APPARATUS AND METHOD FOR TREATING WATER

PURPOSE: A water-treatment apparatus and a water treatment method are provided to rapidly and accurately confirm a point of time for regenerating an ion-exchange resin. CONSTITUTION: A water-treatment apparatus(100) comprises a housing(110) in which a space is formed; a waste-water supply pipe(120); an ion-exchange resin(130); a waste-water discharge pipe(140); and a volume measuring part(150). The waste-water supply pipe supplies waste water to the space inside the housing through one side of the housing. The ion-exchange resin is located inside the space in the housing and removes treatment object ions from the waste water using an ion-exchanging method. The waste-water discharge pipe discharges the waste-water from which the treatment object ion is removed through another side of the housing. The volume measuring part measures a volume change of the ion-exchange resin and comprises a plate(152). A through-hole is formed in the plate for movement of the waste-water. When a value of the volume reaches a predetermined volume value, a regenerating material is injected into the space in the housing for the regeneration of the ion-exchange resin. [Reference numerals] (AA) Introduction; (BB) Discharging; (h) Through hole(h);