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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. Apart from a demineralisation by reverse reverse osmosis, another solution is a demineralisation by resin exchange: “HRW process”.

While being based on the process of counter-current regeneration, BABCOCK WANSON has developed the "HRW" process which removes salts (and silica) by the provision of cationic and anionic resins (primary chain) and/or from mixed beds (final polishing).

The counter-current regeneration process presents many advantages in term of regenerating reagents consumption and quality of water produced :

water demineralisation by resine exchange
  • quality of the water produced with low conductivity and stable in time ;
  • no suspension phase ;
  • obtaining a water of constant quality over the duration of the cycle ;
  • reduction in the volume of service water and thus in the volume of waste water ;
  • reduction of the duration of regeneration and the quantity of reagents (-30 to 40%) ;
  • reduction of the size of the installations.

demineralisation by reverse osmosis

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