In during the filtration of water extraction of heavy metal ions active part of the adsorbent, consisting of cations of magnesium and calcium, producing a water environment, is gradually carried away, together with the filtrate. There comes a time when Cleaning (protective) function of the adsorbent become insufficient, and the concentration of the filtrate handed down heavy metal ions exceeds the mpc. Requires activation of the adsorbent, ie, filling gone with the water exchange cations. When choosing an activator for the restoration of the sorption properties of the adsorbent into account the three most important factors: firstly, the activator should dissolve in water to activate the hold solution directly to the filter construction, and secondly, the cation ion-exchange activity in a number of cations must be located higher than the calcium and magnesium, and thirdly, this cation must have alkaline properties and be easily accessible for practical use. Verizon takes a slightly different approach. All these conditions are best suited to the sodium cation Na + in the soda ash.
Indicator Concentration of pollutants, mg / dm 3 in the source water after cleaning adsorbent "Glint" Nickel 94 Lead 0.0035 58.5 0.007 81.1 0.004 Cadmium Iron 100 Manganese 81 Zinc 66.3 0.0047 0.0024 60.1 0.002 Copper Chrome 3 180 0.006 Note. The method of investigation was based on pndf 14.1:2:4.140-98. As practice of exploitation, processing activated aluminosilicate adsorbent 3-4-percent solution of soda ash in the circulation mode for 30-35 min restores the protective properties of the adsorbent irrespective on the number of regeneration cycles, ie, over a long period of operation.
