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US 12,528,050 B2Granted
Biocide composition and method
AssigneesJusteq, LLC, Acculab Co., Ltd.
InventorsSang Hea Shim, Chung Soo Kim
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to biocide compositions, formulations and methods for using formulations. In particular the present disclosure relates to biocide compositions and their use in treating reverse osmosis membranes.
Claims17
A method of maintaining a reverse osmosis system comprising
- a. preparing a stabilized hypochlorous acid solution comprising a chlorine source selected from the group consisting of an alkali metal hypochlorite, an alkaline earth metal hypochlorite or chlorine gas and a stabilizer selected from the group consisting of urea, thiourea, creatinine, mono or di-ethanolamine, organic sulfonamide, biuret, sulfamic acid, organic sulfamate, and melamine;
- and
- b. applying the stabilized hypochlorous acid solution formed from step (a) to a reverse osmosis membrane in seawater comprising from about 0.1 wt % to about 15 wt % of a water soluble bromide ion source selected from the group consisting of sodium bromide, potassium bromide, lithium bromide, chlorine bromide, and bromine to provide a biocide having a total halogen residual of from about 0.1 ppm to about 5 ppm in the seawater,
- wherein the method is carried out for at least about 30 days of continuous exposure to the biocide.
1 more element
A method of cleaning a semi-permeable membrane comprising
- a. preparing a stabilized hypochlorous acid solution comprising a chlorine source selected from the group consisting of an alkali metal hypochlorite, an alkaline earth metal hypochlorite or chlorine gas and a stabilizer selected from the group consisting of urea, thiourea, creatinine, mono or di-ethanolamine, organic sulfonamide, biuret, sulfamic acid, organic sulfamate, and melamine;
- and
- b. applying the stabilized hypochlorous acid solution formed from step (a) to the semi-permeable membrane in seawater comprising from about 0.5 wt % to about 15 wt % of a water soluble bromide ion source selected from the group consisting of sodium bromide, potassium bromide, lithium bromide, chlorine bromide, and bromine to provide a biocide having a total halogen residual of from about 0.1 ppm to about 5 ppm in the seawater,
- wherein the method is carried out for at least about 30 days of continuous exposure to the biocide.
1 more element
A method of defouling a semi-permeable membrane comprising
- a. preparing a stabilized hypochlorous acid solution comprising a chlorine source selected from the group consisting of an alkali metal hypochlorite, an alkaline earth metal hypochlorite or chlorine gas and a stabilizer selected from the group consisting of urea, thiourea, creatinine, mono or di-ethanolamine, organic sulfonamide, biuret, sulfamic acid, organic sulfamate, and melamine;
- and
- b. applying the stabilized hypochlorous acid solution formed from step (a) to the semi-permeable membrane in seawater comprising from about 0.5 wt % to about 15 wt % of a water soluble bromide ion source selected from the group consisting of sodium bromide, potassium bromide, lithium bromide, chlorine bromide, and bromine to provide a biocide having a total halogen residual of from about 0.1 ppm to about 5 ppm in the seawater,
- wherein the method is carried out for at least about 30 days of continuous exposure to the biocide.
1 more element
Dependencies are inferred from the claim text.