Integrated ion exchange/catalytic process for efficient removal of nitrates from drinking water

摘要

A nitrate removal process that drastically reduces salt consumption and waste discharge has been developed on a bench scale. Nitrate is removed by chloride ion-exchange, and the storng-base anion resins is completely regenerated at mild reaction conditins (i.e., ambient temperature, atmospheric pressure) ina closed circuit containing a single-flow fixed-bed reacotr packed with a Pd-Cu/#amma#-Al_2O_3 catalyst. The combined treatment system avoids direct contact between the denitrification reactor and the water to be treated, and minimizes operational problems assocaited with each separate technique. No dissolution of Pd and Cu metallic phases was observed at the given operating conitions.