Desalination Post-treatment: Neutralization / Remineralization for Drinking water
Why should desalinated water be remineralized?
Reverse Omosis is not a selective ion removal process. After the common 2-pass RO process for Boron Removal, delisalinated water is poor in minerals.
Low mineralized water have few adverse effects:
- High corrosion potential
The WHO recommends 10 mg/L of Magnesium and 30 mg/L of Calcium for drinking water.
Double-pass SWRO system designed for enhanced Boron removal for dinrking water have a very low mineralization, about 5 to 10 mg/L of Na and 10 to 20 mg/L of Cl. Other ions are below 0.5 mg/L.
Four solutions are widely used to remineralize desalinated water:
Water Quality for drinking and Irrigation water: