Certain applications such as high pressure boiler feed require pure water, free of any contaminants. Town’s water supplies contain contaminants such as calcium, magnesium, sodium, chlorides and sulphates. Deionisation (or demineralisation) plants employ ion exchange resins to remove these contaminants.

A twin bed deioniser (demineraliser) uses cation and anion resin, contained in separate vessels to remove ionic contaminants. In the deionisation process cation resin is contained in the first vessel to come in to contact with the feed water. The cation resin is operated in the hydrogen form and positively charged cations such as sodium (Na+), calcium (Ca++) and magnesium (Mg++) are removed by the resin and replaced with hydrogen ions (H+). Read more...

Products

EWS (UK) Ltd also offers exchange cylinders containing mixed bed resin which can be used, typically on smaller systems, to prevent the need for more sophisticated, regenerable mixed bed demineralisers. These mixed bed cylinders are also regularly used post reverse osmosis plants, negating the need for acid and caustic regenerant chemicals on a site.

EWS (UK) Ltd offer a range of standard co-current and counter current, twin bed deionisers. The smaller sizes use proven multiport valve technology for control of service and regeneration functions. Larger plants use individual diaphragm valves mounted within pipe work manifolds for control of service and regeneration functions.

We also supply bespoke deioniser systems for more specialist applications such as water recovery within the metal finishing industry. These systems regularly employ a variety of resins to best suit the operating conditions and have additional design features such as the facility for in situ cleaning of resins.

All plants are supplied with conductivity or resistance meters for indication of treated water quality and control of regeneration initiation and larger plants are supplied with PLC’s for overall plant control and human machine interface (HMI) for indication of plant running condition and operator input.

Regenerant handling systems including semi-bulk and bulk holding tanks are available, although smaller plants are generally designed to regenerate directly from carboys or other suitable containers. We also offer a wide variety of fume scrubbing systems, including resin type scrubbers with colour change resin for operation with day tanks or other small containers.

For more information please download our Gemini Range datasheet or contact the sales team by email to sales@reverseosmosis.co.uk.