Water disinfection system using simultaneous multiple disinfectants

• US 20060124558A1
• Filed: 12/15/2004
• Published: 06/15/2006
• Est. Priority Date: 12/15/2004
• Status: Active Grant

• Current Assignee: Yao B. Kouame
• Original Assignee: Yao B. Kouame
• Inventors: Kouame, Yao B.
• Granted Patent: US 7,332,076 B2
• Time in Patent Office: Days
• US Class Current: 210/764
• CPC Class Codes: C02F 1/50 by addition or application of a germicide or by oligodynamic treatment C02F1/4606, C02F1/467, C02F1/76 take precedence
• CPC Class Codes: C02F 1/76 with halogens or compounds of halogens C02F1/4674 takes precedence
• CPC Class Codes: C02F 9/00 Multistage treatment of water, waste water or sewage
• CPC Class Codes: Y02W 10/37 using solar energy

Abstract

A water disinfection system using simultaneous multiple disinfectants includes a completely stirred tank reactor (CSTR) and a contact basin or clearwell acting as a plug flow reactor (PFR). The CSTR receives ammoniated water and free chlorine, and generates multiple disinfectants in primary disinfection water within the CSTR. The contact basin or clearwell receives primary disinfected water from the CSTR, the primary disinfected water containing the disinfectants. A method for water disinfection including mixing the non-disinfected treated water with ammonia to form ammoniated water, mixing the ammoniated water with free chlorine to form a primary disinfection water including multiple disinfectants, and maintaining the disinfectants in the primary disinfection water.

Claims

1. A system for water disinfection comprising:

a completely stirred tank reactor (CSTR) receiving ammoniated water and free chlorine to form primary disinfection water, the CSTR generating disinfectants in the primary disinfection water; and

a contact basin receiving primary disinfected water from the CSTR, the primary disinfected water containing the disinfectants.

2. The system of claim 1 wherein the disinfectants are residual free chlorine, monochloramine, and dichloramine.

3. The system of claim 1 further comprising an ammonia unit mixing ammonia with non-disinfected treated water to form the ammoniated water.

4. The system of claim 3 further comprising an upstream treatment unit providing the non-disinfected treated water, the upstream treatment unit selected from the group consisting of a filtration unit, a secondary clarifier unit, a multimedia filtration unit, a carbon adsorption unit, a tertiary wastewater polishing unit, and combinations thereof.

5. The system of claim 1 further comprising a chlorine unit providing the free chlorine.

6. The system of claim 1 wherein the ammoniated water is non-disinfected treated water.

7. The system of claim 1 wherein the contact basin is selected from the group consisting of a plug flow reactor (PFR), a chlorine contact basin, and a clearwell.

8. A method for water disinfection comprising:

mixing non-disinfected treated water with ammonia to form ammoniated water;

mixing the ammoniated water with free chlorine to form primary disinfection water including disinfectants; and

maintaining the disinfectants in the primary disinfection water.

9. The method of claim 8 wherein the mixing the ammoniated water with free chlorine to form primary disinfection water including disinfectants comprises mixing the ammoniated water with the free chlorine to form the primary disinfection water including residual free chlorine, monochloramine, and dichloramine.

10. The method of claim 8 wherein the maintaining the disinfectants in the primary disinfection water comprises maintaining the primary disinfection water within a completely stirred tank reactor (CSTR) to form monochloramine and dichloramine.

11. The method of claim 8 further comprising pretreating non-disinfected water to produce the non-disinfected treated water.

12. The method of claim 11 wherein the pretreating non-disinfected water comprises pretreating the non-disinfected water by a method selected from the group consisting of filtration, secondary clarification, carbon adsorption, tertiary wastewater effluent polishing, and combinations thereof.

13. The method of claim 8 wherein the mixing the ammoniated water with free chlorine to form a primary disinfection water including disinfectants comprises mixing the ammoniated water with the free chlorine in a completely stirred tank reactor (CSTR).

14. The method of claim 8 wherein the mixing the ammoniated water with free chlorine to form primary disinfection water including disinfectants comprises mixing the ammoniated water with free chlorine to form stable concentrations of the disinfectants.

15. The method of claim 8 further comprising routing the primary disinfection water as primary disinfected water, and maintaining the disinfectants in the primary disinfected water.

16. The method of claim 15 wherein the maintaining the disinfectants in the primary disinfected water comprises maintaining the disinfectants in the primary disinfected water in a contact basin.

17. The method of claim 16 wherein the contact basin creates plug flow of the primary disinfected water.

18. The method of claim 15 wherein the maintaining the disinfectants in the primary disinfected water comprises maintaining the disinfectants in the primary disinfected water until monochloramine with trace amounts of free chlorine and dichloramine remain.

19. The method of claim 8 further comprising maintaining pH of the primary disinfection water in the range of 5.0 to 8.5.

20. The method of claim 8 further comprising maintaining pH of the primary disinfection water in the range of 7 to 8.

21. The method of claim 8 further comprising maintaining chlorine to ammonia mass ratio of the primary disinfection water in the range of 3:

1 to 10;

1.

22. The method of claim 8 further comprising maintaining chlorine to ammonia mass ratio of the primary disinfection water in the range of 3.5:

1 to 4.5;

1.

23. The method of claim 8 further comprising maintaining chlorine to ammonia mass ratio of the primary disinfection water in the range of 5:

1 to 7;

1.

24. A system for disinfection of water comprising:

means for mixing non-disinfected treated water with ammonia to form ammoniated water;

means for mixing the ammoniated water with free chlorine to form primary disinfection water including disinfectants; and

means for maintaining the disinfectants in the primary disinfection water.

25. The system of claim 24 wherein the means for mixing of the ammoniated water with free chlorine to form primary disinfection water including disinfectants comprises means for mixing the ammoniated water with free chlorine to form the primary disinfection water including residual free chlorine, monochloramine, and dichloramine.

26. The system of claim 24 wherein the means for maintaining the disinfectants in the primary disinfection water comprises means for maintaining the primary disinfection water within a completely stirred tank reactor (CSTR) to form monochloramine and dichloramine.

27. The system of claim 24 further comprising means for pretreating non-disinfected water to produce the non-disinfected treated water.

28. The system of claim 24 wherein the means for mixing the ammoniated water with free chlorine to form a primary disinfection water including disinfectants comprises means for mixing the ammoniated water with the free chlorine in a completely stirred tank reactor (CSTR).

29. The system of claim 24 further comprising means for routing the primary disinfection water as primary disinfected water, and means for maintaining the disinfectants in the primary disinfected water.

30. A system for water disinfection comprising:

a tank;

a first inlet connected to the tank, the first inlet providing a first solution;

a second inlet connected to the tank, the second inlet providing a second solution;

wherein the first solution and the second solution mix to form primary disinfection water including simultaneous multiple disinfectants.

31. The system of claim 30 wherein the first inlet is a water inlet providing ammoniated water and the second inlet is a chlorine inlet providing free chlorine.

32. The system of claim 30 wherein the simultaneous multiple disinfectants are residual free chlorine, monochloramine, and dichloramine.

33. The system of claim 30 further comprising an outlet connected to the tank, the outlet carrying primary disinfected water.

34. The system of claim 30 further comprising an impeller disposed in the tank.

35. The system of claim 30 further comprising baffles connected to the tank.