Disinfection method for water and wastewater
AssigneeEvonik Operations GmbH
InventorsPhilip Block, Weidong An, Angela Thompson, Coryn Mittiga
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Abstract
Provided herein are methods and compositions for water disinfection. The methods and compositions, which can include a peracid and a source of copper ions, are useful for treatment of water contaminated with recalcitrant microbes.
Claims20
A method of reducing the concentration of microorganisms in water by the combined effect of one or more peracids and one or more water-soluble copper-containing salts, wherein the method consists of:
- a) adding the one or more peracids (or an aqueous solution of the one or more peracids) and the one or more water-soluble copper-containing salts to the water to a final concentration of 0.1 ppm to 20 ppm peracid and 0.01 to 10 ppm copper ions;
- wherein:
- i) the water is selected from the group consisting of:
- sewage, industrial wastewater, municipal wastewater, combined sewer overflow, process water, rain water, flood water, and storm runoff water;
- and
- ii) the one or more peracids and the one or more water-soluble copper-containing salts are added together in a single solution;
- b) maintaining contact between the water, the one or more peracids and the copper ions for a time sufficient to reduce the concentration of microorganisms in the water.
A method of reducing the concentration of microorganisms in water by the combined effect of one or more peracids and one or more water-soluble copper-containing salts, wherein the method consists of:
- a) adding the one or more peracids and the one or more water-soluble copper-containing salts to the water to a final concentration of 0.5 ppm to 50 ppm peracid and a concentration of copper ions effective to increase antimicrobial activity of the peracid;
- wherein:
- i) the water is selected from the group consisting of:
- sewage, industrial wastewater, municipal wastewater, combined sewer overflow, process water, rain water, flood water, and storm runoff water;
- and
- ii) the one or more peracids and the one or more water-soluble copper-containing salts are added together in a single solution;
- b) maintaining contact between the water, the one or more peracids and the copper ions for a time sufficient to reduce the concentration of microorganisms in the water.
Dependencies are inferred from the claim text.