WATER TREATMENT PROCESS Russian patent published in 2001 - IPC

FIELD: water treatment. SUBSTANCE: invention relates to ion-exchange technology for desalting and softening of water with simultaneous reduction of water alkalinity, which can be applied in powering engineering for production of high-quality conditioned water appropriate as heat carrier. For that, initial water is desalted on H- filters by consecutively passing it through carboxyl cationite and sulfonic cationite, after which water is treated on OH-filters. Softened water is prepared by consecutively or concurrently passing water through carboxyl and sulfonic cationites pretreated with spent OH-filter-regeneration solution, which is passed through cationites exhausted in water desalting operation in any order. H-filters exhausted in water softening operation are regenerated with acid solution at stoichiometric consumption of reagent by passing regeneration solution first through sulfonic cationite and then through carboxyl cationite. Working capacity of H-filter cationites is further increased by treating carboxyl cationite with acid spent H-filter- regeneration solution from previous regeneration operation before acid regeneration of carboxyl cationite filter. Invention allows sodium ion level in desalted water to be reduced by 80 times and alkalinity in softened water to be stabilized and reduced to values 0.29-0.36 mg- equ/cu.dm. Working capacity of cationites increases by 1.7-3.3 times resulting in 1.4-3.7-fold increase of summarily produced desalted and softened water. EFFECT: essentially increased water treatment efficiency. 2 cl, 1 dwg, 1 tbl, 3 ex