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US 4,364,835 AGranted
Sulfite destruction of direct acting mutagens in drinking water
AssigneeRegents of the University of Minnesota
InventorAlbert M. Cheh
Life of this patent
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Abstract
A method of reducing the activity of non-volatile mutagens, in chlorinated water, such as chlorinated drinking water and municipal and industrial waste water, by sulfite treatment. The chlorinated water is treated with a stoichiometric excess of sulfur dioxide or soluble sulfite or bisulfite salt sufficient to dechlorinate the water and at least partially destroy the mutagens present.
Claims17
The method of reducing the activity of non-volatile mutagens in chlorinated water, which method comprises:
- (A) determining the residual chlorine in the water,
- (B) adding sulfite to the water in amount in excess of that sufficient to eliminate the residual chlorine,
- (C) uniformly and thoroughly admixing said sulfite and water to dechlorinate the water and at least partially destroy the mutagens therein.
The method of reducing the activity of non-volatile direct-acting mutagens in chlorinated water, which method comprises:
- (A) determining the residual chlorine in the water,
- (B) adding sulfite to the water in the form selected from the group consisting of water soluble alkali metal sulfite and bisulfite and gaseous sulfur dioxide and in amount in excess of that sufficient to eliminate the residual chlorine of about 1.5 to 10 times the stoichiometric ratio of sulfite to chlorine,
- (C) uniformly and thoroughly admixing said sulfite and water at a temperature between about 0.degree. to 30.degree. C. at pH between 5 and 12 for about 15 minutes to 6 hours sufficient to dechlorinate the water and at least partially destroy the mutagens therein.
Dependencies are inferred from the claim text.