Preparation of non corrosive aluminum sulfate
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United States of America Patent
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Issued Date -
Mar 18, 2004
app pub date -
Sep 16, 2002
filing date -
Sep 16, 2002
priority date (Note) -
Abandoned
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Abstract
The addition of an alkali, preferably hydrated lime to aluminum sulfate raises the pH, increases that cationic charge, improves performance as compared to aluminum sulfate alone and causes the aluminum sulfate to be non-corrosive to skin and metal. The addition of a minor quantity of phosphoric acid also provides added stability to the product. The advantages of this modified alum include improved floc performance over standard alum and other polyaluminum chloride (PACl) products. Therefore, the product of the invention (by varying the percent of lime to alum) has the potential to compete with polyaluminum chloride products using alum-based products. These polyaluminum sulfate products do not decrease the pH of treated water, as much as alum and performs more like a PACl product. The polyaluminum sulfate (PAS), like the PACl works well in low alkalinity waters. The PAS products have been found to remove total organic carbon and lower turbidity very efficiently.
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