NEW TECHNOLOGIES FOR NITRITE AND NITRATE REMOVAL FROM DRINKING WATER ENVISAGING THE DIMINUTION OF HUMAN HEALTH RISK

摘要

The risk of nitrite and nitrate ingestion on human health comes from various sources, e.g., water, vegetables and meat produces. Nevertheless the maximum allowance concentration for nitrite and nitrate in drinking water is the smallest in comparison with vegetables and meat products, however water mainly contributes to human health risk because of the great exposure of the population to water ingestion. The treatment of natural zeolite with quaternary amines converted it into suitable compounds for retaining certain anions, i.e., nitrite and nitrate. Two types of organozeolites were used for the removal of nitrite and nitrate anions, namely DDAC (distearyl - dimethyl - ammonium -chloride), respectively SDBAC (stearyl - dimethyl -benzyl - ammonium -chloride). Two concentrations of quaternary amines, 100 and 200 mM were used to modify the zeolite. The organozeolite performances for the removal of nitrite and nitrate from water were determined.