Process for the treatment of water solution by ion exchange

Claim 1

In a process for the treatment of water including cyclic operation of an ion exchange mixed bed system wherein a mixture of anion and cation exchange material through which untreated water is arranged to flow in a treatment container is cyclically fed in charges from the bottom of the treatment container to a back-rinsing and separation column, the volume of the said charges is set in a measuring column connected to the output of the treatment container and the input of the back-rinsing and separation column, the mixed anion and cation exchange material is separated in the said back-rinsing and separation column such that an anion exchange mass is disposed in a region above a region containing a cation exchange mass with a further intermediate region containing a mixture of anion and cation exchange material between the upper and lower region, anion and cation exchange charges are separately drawn off from the upper and lower regions in the back rinsing and separation column, the charges being fed into separate regeneration and wash columns and thence returned into the treatment container the improvement which consists in that chemicals capable of assisting in the separation of cation and anion exchange masses are admixed and introduced into the system ejector by means of an disposed between the treatment container and the measuring column.