Dm Plant

Sewage & Waste Water Treatment

Salinity (excessive presence of Inorganic salts) of water interferes the performance of various systems, as presence of hardness enhances the scaling tendency of water while presence of EMA & alkalinity leads towards corrosion and foaming – carry over during different process. Hence saline water leads to poor performance and severe damages of different equipments, piping, utensils & gadgets etc.

Demineralisation is the process of removing mineral salts from water by using the ion exchange process. With most natural water sources it is possible to use Demineralisation and produce water of a higher quality than conventional distillation.

When this stream of saline water is passed through the bed of Ion exchange media present with Cation column (Hydrogen ion rich) - a reversible ion exchange reaction takes place and all the available cations (Ca⁺⁺, Mg⁺⁺, Na⁺ etc.) get replaced with H+ ions, consequently water gets acidic in presence of different mineral acids formed during the reaction. These could be explained as following:

CaCl₂ + 2 ReH⁺            Re₂Ca + 2 HCl
MgSO₄ + 2 ReH⁺        Re₂Mg + 2 H₂SO₄          Reactions under Cation column.
NaHCO₃ + ReH⁺⁺        ReNa + H₂CO₃

Removal / reduction of Carbonic Acid load – As Carbonic acid is an unstable compound and can be broken into CO₂ & H₂O, as per following:

H₂CO₃         CO₂ + H₂O