Control of sulfides in aqueous systems
Solid peroxygens may be compressed into shaped forms with or without additives to regulate the dissolving rate of the forms. Use of such peroxygen forms provides a simple and inexpensive method to dispense active oxygen and an alkali into a solution over a predetermined time to oxidize sulfides to sulfates and thus to reduce the chemical oxygen demand. Sodium carbonate peroxide and sodium perborate are two commercial peroxygen compounds particularly useful for this application as they provide both the active oxygen to oxidize the sulfide, and the alkalinity required to raise the pH of the solution to pH 8 or greater, thus preventing the formation of elemental sulfur. In addition, the two compounds are compatible with additives, such as carboxymethylcellulose and methylcellulose, which are useful in regulating the dissolution rate, as well as soda ash, which can be used to provide additional alkalinity.
Type: Grant
Filed: Oct 5, 1981
Date of Patent: Apr 5, 1983
Inventor: William H. Kibbel, Jr. (Pennington, NJ)
Application Number: 6/308,625
International Classification: A01N 0000;
