Industrial Dm Plant By Global Aqua

Some of the applications like pharma, high pressure boilers, electronic industry etc. require superior quality than above, in such cases, the mixed bed unit ( MB ) is used to further polish the water. The MB unit consists of two types of resins, cation & anion in the same column. The resins are separated by water during regeneration and mixed with air for service cycle.
Water softener is commonly used process equipment for removing hardness in the raw water so as to make it usable for various applications like boiler feed, cooling tower make up, textile mills, laundries, AC plants, heat exchangers & for domestic use also.

The reaction of the units can be shown as under :

CaSO4 + R ( H ) = R ( Ca ) + H2SO4 --- Cation service cycle
H2SO4 + R ( OH ) = R ( SO4 ) + H2O --- Anion service cycle
R ( Ca ) + Hcl = R ( H ) + Cacl2 --- Cation regeneration
R ( SO4 ) + NaOH = R ( OH ) + Na2SO4 --- Anion regeneration

The water coming out of anion unit generally has following treated water quality :

Hardness: Nil
Conductivity: Less than 40 microsiemens
pH: 7.5 to 9.0
The induction of this unit should be justified by the savings of NaOH used for the anion resins.