METHOD OF WATER SOFTENING Russian patent published in 2014 - IPC C02F5/02 C02F1/66 

FIELD: chemistry.

SUBSTANCE: method includes mechanical activation by passing a water flow through a membrane system with holes with d diameter not larger than 1 mm with a ratio of a flow section to 10%, with pressure variation from 0.05 to 0.5 MPa, water alkalisation with a water ammonia solution in an amount of 0.003÷0.05 wt % and separation of an insoluble sediment from the processed water. The length of hole channel L is selected by condition L≥10d, where d is a diameter of one hole. Separation of the insoluble sediment from the processed water is performed in centrifuges of a setting type with pulsing or auger discharge of the sediment.

EFFECT: increased efficiency of the water softening process, reduction of energy consumption and reduction of concentration of an introduced alkalising solution.

3 cl, 1 tbl