Study on Nitrate Removal with Nanoscale Zero-valent Iron Prepared by Hydrogen Reduced Goethite

摘要

It is well-known that nanoscale zero-valent iron (NZVI)has the high activity for nitrate removal,therefore,this paper carried out NZVI(14nm)prepared by hydrogen reduced natural goethite,then investigate the effect factors of nitrate removal,like initial pH value,nitrate concentration,dissolved oxygen(DO),iron-to-nitrate ratio,natural goethite grain size, and compare it with ordinary zero-valent iron (OZVI) through the static experiment.Results indicate that NZVI has little effect on the initial pH value during nitrate removal when compared with OZVI,and the removal rate of 90% within 5h was obtained for NZVI in reducing nitrate when iron-to-nitrate ratio was 40:1,and the nitrate concentration was 60mg/L. No nitrite was detected during the process.