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When the process requires reduced levels of salts in the industrial water supply it is advisable to further purify the feed water by demineralisation using resin beds or reverse osmosis.
Demineralisation by reverse osmosis

This membrane technique makes possible the reduction of minerals in the water. It has the advantage of not using regenerating products (acid and bases). BABCOCK WANSON have developed a whole range of osmosis equipment, which makes it possible to meet and optimise the needs of industry.

Reverse osmosis provides a simple solution of energy saving by the important reduction of the volume of purges necessary for the functioning of the steam generators. Purges of boilers fed with soft water generally range from 10 to 25% and sometimes more, are reduced to 1%.
Reverse osmosis thus allows improving the energy ratio of the boiler with a return on investment often less than 18 months.
Key characteristics of the EDI process:
water demineralisation by reverse osmosis
  • water produced with a conductivity of between 0,055 - 0,5 µS/cm and with a silica content of less than 5 ppb,
  • can provide a continuous flow of purified water with a water flush rate as low as 5%,
  • No requirement for expensive regeneration chemicals with the incumbent saving in cost and improvements in the environment and operator safety,
  • simple to install and operate with low supervision cost.

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