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A method for stabilizing and removing Cryptosporidium oocysts or Giardia cysts from water. The method comprises adding chitosan, a salt or solution of chitosan to water containing Cryptosporidium oocysts or Giardia cysts and a halogenating agent. The method may also include adding a secondary poly

A method for stabilizing and removing Cryptosporidium oocysts or Giardia cysts from water. The method comprises adding chitosan, a salt or solution of chitosan to water containing Cryptosporidium oocysts or Giardia cysts and a halogenating agent. The method may also include adding a secondary polyelectrolyte flocculant to the water. The resulting flocs are filtered to remove the Cryptosporidium oocysts or Giardia cysts.

대표청구항 ▼

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1. A method for removing Cryptosporidium oocysts or Giardia cysts from recreational water containing a halogenating agent, comprising: adding chitosan to the water comprising Cryptospori

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1. A method for removing Cryptosporidium oocysts or Giardia cysts from recreational water containing a halogenating agent, comprising: adding chitosan to the water comprising Cryptosporidium oocysts or Giardia cysts and a halogenating agent, wherein the Cryptosporidium oocysts or Giardia cysts have been exposed to the halogenating agent for a period of time effective to oxidize at least a portion of the Cryptosporidium oocysts or Giardia cysts, before adding the chitosan to the water; allowing the Cryptosporidium oocysts or Giardia cysts and the chitosan to form stabilized flocs in the water; and filtering the flocs of the Cryptosporidium oocysts or Giardia cysts and chitosan to remove the Cryptosporidium oocysts or Giardia cysts from the water. 2. The method of claim 1, wherein the chitosan is in solution. 3. The method of claim 2, wherein the solution comprises acetic acid. 4. The method of claim 1, further comprising adding an anionic or cationic polyelectrolyte flocculant to the water before, during or after adding the chitosan. 5. The method of claim 4, wherein the polyelectrolyte flocculant comprises at least one of alginate, hexametaphosphate, carboxymethylcellulose, pectin, polyaluminum hydroxychioride, polyaluminum silicate sulfate, polyaluminum sulfate or polyacrylamide. 6. The method of claim 4, wherein said polyelectrolyte flocculant is about 5 ppb to about 100 ppm by weight in water. 7. The method of claim 1, wherein the water is in a swimming pool, spa, water park, hot tub, or bath. 8. The method of claim 1, comprising filtering the floes in at least one of a sand, cartridge or diatomaceous earth filter. 9. The method of claim 1, further comprising adding an inorganic aluminum coagulant. 10. The method of claim 9, wherein said inorganic aluminum coagulant is aluminum sulfate or polyaluminum chloride. 11. The method of claim 9, wherein the inorganic aluminum coagulant is about 50 ppb to about 100 ppm by weight in water. 12. The method of claim 1, further comprising adding a ferric salt coagulant. 13. The method of claim 12, wherein said ferric salt coagulant is ferric sulfate or ferric chloride. 14. The method of claim 12, wherein said ferric salt coagulant is about 50 ppb to about 100 ppm by weight in water. 15. The method of claim 1, wherein said chitosan is about 5 ppb to about 100 ppm by weight in water. 16. The method of claim 1, wherein the halogenating agent comprises at least one of sodium hypochlorite, calcium hypochlorite, chlorine, hypochlorous acid, bromine, hypobromous acid, N-chlorosuccinimide, sodium hypobromite, pyridinium bromide perbromide, N-bromosuccinimide, chloramine-T, chlorhexadine, biguanides, dichlorodimethylhydantoin, bromochlorodimethylhydantoin dibromodimethylhydantoin, dichloroisocyanurate, or trichloroisocyanurate. 17. The method of claim 1, wherein said halogenating agent is about 1 ppm to about 50 ppm by weight in water. 18. The method of claim 1, wherein said halogenating agent is about 2 ppm to about 20 ppm by weight in water. 19. The method of claim 1, comprising adding a halogenating agent to the water before adding chitosan.