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Softening
Hardness is often an issue in several industrial processes because of the risk of precipitates and inorganic fouling associated with it.
Removal of hardness-associated ions calcium and magnesium is in particular extremely important in the following industrial applications:
- Textile industry
- Beverages and soft drinks
- Food preparation
In the softening process, hardness-producing elements of calcium and magnesium are removed and replaced with sodium by a Strong Acid cation resin.
If water containing calcium or magnesium is passed through an ion-exchanger, these metals are taken-up by the resin which simultaneously gives out sodium in exchange.
After the overall capacity of the bed to retain hardness has been exhausted, the unit is removed from service and backwashed with a solution of sodium chloride. This removes the calcium and magnesium in the form of their soluble chlorides and at the same time restores the resin in the form of original sodium conditions.
Bono Artes Via Irno, 221 I-84135 Salerno (Sa) Italy Phone +39 089 271717 Fax +39 089 271259 VAT n. 03065820650
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