Water treatment
AssigneeBwa Water Additives UK Limited
InventorJeffrey Frank Kramer
Life of this patent
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Abstract
The present invention relates to water treatment. In one embodiment there is provided a method of treating an aqueous system to inhibit growth of one or more micro-organisms therein and/or to reduce the number of live micro-organisms therein. The method comprises adding treatment agents to said aqueous system and wherein said treatment agents comprise: (a) a phosphonium compound; and (b) a halogen oxide compound.
Claims17
A method of treating an aqueous system to inhibit growth of Desulfovibrio vulgaris therein and/or to reduce the number of live Desulfovibrio vulgaris therein wherein the method comprises adding treatment agents to said aqueous system which has a total dissolved solids (TDS) of 10,000 mg l−1 or greater and wherein said treatment agents comprise:
- (a) a phosphonium compound consisting of tri n-butyl n-tetradecyl phosphonium chloride (TTPC);
- and
- (b) a halogen oxide compound consisting of chlorine dioxide;
- wherein the treatment agents show greater performance of inhibiting growth or reducing the number of Desulfovibrio vulgaris than the sum of said treatment agents' individual performance;
- and
- wherein the method comprises adding said chlorine dioxide to said aqueous system such that it is present in an active residual amount of at least 0.05 parts per million (ppm);
- and
- wherein the method comprises adding the phosphonium compound (a) to said aqueous system in an amount of not more than 50 parts per million;
- and
- wherein the method comprises adding the phosphonium compound (a) and the halogen oxide compound (b) to an aqueous system in a weight ratio, expressed as active compound, of phosphonium compound:halogen oxide compound of from 1.0:25.0 to 50.0:1.0.
A method of inhibiting the growth of Desulfovibrio vulgaris and Enterobacter aerogenes in an aqueous media, wherein the method comprises adding treatment agents to an aqueous media comprising dissolved solids such that it has a total dissolved solids (TDS) of 10,000 mg l−1 to 30,000 mg l−1 and wherein said treatment agents comprise:
- (a) a phosphonium compound consisting of tri n-butyl n-tetradecyl phosphonium chloride (TTPC);
- and
- (b) a halogen oxide compound consisting of chlorine dioxide;
- wherein the treatment agents are added to the aqueous media in amounts configured to inhibit the growth of Desulfovibrio vulgaris and Enterobacter aerogenes in the aqueous media;
- wherein the treatment agents show greater performance of inhibiting growth than the sum of said treatment agents' individual performance;
- and
- wherein the method comprises adding said chlorine dioxide to said aqueous media such that it is present in an active residual amount of at least 0.05 parts per million (ppm);
- and
- wherein the method comprises adding the phosphonium compound (a) to said aqueous media in an amount of not more than 50 ppm;
- and
- wherein the method comprises adding the phosphonium compound and the halogen oxide compound to an aqueous media in a weight ratio, expressed as active compound, of phosphonium compound:halogen oxide compound of from 12.5:1.0 to 25:1.0.
A method of treating an aqueous system to inhibit growth of Desulfovibrio vulgaris and Enterobacter aerogenes micro-organisms therein and/or to reduce the number of live Desulfovibrio vulgaris and Enterobacter aerogenes micro-organisms therein, wherein the method comprises adding treatment agents to said aqueous system which has a total dissolved solids (TDS) of 10,000 mg l−1 or greater and which contains oil and wherein said treatment agents comprise:
- (i) a phosphonium compound consisting of tri n-butyl n-tetradecyl phosphonium chloride (TTPC);
- and
- (ii) a halogen oxide compound consisting of chlorine dioxide;
- wherein the treatment agents show greater performance of inhibiting growth or reducing the number of micro-organisms than the sum of said treatment agents' individual performance;
- and
- wherein the method comprises adding said chlorine dioxide to said aqueous system such that it is present in an active residual amount of at least 0.05 parts per million (ppm);
- and
- wherein the method comprises adding the phosphonium compound (a) to said aqueous system in an amount of not more than 50 ppm;
- and
- wherein the method comprises adding the phosphonium compound and the halogen oxide compound to an aqueous system in a weight ratio, expressed as active compound, of phosphonium compound:halogen oxide compound of from 1.0:25.0 to 50.0:1.0.
A method comprising:
- adding treatment agents to an aqueous system, the aqueous system comprising dissolved solids such that it has a total dissolved solids (TDS) of 10,000 mg l−1 to 250,000 mg l−1, and containing Desulfovibrio vulgaris and Enterobacter aerogenes, the treatment agents comprising a combination of:
- (a) a phosphonium compound consisting of tri n-butyl n-tetradecyl phosphonium chloride (TTPC);
- and
- (b) a halogen oxide compound consisting of chlorine dioxide;
- wherein the combination of TTPC and halogen oxide compound are added to the aqueous system in amounts configured to reduce the number of live Desulfovibrio vulgaris and Enterobacter aerogenes in the aqueous system;
- wherein the combination shows greater performance of reducing the number of live Desulfovibrio vulgaris and Enterobacter aerogenes than the sum of said treatment agents' individual performance;
- wherein the method comprises adding said chlorine dioxide to said aqueous media such that it is present in an active residual amount of at least 0.05 parts per million (ppm);
- wherein the method comprises adding the phosphonium compound (a) to said aqueous system in an amount of not more than 50 ppm;
- and
- wherein the method comprises adding the phosphonium compound and the halogen oxide compound to an aqueous system in a weight ratio, expressed as active compound, of phosphonium compound:halogen oxide compound of from 1.0:25.0 to 50.0:1.0.
Dependencies are inferred from the claim text.