RAW WATER HARDNESS DETERMINATION IN A WATER TREATMENT SYSTEM VIA THE CONDUCTIVITY OF THE SOFT OR BLENDED WATER

摘要

A method of operating a water treatment system (1), having- a softening device (4), in particular comprising an ion-exchange resin(7),- a conductivity sensor (9),- and electronic control device (13), and- an automatically adjustable blending device for mixing a blended waterstreamV(t)blend from a first, softened part-stream V(t)part1 soft and a second, raw-water-carrying part-stream V(t)part2raw,is characterised in thatthe conductivity LF soft of the softened water or the conductivity LF blend oftheblended water is determined experimentally,and in that the conductivity LF raw of the raw water and/or the total hardnessofthe raw water is derived from the experimentally determined conductivity LFsoftof the softened water or LF blend of the blended water.With the invention, inexpensive and permanently reliable control of a watertreatment system, in particular of the regeneration and blending, is possible.