Biocidal compositions for treating water

Details Biocidal compositions for treating water Biocidal compositions for treating water

C - Chemistry, Metallurgy

02

F

C02F 1/50 (2006.01) A01N 59/16 (2006.01) A01N 59/20 (2006.01)

Patent

CA 2319342

The present invention is directed to a biocidal water treatment composition, water treatment apparatus, and method of treating water to reduce levels of pathogens. The composition contains sources of copper, zinc, and silver metal ions within a cross-linked polymer matrix. Examples of these ion sources include copper sulfate, zinc sulfate, and silver nitrate. An example of the cross-linked polymer matrix is cross-linked chitosan, which also serves to clarify the water and release the metal ions over time. The product is easy to manufacture, and allows the use of decreased halogen sanitizer, as well as decreased copper ion, thereby decreasing the likelihood of staining. The product simultaneously provides good bactericidal and algaecidal properties, despite low levels of copper ion and low chlorine levels.

L'invention concerne une composition biocide pour le traitement de l'eau, un appareil de traitement de l'eau, ainsi qu'un procédé de traitement de l'eau en vue de réduire la teneur en agents pathogènes. La composition renferme des sources d'ions métaux, à savoir, cuivre, zinc et argent, dans une matrice polymère réticulée. On mentionne comme exemples de ces sources d'ions, le sulfate de cuivre, le sulfate de zinc et le nitrate d'argent. Un exemple de matrice polymère réticulée est le chitosane réticulé qui sert également à clarifier l'eau tout en libérant à la longue les ions métaux. Le produit est facile à fabriquer et permet d'utiliser moins de stérilisant halogéné et moins d'ions cuivre, réduisant ainsi la probabilité de coloration. Le produit présente de bonnes propriétés à la fois bactéricides et algicides, en dépit de faibles teneurs en ions cuivre et en chlore.

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