DEFERRIZATION IN LOCAL WATER SUPPLY SYSTEMS

For deferrization of water in local water systems can be used freeflow schemes and pressure technological schemes, which differ by filter's construction, the type of download, ease of use, automation level, the presence of additional equipment, dimensions, etc. At using pressure deferrization schemes is complicated placing aeration of water. It is advisable to carry out enhanced aeration of the water with outflow into the well that requires minimum costs for aeration equipment using pressure foam polystyrene filters with aeration at recycle. Necessary level of recirculation depends on the efficiency of the aerator's work, concentration of ferrous iron and other substances absorbing oxygen, etc. Effectiveness of work the foam polystyrene pressure filter with aeration at recycle investigated in natural conditions. The quality of underground water did not correspond the consumer requirements for total iron concentration (2.0 mg/dm3). Enough high pH values (7.3 units) and alkalinity (7.0 mol/m3) allows using a method of contact water deferrization. Samples were selected and determined concentration of iron: after washing 0.15 mg/dm3, at the end of filtering (on the seventh day) 0.04 mg/dm3. Thus, the foam polystyrene pressure filters with aeration at recycle provide a sufficient degree of water deferrization at a lower water cost.