CHEMICAL DENITRIFICATION OF NITRATE FROM GROUNDWATER VIA SULFAMIC ACID AND ZINC METAL

Nitrate contamination in drinking water can cause methemoglobinemia, which is especially detrimentalto infants and nursing mothers. batch experiments in two units for catalytic reduction of nitrate fromgroundwater with zn catalyst and sulfamic acid were conducted. the system includes chemicaldenitriphication (chemden reactor) and electrolytic recovery reactoers. a batch study was conducted tooptimize parameters like ph, sulfamic acid concentration, zn concentration, temperature and reactiontime governing the chemden process. the concentrations of remained nitrate and zn were measured atthe end of the reactions. results showed that near to 100% of nitrate decreased and the quantity ofremained nitrate was <1 mg/l. ph and agitation had great effect on denitrification, and the nitrateremoval rate changed rapidly when ph value ranged between 3-4. two water quality parameters whichlimit this process were sulfate and chloride ions concentrations in nitrate contaminated water.