Water treatment compositions
AssigneeThe Procter & Gamble Company
InventorsPhilip Frank Souter, Colin Ure
Life of this patent
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Abstract
Compositions, methods and kits for purifying, clarifying nutrifying and any combination thereof, contaminated drinking water, which contain a primary coagulant material and a bridging flocculent material. The levels and ratios of coagulant to flocculent preferably fall within certain ranges. Highly preferred compositions also contain one or more of a cationic coagulant aid, especially chitosan, a microbiocidal disinfectant, a water-soluble alkali, a water-insoluble silicate, and a food additive or nutrient source.
Claims19
A composition for purifying and clarifying contaminated drinking water, said composition comprising:
- (i) a primary coagulant selected from the group consisting of water-soluble, multivalent inorganic salts and mixtures thereof;
- (ii) a bridging flocculant selected from the group consisting of water-soluble and water-dispersible anionic and nonionic polymers having a weight average molecular weight of at least about 2,000,000, and mixtures thereof;
- (iii) a coagulant aid selected from the group consisting of water-soluble and water-dispersible cationic polymers having a weight average molecular weight of less than about 1,500,000, and mixtures thereof;
- and optionally one or more of
- (iv) a microbiocidal disinfectant;
- (v) a water-soluble alkali;
- (vi) a water-insoluble silicate selected from the group consisting of clays, zeolites and mixtures thereof;
- (vii) a food additive or nutrient source;
- and
- wherein the weight ratio of said primary coagulant to said bridging floccularit is from about 10:1 to about 100:1.
A composition according to said primary coagulant is from about 10% to about 99%, by weight.
Dependencies are inferred from the claim text.