초록

Water purification system comprising filtration media sized with respect to each other to allow a first contaminant in the water to saturate the first medium with a delay prior to saturation of the second medium with a second contaminant.

대표청구항 ▼

1. A method of treating water, comprising the steps of: determining levels of contaminants in the water, wherein said contaminants comprise algal contaminants and arsenic;testing first and second filter media respectively adapted to remove said algal contaminants and arsenic to determine the length

1. A method of treating water, comprising the steps of: determining levels of contaminants in the water, wherein said contaminants comprise algal contaminants and arsenic;testing first and second filter media respectively adapted to remove said algal contaminants and arsenic to determine the length of time for said media to become saturated with said respective contaminants;selecting volumes of said respective filter media to achieve treatment of said water and;treating said water with said filter media such that said first media becomes saturated with said algal contaminants with a delay prior to saturation of the second media with arsenic contaminants. 2. A method according to claim 1, wherein said filter media are arranged in a point of use (POU) water purification system comprising at least said two filtration media. 3. A method according to claim 2, wherein said at least two filtration media are located upstream of a water reservoir. 4. A method according to claim 2, wherein a prefilter is provided immediately upstream of said at least two filtration media for removal of large particles and sediment from the water. 5. A method according to claim 2, wherein chlorine is a contaminant. 6. A method according to claim 2, wherein a said first filtration media is activated carbon and is adapted to also remove chlorine and said second filtration media is activated alumina, granulated ferric oxide and/or granulated ferric hydroxide. 7. A method according to claim 2, wherein time release capsules are provided to impart flavor to indicate end-point detection of one or more of the filtration media. 8. A method according to claim 2, wherein color time release capsules are provided to impart color to indicate end-point-detection of the filtration media. 9. A method according to claim 2, wherein time release capsules are provided for introducing desirable flavor or a therapeutic substance into the water. 10. A method according to claim 9, wherein the time release capsules are positioned such that the flavor is introduced into the water in a last stage of the system. 11. A method according to claim 2, wherein a membrane is present for filtering out pathogens present in the water, said membrane having pore sizes comparable with or smaller than the pathogen. 12. A method according to claim 2 wherein a membrane is provided for filtering out pathogens present in the water and time release capsules are provided for time releasing disinfection compounds to disinfect the water. 13. A method according to claim 2, wherein a system for arsenic removal is present with a hydraulic loading rate of below 2.5 GPM/ft2 to extend media bed lifetime. 14. A method according to claim 2, wherein a small pore membrane filter is provided having a surface area greater than that of a flat sheet of the membrane filter through pleating or bundling of fibers. 15. A method according to claim 1, wherein the algal contaminants which are tested comprise taste-imparting contaminants comprising geosmin and/or methylisoborneol (MIB). 16. A method according to claim 1, wherein time release capsules are present for time releasing disinfection compounds to disinfect the water. 17. A method according to claim 16, wherein the disinfection compounds are selected from the group consisting of chlorine, bromine, iodine and combinations thereof. 18. A method according to claim 16 wherein the disinfection compounds are selected from the group consisting of sodium hypochlorite, calcium hypochlorite, bromochloro-5,5-dimethylhydantoin, trichloroisocyanuric acid, sodium dichloroisocyanurate dihydrate, 1,3-dibromo-5,5-dimethylhydantoin, and 1,3-dichloro-5,5-dimethylhydantoin. 19. A method according to claim 16 wherein the disinfection time release capsule is a disinfection compound embedded in a polymer matrix. 20. A method according to claim 16 wherein the disinfection compound is a halogen disinfection compound which is encapsulated by a polymer coating and released by diffusion through the bulk of the coating. 21. A method according to claim 16 wherein the disinfection compound in a slow dissolving non-polymer matrix which permits consistent release over time due to fixed solubility of the host material. 22. A method according to claim 16, wherein addition of disinfection compounds is at a first higher level to achieve disinfection, followed by removal to a second lower level prior to ingestion by the user. 23. A method according to claim 16, wherein addition of disinfection compounds is effected via a polymer matrix where the polymer matrix is ethylene vinyl acetate. 24. A method according to claim 16 wherein beneficial compounds are added in a time release form such that they are not removed by the filter. 25. A method according to claim 16 wherein beneficial compounds are introduced in a last stage of the filtration system.