface status. The effect of natural organic matter (NOM) on the bromate reduction by Fe(0) was investigated to examine the interactions between humic acid and the iron surface. Small decreases in the bromate reduction were observed with simultaneous additions of humic acid and bromate. The adsorbed humic acid on the iron surface was found to compete with bromate reduction by acting as a passive film between inner Fe(0) and bromate. Therefore, the effect of humic acid was more significant by 24-hour presoaking Fe(0) with humic acid. The complexation of humic acid with active ferrous ions (Fe(II)) in aqueous phase was found to affect bromate reduction by Fe(II). In this study, functional groups, OH^- and COO^- in humic acid detected by FTIR spectroscopy were found to complex with irons, and consequently led to the dissolution of iron oxides and irons. Includes 30 references, tables, figures.