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US 6,649,065 B2Granted
Bromine biocide removal
AssigneeSEH America, Inc.
InventorAllen R. Boyce
Life of this patent
Estimating the term…
Abstract
A system and method are provided which removes bromine biocide used in effluent process streams without the use of chemicals or complex mechanical systems. In particular, the system and method of the present invention remove bromine biocide by photodissociating the bromine, thereby forming innocuous salts. Ultraviolet energy may be used to provide the energy for photodissociation, in particular ultraviolet energy supplied by medium pressure Hg vapor lamps.
Claims34
A water purification system comprising:
- means for providing bromine biocide to a cooling tower effluent water stream;
- a single irradiation chamber consisting essentially of an ultraviolet radiation source providing radiation ranging in intensity from about 200 mWs/cm to 3,500 mWs/cm2 for treating said bromine biocide present in said effluent water stream in an amount ranging from about 0.2 to 5.0 ppm, thereby forming compounds which are less oxidative than said bromine biocide, said effluent water stream flowing through said irradiation chamber exhibiting a turbid appearance and the residual level of bromine biocide present in the irradiated effluent water stream exiting the irradiation chamber is less than or equal to 0.1 mg/l;
- a deionizer for removing hardness in the form of cations present in said irradiated water;
- and
- a separation system for removing suspended and dissolved solids from said deionized water;
- whereby said formation of compounds which are less oxidative than said bromine biocide protects said deionizer and said separation system from degradation by said bromine biocide.
3 more elements
A water purification method comprising:
- introducing bromine biocide into a cooling tower effluent water stream in an amount ranging from about 0.2 to 5.0 ppm;
- irradiating bromine biocide contained in said effluent water stream with radiation consisting essentially of ultraviolet radiation emitted from a single irradiation chamber ranging in intensity from about 200 mWs/cm2 to 3,500 mWs/cm2, said effluent water stream flowing through said irradiation chamber exhibiting a turbid appearance and the residual level of bromine biocide present in the irradiated effluent water stream exiting the irradiation chamber is less than or equal to 0.1 mg/l;
- allowing said irradiated bromine to react with cations contained in said effluent stream, thereby forming compounds which are less oxidative than said bromine biocide;
- removing ions from said effluent water stream following formation of said less oxidative compounds to merely soften the water;
- and
- separating suspended and dissolved solids from said softened water,
- whereby said formation of compounds which are less oxidative than said bromine biocide protects the apparatus used in said ion removal and separating steps from degradation by said bromine biocide.
4 more elements
A water purification system comprising:
- an irradiation means for treating bromine biocide present in a turbid effluent water stream in an amount ranging from about 0.2 to 5.0 ppm, thereby forming compounds which are less oxidative than said bromine biocide, wherein said irradiation means consists essentially of an irradiation chamber, an ultraviolet light source, an inlet for allowing untreated effluent water to enter said chamber and an outlet for allowing irradiated effluent water to exit said chamber, the residual level of bromine biocide present in the irradiated effluent stream exiting the irradiation means is less than or equal to 0.1 mg/l;
- a deionizer for removing hardness in the form of cations present in said irradiated water;
- and
- a separation system for removing suspended and dissolved solids from said deionized water;
- whereby said formation of compounds which are less oxidative than said bromine biocide protects said deionizer and said separation system from degradation by said bromine biocide.
2 more elements
A water purification system comprising:
- a single irradiation chamber consisting essentially of an ultraviolet radiation source for treating bromine biocide present in a turbid cooling tower effluent stream in an amount ranging from about 0.2 to 5.0 ppm, thereby forming compounds which are less oxidative than said bromine biocide, the residual level of bromine biocide present in the irradiated effluent water stream exiting the irradiation chamber is less than or equal to 0.1 mg/l;
- a deionizer for removing hardness in the form of cations present in said irradiated water;
- and
- a separation system for removing suspended and dissolved solids from said deionized water;
- whereby said formation of compounds which are less oxidative than said bromine biocide protects said deionizer and said separation system from degradation by said bromine biocide.
2 more elements
A water purification system comprising:
- means for providing bromine biocide to an effluent water stream;
- a single irradiation chamber for treating said bromine biocide present in said effluent water stream in an amount ranging from about 0.2 to 5.0 ppm, thereby forming compounds which are less oxidative than said bromine biocide, said irradiation chamber consisting essentially of an ultraviolet radiation source providing radiation ranging in intensity from about 200 mWs/cm2 to 3,500 mWs/cm2 for a dwell time of about 10 to 20 seconds, said effluent water stream flowing through said irradiation chamber exhibiting a turbid appearance and the residual level of bromine biocide present in the irradiated effluent water stream exiting the irradiation chamber is less than or equal to 0.1 mg/l;
- a deionizer for removing hardness in the form of cations present in said irradiated water;
- and
- a separation system for removing suspended and dissolved solids from said deionized water;
- whereby said formation of compounds which are less oxidative than said bromine biocide protects said deionizer and said separation system from degradation by said bromine biocide.
3 more elements
A water purification method comprising:
- introducing bromine biocide into an effluent water stream in an amount ranging from about 0.2 to 5.0 ppm;
- irradiating bromine biocide contained in said effluent water stream with radiation consisting essentially of ultraviolet radiation emitted from a single irradiation chamber ranging in intensity from about 200 mWs/cm2 to 3,500 mWs/cm2 for a dwell time of about 10 to 20 seconds, said cooling tower effluent stream flowing through said radiation exhibiting a turbid appearance and the residual level of bromine biocide present in the irradiated water stream exiting the radiation is less than or equal to 0.1 mg/l;
- allowing said irradiated bromine to react with cations contained in said effluent stream, thereby forming compounds which are less oxidative than said bromine biocide;
- removing ions from said effluent water stream following formation of said less oxidative compounds to merely soften the water;
- and
- separating suspended and dissolved solids from said softened water,
- whereby said formation of compounds which are less oxidative than said bromine biocide protects the apparatus used in said ion removal and separating steps from degradation by said bromine biocide.
4 more elements
A water purification system comprising:
- means for providing bromine biocide to a cooling tower effluent water stream, said effluent water steam exhibiting a pH of greater than 8.0;
- a single irradiation chamber consisting essentially of an ultraviolet radiation source providing radiation ranging in intensity from about 200 mWs/cm2 to 3500 mWs/cm2 treating said bromine biocide present in said effluent water stream in an amount ranging from bout 0.2 to 5.0 ppm, thereby forming compounds which are less oxidative than said bromine biocide, said effluent water stream flowing through said irradiation chamber exhibiting a turbid appearance and the residual level of bromine biocide present in the irradiated effluent water stream exiting the irradiation chamber is less than or equal to 1 mg/l;
- a deionizer for removing hardness in the form of cations present in said irradiated water;
- and
- a separation system for removing suspended and dissolved solids from said deionized water;
- whereby said formation of compounds which are less oxidative than said bromine biocide protects said deionizer and said separation system from degradation by said bromine biocide.
3 more elements
A water purification method comprising:
- introducing bromine biocide into a cooling tower effluent water stream in an amount ranging from about 0.2 to 5.0 ppm, said effluent water stream exhibiting a pH of greater than 8.0;
- irradiating bromine biocide contained in said effluent water stream with radiation consisting essentially of ultraviolet radiation emitted from a single irradiation chamber ranging in intensity from about 200 mWs/cm2 to 3,500 mWs/cm2, said effluent water stream flowing though said irradiation chamber exhibiting a turbid appearance and the residual level of bromine biocide present in the irradiated effluent water stream exiting the irradiation chamber is less than or equal to 0.1 mg/l;
- allowing said irradiated bromine to react with cations contained in said effluent stream, thereby forming compounds which are less oxidative than said bromine biocide;
- removing ions from said effluent water stream following formation of said less oxidative compounds to merely soften the water;
- and
- separating suspended and dissolved solids from said softened water,
- whereby said formation of compounds which are less oxidative than said bromine biocide protects the apparatus used in said ion removal and separating steps from degradation by said bromine biocide.
4 more elements
Dependencies are inferred from the claim text.