High recovery reverse osmosis process and apparatus
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United States of America Patent
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Apr 7, 2009
Grant Date -
Feb 15, 2007
app pub date -
Jan 27, 2006
filing date -
Apr 14, 2003
priority date (Note) -
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Abstract
Processes and apparatus are disclosed for producing clear reverse osmosis retentates having silica concentrations which are substantially supersaturated in silica from feedwaters having silica concentrations, without substantial formation of alkali-soluble scale having substantial silica content in the associated reverse osmosis apparatus, by adjusting the pH of such feedwaters to an acidic pH range prior to reverse osmosis in accordance with this invention. Also disclosed are related processes and apparatus for periodically removing minor amounts of alkali-soluble scale having substantial silica content from the apparatus.
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