Green softener

Acid softener

A method of softening water by ion exchanger in order to prevent the forming of lime-scale by exchanging the positively charged Calcium and Magnesium ions with Hydrogen ions together with improving the alkalinity of the water.

In the green softener, the ions are exchanged by attaching them to a weak cationic resin (as opposed to the strong cationic resin in the salt softener).

Uses:

Cooling towers, as a preliminary process to RO and steam boilers.
Advantages of the green softener:

• The green softener is refreshed with Sulphuric acid H₂SO₄
• The acid volume is very small.
• As part of the resin refreshment Calcium hardness is removed from the resin into the water as CaSOo₄ 2H₂Owhich complies with applicable standards, does not sink and insures clean sewage piping.
• The softener reduces the carbonates and the hardness with the same ratio of the carbonates.
• Corrosion does not occur because the fall in PHis a result of a weak acid, carbonate acid, H₂CO₃, formingand immediately breaking down into water H₂O and CO₂ gas at the intake of the cooling tower , the gas immediately evaporates (and since there are no carbonates no lime-scale is formed).
• Alkalinity reduction - the cooling tower water maintain PH in the range of 7.7-8.2 without additions and adjustments.
• Lime-scale does not occur because lime-scale(CaCO₃)only forms in PH8.3 or higher.
• There is no need for additional chemicals (anti-scalants).
• This system uses water very sparingly.

A comparison table of water treatments:

 

RO treatment	Salt softener	Green softener	Tap water	Parameter
4	4-7	60	255	Residual hardness in  ppm
180	180	10-30	180	Alkalinity in ppm
	700-1000	520-820	700-1000	Conductivit