Method for treating water over an extended time using tablets and packets

• US 6,303,039 B1
• Filed: 03/06/2000
• Issued: 10/16/2001
• Est. Priority Date: 03/06/2000
• Status: Expired due to Term

• Current Assignee: Mainstream Engineering Coporation
• Original Assignee: Mainstream Engineering Coporation
• Inventors: Scaringe, Robert P., Meyer, John A., Back, Dwight D.
• Primary Examiner(s): Hoey, Betsey Morrison
• Application Number:
  US09/520,006
• Time in Patent Office: 589 Days
• Field of Search: 210/764, 210/192
• US Class Current: 210/764
• CPC Class Codes: C02F 1/505 by oligodynamic treatment
• CPC Class Codes: C02F 1/683 by addition of complex-forming compounds
• CPC Class Codes: C02F 2103/023 Water in cooling circuits

Abstract

A method to control microbial growth and other contaminants present in the water of climate control systems includes using tablets or packets to effectively control the growth of microbes such as fungus, molds, bacteria, and virus present in water for an extended period of time. The tablet or packet formulations include at least two metals and at least one chelating agent. Optionally, more soluble salts are also added to the formulations to induce an initial shock of the biologically active compounds in the water followed by a slower release of the less soluble chelating agents and metals.

Claims

1. A method for treating water, comprising:

producing a formulation comprising at least two biocide metals and at least one chelating agent, wherein said formulation dissolves over a period of months or longer; and

applying the formulation to the water to be treated.

2. The method of claim 1, wherein the at least two biocide metals are independently selected from the group consisting of Ag, Cu, Ni, Sn and Zn.

3. The method of claim 2, wherein at least one biocide metal comprises Ag selected from the group consisting of Ag₂CO₃, Ago, Ag metal, and AgCl.

4. The method of claim 2, wherein at least one biocide metal comprises Cu selected from the group consisting of CuO, Cu(I)Cl, CuF₂, and Cu metal.

5. The method of claim 2, wherein at least one biocide metal comprises Ni selected from the group consisting of Ni₃PO₄, NiO, and Ni metal.

6. The method of claim 2, at least one biocide metal comprises Zn selected from the group consisting of ZnCO₃, Zn laurate, Zn₃(PO₄)₂, Zn stearate and Zn metal.

7. The method of claim 2, wherein at least one biocide metal comprises Sn selected from the group consisting of SnO, SnO₂, tributyltin oxide, tributyltin chloride, tin oxalate, tin fluoride, and Sn metal.

8. The method of claim 1, wherein the at least one chelating agent is selected from the group consisting of salicylic acid, ethylenediaminetetraacetic acid, nitrilotriacetic acid, and diethylenetriamine pentaacetic acid.

9. The method of claim 1, wherein the at least one chelating agent is an aminopolycarboxylic compound.

10. The method of claim 1, wherein the at least one chelating agent is a metal salt of an aminopolycarboxylic acid.

11. The method of claim 1, wherein the water to be treated is present in a climate control system which is one of an air conditioner, a heat pump, a humidifier, and a de-humidifier.

12. The method of claim 1, wherein the at least one chelating agent is a biocide metal salt.

13. The method of claim 1, wherein at least one of the at least two biocide metals is a salt of a chelating agent.

14. The method of claim 1 wherein the formulation is produced by being pressed into a tablet form.

15. The method of claim 1, wherein the formulation is produced by being encased in a packet.

16. The method of claim 1, further comprising adding at least one water soluble metal salt and at least one water soluble chelating agent to the formulation, wherein the at least one water soluble metal salt and the at least one water soluble chelating agent are more soluble in water than the at least two biocide metals and the at least one chelating agent.

17. The method of claim 1, wherein the formulation dissolves and treats the water over a period of about 3 months or longer.

18. The method of claim 1, further comprising dispersing and holding the at least two biocide metals and at least one chelating agent into a wax or slightly soluble polymer.

19. The method of claim 1, wherein the formulation dissolves and treats the water over a period of at least 114 days.

20. The method of claim 1, wherein the formulation dissolves and treats the water over a period of at least 4 months.

21. The method of claim 1, wherein the formulation dissolves and treats the water over a period of at least 289 days.

22. A method for treating water, comprising:

producing a formulation comprising at least two biocide metals in a form that is soluble in water and at least one chelating agent, wherein said formulation dissolves over a period of months or longer; and

applying the formulation to water to be treated in a climate control system which is one of an air conditioner, a heat pump, a humidifier, or a de-humidifier.

23. A method for treating water, comprising:

producing a formulation comprising AgO, CuO, salicylic acid, ethylenediaminetetraacetic acid, and other excipients; and

applying the formulation to water to be treated in a climate control system which is one of an air conditioner, a heat pump, a humidifier, or a de-humidifier.

24. A method for treating water, comprising:

producing a formulation comprising at least two biocide metals and at least one chelating agent, wherein said formulation is slightly soluble in water; and

applying the formulation to the water to be treated.