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Demineralised water is purified water from which most salts (minerals) have been removed. As a result, demineralised water does lose its buffering capacity, so the pH of demineralised water drops when it comes into contact with air, among other things. The advantage is that the conductivity of demineralised water and alkalinity decreases, and there is no longer any hardness (limescale) present. The main difference between osmosis water and demineralised water is that the conductivity of demineralised water is lower than that of osmosis water.
Demineralised water is produced utilising a demineralised water system. Demineralised water is so pure that minerals such as salt and lime do not enter the techniques and settle.
Osmosis water is produced by a Reversed Osmosis installation, while demineralized water is produced using flow-through resin (anions/cations). The latter is regenerated in time so that the quality of the demineralised water is always “improved”. The conductivity of microsemes in demineralized water is less than 2μS (microsiemas), the conductivity of microsiemas in osmosis water, on the other hand, is between 15-30 microsiemas, depending on the water quality. In short, the conductivity of demineralized water is lower than that of osmosis water.
Demineralized water is produced in three ways:
Demineralization must take place in different phases in order to obtain the right quality of demineralised water. The use of membrane filtration has the advantage that in general no chemicals are needed to produce demineralised water (if necessary for cleaning at the most). The downside is the amount of (electrical) energy required for the process.
Grünbeck supplies demineralised water installations from a very small 125l/hour up to installations of >400m3/hour. Grünbeck’s installation is very compact; 140x40x50 cm and the conductivity of the demineralised water <9 mS/cm is perfect.
A demineralized water device can be expanded with a pressure boosting installation, a softening installation, an ultrafiltration unit, an electro-deinosator and UV disinfection. This way you get demi water, i.e. water that does not contain minerals, specialized for your process.
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The knowledge article on demineralized water systems is also available in Dutch.
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