Method and apparatus for pretreatment of hazardous waste material

• US 6,096,219 A
• Filed: 05/12/1998
• Issued: 08/01/2000
• Est. Priority Date: 11/12/1996
• Status: Expired due to Fees

• Current Assignee: Sanitrol Systems Incorporated
• Original Assignee: Sanitrol Systems Incorporated
• Inventors: Green, Lawrence M., Nickelsen, Michael G.
• Primary Examiner(s): Simmons, David A.
• Assistant Examiner(s): HOEY, BETSEY MORRISON
• Application Number:
  US09/076,609
• Time in Patent Office: 812 Days
• Field of Search: 210/695, 210/748, 210/750, 210/752, 210/760, 210/764, 210/192, 210/194, 210/199, 210/205, 210/173, 422/22, 422/24, 422/28, 422/186, 422/186.3, 422/186.01, 422/186.07, 588/219, 588/227
• US Class Current: 210/695
• CPC Class Codes: A61L 11/00 Methods specially adapted for refuse disintegrating medical waste B02C19/0075; disposal of medical waste B09B3/00
• CPC Class Codes: A61L 2/10 Ultraviolet radiation
• CPC Class Codes: A61L 2/202 Ozone
• CPC Class Codes: B01J 19/087 employing electric or magnetic energy
• CPC Class Codes: B01J 19/088 giving rise to electric discharges for heating purposes H05B7/00; for the production of ozone C01B13/11, H01T19/00
• CPC Class Codes: B01J 19/123 Ultraviolet light
• CPC Class Codes: B01J 2219/0845 Details relating to the type of discharge
• CPC Class Codes: B01J 2219/0852 employing permanent magnets
• CPC Class Codes: B01J 2219/0854 employing electromagnets
• CPC Class Codes: C02F 1/32 with ultraviolet light
• CPC Class Codes: C02F 1/325 Irradiation devices or lamp constructions
• CPC Class Codes: C02F 1/463 by electrocoagulation
• CPC Class Codes: C02F 1/48 with magnetic or electric fields C02F1/46 takes precedence
• CPC Class Codes: C02F 1/505 by oligodynamic treatment
• CPC Class Codes: C02F 1/52 by flocculation or precipitation of suspended impurities C02F1/463 takes precedence
• CPC Class Codes: C02F 1/78 with ozone C02F1/4672 takes precedence
• CPC Class Codes: C02F 2103/002 Grey water, e.g. from clothes washers, showers or dishwashers
• CPC Class Codes: C02F 2201/328 Having flow diverters (baffles)
• CPC Class Codes: C02F 9/00 Multistage treatment of water, waste water or sewage
• CPC Class Codes: C02F 9/20 Portable or detachable small-scale multistage treatment devices, e.g. point of use or laboratory water purification systems

Abstract

The present invention provides a method for the pre-treatment of hazardous biological and chemical contaminants from a waste fluid stream prior to discharge to a waste water treatment facility such as a publicly owned water treatment works or a similar privately operated facility. The method includes breaking apart tissue samples with a macerator, contacting a waste fluid stream with ozone, preferably in a vibrational mixer, which thereby acts as a promoter of hydroxyl radicals, passing the mixture through strong and weak unpolarized magnetic fields, static discharge and neutralization units, and finally, exposing the mixture to ultraviolet radiation. If found necessary, a subsequent static discharge and neutralization unit may be employed.

Claims

1. A process for the pre-treatment of liquid material comprising the steps of:

exposure to ozone, exposure to strong and weak un-polarized magnetic fields, exposure to static discharge removal material, exposure to a promoter of hydroxyl radicals, and exposure to ultraviolet radiation.

2. The process of claim 1 wherein the step of exposure to static discharge removal material comprises the exposure of said liquid material to a sacrificial zinc anode.

3. The process of claim 1 wherein the step of exposure to strong and weak un-polarized magnetic fields comprises first exposing said liquid material to an un-polarized 10,000 Gauss magnetic field then exposing said liquid material to an un-polarized 2,000 Gauss magnetic field.

4. A multi-stage, multi-phase apparatus for removal of solid, chemical and bacterial waste from a contaminated aqueous solution, comprising, in combination:

a first stage, including means defining a reaction tank for initial ozone treatment of waste matter in a contaminated fluid;

an injection port for injecting an aqueous slurry of contaminated solids into said tank;

a nozzle means disposed in a lower portion of said tank for injecting ozone into said aqueous slurry in said tank;

ozone generator means for supplying ozone to said tank;

means to withdraw fluid from said tank into a fluid discharge line;

means for exposing said fluid withdrawn from said tank to a strong, unpolarized linear magnetic field in the range of 2000 to 10000 Gauss;

means to discharge and neutralize static in said waste material;

means to expose said waste material to ultraviolet light; and

,

means to inject further amounts of ozone into said waste material in a mixing apparatus, whereby contaminants in said waste material are neutralized or destroyed.

5. The apparatus of claim 4 further including means for recirculation of a predetermined quantity of mixed fluid to said tank, comprising a recirculation line connecting said outlet from said mixing apparatus to said tank for continuously recirculating part or all of said waste material to said tank.

6. The apparatus of claim 4, wherein static discharge and neutralization means is provided downstream of said mixer.

7. The apparatus of claim 4, wherein a weak unpolarized linear magnetic field treatment means is positioned downstream of said strong unpolarized magnetic field treatment means.

8. The apparatus of claim 4, wherein said tank contains serially spaced baffles in the path of flow of said waste material so as to cause intermixing of oxidant and waste material.

9. The apparatus of claim 4, wherein said means to inject further quantities of ozone comprises an ozone recovery line extending from said tank to a Mazzei injector positioned upstream from said mixer.

10. The apparatus of claim 4, wherein means is provided, downstream of said ultraviolet light means for degassing said mixed fluid.

11. The apparatus of claim 4 wherein said means to discharge and neutralize static in said waste material comprises a sacrificial zinc anode placed in direct contact with said contaminated aqueous solution.

12. In a multi-phase apparatus for removal of chemical and bacterial waste from a mixture of contaminated solids suspended in contaminated aqueous solution, the combination of:

a tank comprising a holding and reaction vessel;

means to place contaminated solids suspended in contaminated aqueous fluid into said tank;

a fluid discharge means from said tank;

a pump in said fluid discharge line for removing said fluid under pressure;

a first hollow cylindrical magnetic field means for exposing waste material received from said pump to a strong, unpolarized linear magnetic field in the range of 2000 to 10000 Gauss;

a second hollow cylindrical magnetic field means for exposing waste material received from said first magnetic field means for exposing waste material to a weak unpolarized linear magnetic field in the range of up to 2000 Gauss;

a static discharge and neutralization unit located downstream of said second magnetic field means to remove static from said waste material;

means for treating said waste material with ultraviolet light;

means to inject and mix unreacted ozone from said tank into said waste material downstream of said ultraviolet treatment means to complete purification thereof.

13. The apparatus of claim 12 further including a second ultraviolet treatment means and an additional static discharge and neutralization unit.

14. The apparatus of claim 12 further including a recycle means to recycle part or all of said waste material to said tank for reprocessing.

15. A method of pretreating contaminated aqueous materials having hazardous chemical and biological contaminants therein prior to discharge to a waste water treatment facility comprising the steps of:

breaking apart tissue and other solids in a macerator and combining said solids with water to form an aqueous waste material;

contacting said waste material with ozone in an ozone treatment tank;

passing said waste material through a strong unpolarized linear magnetic field;

passing said mixture through a static discharge and neutralization unit;

exposing said material to ultraviolet radiation in an ultraviolet radiation chamber;

injecting ozone into said material in a Mazzei injector;

subjecting said material and ozone to intense vibrational mixing in a vibrational mixer;

whereby said contaminants in said material are rendered sufficiently innocuous for discharge of the material into a waste water treatment facility.

16. The method of claim 15 wherein said step of treatment in a magnetic field is conducted in a strong unpolarized magnetic field having a strength in the range of 2000 to 10000 Gauss.

17. The method of claim 15 further including the step of subjecting said material to a second linear unpolarized magnetic field having a strength of up to 2000 Gauss.

18. The method of claim 15 further including the steps of subjecting said material to a second ultraviolet radiation treatment and a second static discharge and neutralization step prior to discharge.

19. The method of claim 15 further including the step of recycling a portion of the treated material to the tank.