Ion-exchange demanganation of drinking waters in the Oktyabrsky District of the Jewish Autonomous Region

Abstract

The aim of the study is the analysis of the possible use of ion-exchange demanganization of drinking water in the Oktyabrsky District of the Jewish Autonomous Region to reduce the concentration of manganese to a value below MPC. For the ion-exchange demanganization of drinking water, a domestically-produced KU-2-8 ES cation exchanger and an imported Purolit C120 E cation exchanger were used as adsorbents. We used four different methods, reproducing purification with drinking filters in domestic conditions. We have determined that among 33 analyzed water samples, 16 of them, which were combined into groups No. 2 and No. 4, exceeded the MPC value for gross manganese. This fact indicates that these waters require treatment and conditioning for drinking purposes. We have revealed the ranges of concentrations for indicators of the physiological relevance of water: The total hardness is 1.5-7 meq / dm3, the calcium content is 25-130 mg / dm3, and the magnesium content is 5-65 mg / dm3. This fact indicates that the concentrations of calcium and magnesium, as well as the total hardness in the water, are below the lower limits of their physiologically relevant concentrations in drinking water.