Method for operating a water softening plant and water softening plant

Abstract

The invention relates to a method for operating a water softening plant (1), wherein the amount of regeneration salt used in each regeneration cycle (105) is determined. A storage container (7) containing solid regeneration salt (8) is placed on a weighing device (14). In a regeneration cycle (105), it is carried out in any order: at least one regeneration agent solution (9) is extracted from the storage container (7), the regeneration agent solution is supplied to the softening device (21), and the storage container ( 7) is replenished with water at least once, so that the liquid level (11) remains unchanged overall. The mass loss that occurs overall through the regeneration cycle (105) due to the density difference between the extracted regenerant solution (9) and the replenished water is determined using a weighing device (14) and corresponds to the mass loss during the regeneration cycle (105) The amount of salt used in M RZ . In particular it can be used as the amount of salt ΔM extracted in each extraction cycle (101, 102; 301) in this regeneration cycle (105) EZ and determine the amount of salt M extracted in a regeneration cycle (105) RZ . The invention can simply and accurately determine the salt consumption of the regeneration cycle.

Description

technical field [0001] The invention relates to a method for operating a water softening plant and a water softening plant. Background technique [0002] This method is known from DE 10 2013 011 751 A1. [0003] In households or also in technical installations, it is often desirable or necessary to use demineralized water for various reasons. Water softening systems based on ion exchange resins are usually used for this purpose. The ion exchanger absorbs hardeners (calcium or magnesium ions) and releases ions that have no hardening effect (mostly sodium ions) for this purpose. [0004] The amount of hardener that the ion exchange resin can bind here is limited (the ion exchange resin is exhausted) and must therefore be periodically regenerated. Ion exchange resins are usually treated with brine for regeneration. [0005] Regeneration of ion exchange resins with brine introduces costs in water softening. The amount of salt used for regeneration is too large so that a par...

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Problems solved by technology

Difficult to use conductivity sensors in concentrated saline solutions due to corrosion; correspondingly resistant electrode materials are very expensive

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