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Water for the paint shop

With the development of technology, there is a growing demand for high-quality paint coatings on metal products for anti-corrosion, decorative and environmental reasons.

Water treatment plants in paint shops

A water treatment plant is an essential part of the modern paint shop. Demineralized water is used at all stages, from workpiece preparation and cleaning, through painting to drying. In order to maintain the appropriate quality of the paint coating, it is necessary to use high-quality water.

Paint shop washers can be divided into two basic types: spray and immersion washers. Both types require using water of appropriate quality. Raw mains water contains such compounds as chlorine, calcium, magnesium, phosphorus, sulphates. They undergo various chemical reactions. In addition, the quality of mains water may change during the year, e.g. due to a temperature change.

Water treatment methods in paint shops

Until recently, two water treatment methods were used in paint shops. The first one, which is currently being abandoned, consists in demineralizing using ion (cation-anion) exchange beds. This method allowed to obtain good quality water but entailed significant operational problems. Acid and bases were used to regenerate the beds. The ensuing problem was sewage disposal, which must not be discharged into the sewage system. In addition, this type of equipment required constant supervision by maintenance personnel (refill acid, bases, washwater removal).

Reverse osmosis water for the paint shop

Currently, reverse osmosis stations are used in all new paint shops. Technological progress has allowed for a significant reduction in the costs of installing such stations. Water treatment plants based on the reverse osmosis technology are fully automatic and do not require constant supervision. Waste water from the filtration process can be discharged into the sewer. Modern systems require only 20-25% water rejection.