METHOD OF WATER TREATMENT Russian patent published in 2007 - IPC C02F1/42 C02F1/28 B01J49/02 C02F103/04 

FIELD: water purification and preparation by means of filtering modules containing ion-exchange resins for softening of water.

SUBSTANCE: proposed method consists in passing water to be cleaned through layer of floating inert material and ion-exchange resin in downward direction and regeneration of ion-exchange resin by pressing its layer by liquid medium flow in upward direction, passing of regenerating solution, gravity sedimentation of resin and washing-off residues of regenerating solution. Filtration is performed through at least two filters mounted in succession; charge of ion-exchange resin is so selected that volume of resin in first filter is no more than 40% of total amount of resin used for cleaning; at regeneration, resin is so pressed that it passes through stage of formation of fluidized layer. In pressing the resin during raising it, rate of flow in first filter shall be below rate of flow required for piston-like raising of resin by at least 25%. Liquid is delivered to first filter in pulse mode or raising of resin is carried out simultaneously with bubbling of gas through it.

EFFECT: enhanced efficiency; reduced consumption of salt for regeneration and water.

6 cl, 1 tbl, 4 ex