Reduction of Nitrate in Water by Nanoscale Zero-Valent Iron Particles and Zeolite

In this study, nitrate reduction using laboratory synthesized nanoscale zero-valent iron (NZVI) was discussed. On the other side, denitrification of nitrate with Fe⁰ nanoparticles combined with zeolite was also investigated. The effects of iron-to-nitrate ratio and the affiliation of zeolite were studied systemically. The results show that nitrate with the concentration of 80 mg/L was mostly removed within 60 minutes, and the endproducts mainly are ammonia with Fe⁰ but little ammonia with Fe⁰ and zeolite. The role of nanoscale iron in the nitrate reduction should be take part in two major processes: (a) directly participate in the redox reaction; and (b) adsorption of nitrate. And the role of zeolite in nitrate reduction was only the absorption ammonia.