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ABSTRACT
Sea-water was pretreated before desalination to remove suspended colloidal materials capable of fouling the reverse osmosis membrane. A simple model for sea water was used in which silica and iron represented the inorganic colloids, and casein the organic colloids (namely the sea-water proteins).
The suspended inorganic colloidal materials were precipitated by the coagulant property of hydrolyzed aluminum ions from an Al/Pt electrochemical cell.
Titrimetric and spectrophotometry methods were used to analyze the concentration of the remaining ions after pretreatment. The silica content was reduced from lOOppm to 7ppm in the galvanic cell, and to 3.5ppm when an outside current was used. The corresponding reduction of iron concentration was from 2ppm to 0.05ppm.
Notes
*patent application 1982