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Anti-scalants

Scaling of a reverse osmosis membrane may occur when sparingly soluble salts are concentrated within the element beyond their solubility limit. In a RO system the most common sparingly soluble salts encountered are CaSO4, CaCO3 and silica. Other salts (especially in sea water) creating a potential scaling problem are CaF2, BaSO4 and SrSO4. Anti-scalants (scale inhibitors) are used to preventing the fouling of RO membrane elements due to the formation of scale. The anti-scalants inhibit the nucleation step of salts in the concentrate of RO system and so delay crystal and precipitate occurrence.

 

Foulants Antiscalants
Inorganic scales Silica scale Colloid foulant Organic foulant Biologic foulant
CaCO3, Ca/Ba/Sr SO4, Metal oxide Colloidal silica
Reactive silica
Colloidal silt
Particulate
Humic acid
Lignin, oil
Bacteria, mold, fungi, yeasts
MAS 200
       
MAS 400
       
MAS 500
   
MAS 800
       

 

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