Composition and method for reducing chemical oxygen demand in water
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United States of America Patent
Stats
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Aug 11, 2009
Grant Date -
Dec 28, 2006
app pub date -
Sep 14, 2005
filing date -
Jun 22, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and composition for reducing chemical oxygen demand is presented. The composition includes a persulfate donor, a transition metal catalyst in contact with the persulfate donor, and a cationic electrolyte. When the composition is contacted by water, the transition metal catalyst reacts with persulfate and reduces the persulfate concentration in the water. The composition allows the use of persulfate, which is known to cause irritation to users of aquatic facilities (e.g., pools, spas) that come in contact with it. As the persulfate concentration is reduced rapidly in the water by the catalyzed reaction, the persulfate-containing product may be applied while the aquatic facilities are being used. A free halogen donor may be incorporated into the composition. The composition may be in the form of powder, granules (coated or uncoated), or agglomerate. The cationic electrolyte facilitates the removal of the catalyst from the water.
First Claim
Other Claims data not available
