WATER SOFTENING AND DEFERRIZATION PROCESS Russian patent published in 2003 - IPC

FIELD: water treatment. SUBSTANCE: process is realized in liquid-gas ejector with air at excess pressure no higher than 0.03 atm and water supply velocity by 25% exceeding sound speed in water-air system. Water is further filtered and, if necessary, subjected to disinfecting UV irradiation. When air treatment is conducted, process proceeds at reduced absolute pressure equal to 0,3-0.7 atm. In cases of high iron content and low carbonate hardness, air is fed under atmospheric pressure and, in cases of high carbonate hardness and low iron content, air is fed under excess pressure no higher than 0.3 atm. Treated water contains Fe ≤ 0.3 mg/l and Ca ≤ 80 mg/l. EFFECT: increased softening and deferrization efficiency. 5 cl, 1 dwg, 1 tbl, 2 ex