Method and apparatus for treating and disinfecting infectious wastes

• US 5,387,350 A
• Filed: 08/16/1993
• Issued: 02/07/1995
• Est. Priority Date: 11/20/1989
• Status: Expired due to Fees

• Current Assignee: George L. Williamson
• Original Assignee: George L. Williamson
• Inventors: Mason, James A.
• Primary Examiner(s): McCarthy, Neil
• Application Number:
  US08/106,882
• Time in Patent Office: 540 Days
• Field of Search: 210/754, 210/764, 210/198.1, 210/205, 210/206, 210/199, 210/755, 210/756, 210/173, 422/28, 422/32, 422/37, 422/242, 422/295, 422/33
• US Class Current: 210/754
• CPC Class Codes: C01B 7/01 Chlorine; Hydrogen chloride
• CPC Class Codes: C02F 1/02 by heating methods of steam generation F22B; preheating boiler feed-water or accumulating preheated boiler feed-water F22D
• 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 2103/023 Water in cooling circuits

Abstract

The present invention describes a novel method and apparatus for treating and/or disinfecting medical wastes wherein the medical wastes may be shredded and the contact vessel may be sealed and may be under greater pressure than atmospheric pressure and may have a detention time of no more than 5 minutes. An organic hydroxy acid or carboxylic acid and an alkali metal or alkaline earth metal chlorite are mixed in the contact vessel. The reaction between the acid and chlorite produces chlorine dioxide which is the active substance used to treat and/or disinfect the medical wastes.

Claims

1. In a process for treating and disinfecting infectious wastes which includes introducing an aqueous solution into a chamber containing infectious wastes the improvement comprising the steps of:

(a) introducing into the chamber containing said infectious wastes an aqueous solution prepared by mixing (1) an organic hydroxy acid or carboxylic acid and (2) an alkali metal or alkaline earth metal chlorite;

(b) sealing the contents of said chamber from the atmosphere;

(c) pressurizing the contents of said chamber to a pressure greater than atmospheric pressure; and

,

(d) detaining the contents of said chamber for a period of time of no more than 15 minutes whereby substantially all bacteria, microbes and other pathogenic organisms are destroyed in said infectious wastes.

2. The process of claim 1, further comprising shredding said infectious wastes.

3. The process of claim 1, further comprising mixing said infectious wastes

4. The process of claim 1, further comprising detaining the contents of said chamber for a period of time of no more than 5 minutes.

19. The process of claim 1, wherein the contents of said chamber is under a pressure ranging from about one atmosphere to about two atmospheres.

5. In a process for treating and disinfecting infectious wastes which includes introducing an aqueous solution into a chamber containing infectious wastes, the improvement comprising the steps of:

(a) introducing into the chamber containing said infectious wastes an aqueous solution prepared by mixing (1) lactic acid and (2) sodium chlorite;

(b) sealing the contents of said chamber from the atmosphere;

(c) pressurizing the contents of said chamber to a pressure greater than atmospheric pressure; and

,

(d) detaining the contents of said chamber for a period of time of no more than 15 minutes whereby substantially all bacteria, microbes and other pathogenic organisms are destroyed in said infectious wastes.

6. The process of claim 5, wherein the organic acid is citric acid.

7. The process of claim 5, wherein the organic acid is malic acid.

8. The process of claim 5, wherein the organic acid is tartaric acid.

9. The process of claim 5, wherein the organic acid is glycolic acid.

10. The process of claim 5, wherein the organic acid is mandelic acid.

11. The process of claim 5, wherein the organic acid is oxalic acid.

12. The process of claim 5, further comprising shredding said infectious wastes.

13. The process of claim 5, further comprising mixing said infectious wastes.

14. The process of claim 5, further comprising detaining the contents of said chamber for a period of time of no more than 5 minutes.

20. The process of claim 5, wherein the contents of said chamber is under a pressure ranging from about one atmosphere to about two atmospheres.

15. An apparatus for treating and disinfecting infectious wastes comprising:

(a) a chamber;

(b) said chamber having an inlet means and an outlet means for infectious wastes;

(c) means containing an aqueous solution of (1) an organic hydroxy acid or carboxylic acid and (2) an alkali metal or alkaline earth metal chlorite;

(d) means for providing said aqueous solution to said chamber;

(e) said chamber being sized to provide a detention time of no more than 15 minutes for the infectious wastes;

(f) said chamber being sealed from the atmosphere; and

,

(g) said apparatus having pressurizing means for providing a pressure greater than one atmosphere on the contents of said chamber thereby effective to destroy substantially all bacteria, microbes and other pathogenic organisms in said infectious wastes.

16. The apparatus of claim 15, further comprising means for shredding.

17. The apparatus of claim 15, further comprising means for mixing.

18. The apparatus of claim 15, further comprising said chamber being sized to provide a detention time of no more than 5 minutes for the infectious waste.

21. The apparatus of claim 15, further comprising pressurizing means for providing a pressure on the contents of said chamber ranging from about one atmosphere to about two atmospheres.