WO1997028831B1

WO1997028831B1 - Method for thermally disinfecting waste, particularly biologically hazardous waste, and device therefor

Info

Publication number: WO1997028831B1
Application number: PCT/FR1997/000258
Authority: WO
Filing date: 1997-02-09
Publication date: 1997-10-16
Anticipated expiration: 1998-08-09

Abstract

A method for thermally disinfecting waste, particularly biologically hazardous waste, wherein the waste is placed in a compaction area and compressed, and the gases given off during waste compaction are filtered before being discharged. The mould is then sealed and heated, and the temperature and pressure therein are monitored. The waste is heated to 100-200 °C and all parts that have contacted the waste are also disinfected. A device for carrying out the method is also disclosed.

Claims

AMENDED CLAIMS [received by the International Bureau on 5 September 1997 (05.09.97); amended claim 6; other claims unchanged (3pages)]

1. A method of thermal disinfection of waste including biological hazards, characterized in that said waste is placed in a compacting zone, then subjected to pressure, the gases emitted by the compaction of said waste are filtered before being evacuated, then the mold is sealed and heating is applied by simultaneously controlling the temperature and

The pressure inside the mold, the temperature of said heating being included between 100 and

200 ° C, all the parts having been in contact with the waste being also disinfected.

2. A method of thermal disinfection of waste including biological hazards according to claim 1, characterized in that the waste is previously covered with

Polymer, preferably composite, or placed in a polymer bag, preferably composite, before being introduced into the compacting zone.

3. A method of heat disinfecting waste biohazard particular according to claim 2, characterized in that the bag is made of composite polymer, the external e _j surface of the bag being of polypropylene or polyamide and the inner surface of the bag being polyόthylène .

4. A method for thermal disinfection of waste including biological hazards according to any one of claims 1 to 3, characterized in that the heating temperature is greater than 134 ° C.

5. A method of thermal disinfection of waste including biological hazards according to any one of claims 1 to 4, characterized in that said method further comprises a demolding step including cooling to a temperature below

60 ° C of the compaction zone and the compacted waste it contains, the return of said zone to atmospheric pressure and the evacuation of the waste. 15

6. Device for thermal disinfection of waste including biological hazards comprising a riser 1, a piston 2 provided with a jack 3 a filter 6, a bag 11 filled with waste to be disinfected, heating means, means for sealing the container. characterized in that it further comprises a mold 4, a heat insulation 17 and a thermal insulation.

7. Device for thermal disinfection of waste including biological hazards according to claim 6, characterized in that it further contains a pressure sensor and / or a strain gauge and / or an isolation valve 14 and / or a extractor 16 and / or an evacuation hole 15 connected to an isolation valve 12 and / or a frame.

8. Device for thermal disinfection of waste including biological hazards according to any one of claims 6 or 7, characterized in that the face of the piston 2 which is in contact with the waste is provided with lugs 10.

9. Device for thermal disinfection of waste including biological hazards according to any one of claims 6 to 8, characterized in that the cylinder 3 is a hydraulic cylinder or a mechanical cylinder controlled by an electric motor.

10. Device for thermal disinfection of waste including biological hazards according to any one of claims 6 to 9, characterized in that said heating means are electrical resistors and / or varistors.

11. A device for thermal disinfection of waste including biological hazards according to any one of claims 6 to 10, characterized in that said means of sealing the device comprise o-rings or inflatable cleverly arranged and / or isolation valves 12 and 14. 16

12. Device for thermal disinfection of waste including biological hazards according to any one of claims 6 to 11, characterized in that the piston 2, the mold 4 and the guide extension 1 are totally or partially made of stainless metal having a sufficient hardness not to be scratched or deteriorated when compacting needles and scalpels.

13. Device for thermal disinfection of waste including biological hazards according to any one of claims β to 12, characterized in that the piston 2, the mold 4 and the guide extension 1 are totally or partially developed or covered in any metal with high thermal conductivity.

14. Device for thermal disinfection of wastes including biologically hazardous according to any one of claims β to 13, characterized in that the frame is provided with a stop 19.

15. Device for thermal disinfection of wastes including biologically hazardous according to any one of claims 6 to 14, characterized in that the filter 6 is placed so that the temperature of said filter and the space between waste and said filter 6 is substantially equal to the temperature of the compaction zone.

16. Device for thermal disinfection of waste including biological hazards according to any one of claims 6 to 15, characterized in that the filter 6 is a very high efficiency filter such as in particular a mineral membrane and / or activated carbon and / or Teflon felt.

17. Device for thermal disinfection of waste including biological hazards according to any one of claims β to 16, characterized in that the pressure sensor and / or the strain gauge is disposed on the hydraulic circuit of the cylinder 3.

MODIFIED SHEET (ARTICL F 19)