Method of and system for treating mixed radioactive and hazardous wastes

• US 5,640,702 A
• Filed: 09/01/1994
• Issued: 06/17/1997
• Est. Priority Date: 03/17/1992
• Status: Expired due to Fees

• Current Assignee: Clifford G. Shultz
• Original Assignee: Clifford G. Shultz
• Inventors: Shultz, Clifford G.
• Primary Examiner(s): MAI, NGOCLAN THI
• Application Number:
  US08/299,603
• Time in Patent Office: 1,020 Days
• Field of Search: 588/1, 588/201
• US Class Current: 588/1
• CPC Class Codes: A62D 2101/04 Pesticides, e.g. insecticides, herbicides, fungicides or nematocides
• CPC Class Codes: A62D 2101/20 Organic substances
• CPC Class Codes: A62D 2101/22 containing halogen
• CPC Class Codes: A62D 2101/26 containing nitrogen or phosphorus
• CPC Class Codes: A62D 2101/28 containing oxygen, sulfur, selenium or tellurium, i.e. chalcogen
• CPC Class Codes: A62D 2101/40 Inorganic substances
• CPC Class Codes: A62D 2101/43 containing heavy metals, in the bonded or free state
• CPC Class Codes: A62D 2101/45 containing nitrogen or phosphorus
• CPC Class Codes: A62D 2101/47 containing oxygen, sulfur, selenium or tellurium, i.e. chalcogen
• CPC Class Codes: A62D 2101/49 containing halogen
• CPC Class Codes: A62D 3/32 by treatment in molten chemical reagent, e.g. salts or metals
• CPC Class Codes: G21F 9/00 Treating radioactively contaminated material; Decontamination arrangements therefor
• CPC Class Codes: G21F 9/06 Processing separating different isotopes of the same chemical element B01D59/00
• CPC Class Codes: G21F 9/30 Processing separating different isotopes of the same chemical element B01D59/00
• CPC Class Codes: G21F 9/302 in an inorganic matrix

Abstract

There is disclosed an improved method and system for the selective treatment and volume reduction of mixtures of gaseous, liquid and solid contaminated waste materials. The contaminated waste materials include mixtures of hazardous and/or radioactive wastes which react with selected active reducing metals in liquid form, preferably aluminum.

Claims

1. A method of reducing the volume of any individual or combination of a) hazardous wastes which are contaminated with radioactive wastes, b) non-hazardous materials which are contaminated with radioactive wastes, c) non-hazardous wastes which are contaminated with hazardous wastes, the method comprising the steps of:

(a) directing the solid, liquid, or gaseous contaminated materials to a molten reducing metal reaction chamber;

(b) applying a reduction metal in molten form so as to contact the contaminated waste materials in the reaction chamber, thereby chemically reducing them to moieties which are nontoxic except by virtue of their radioactivity;

(c) removing at least a portion of unreacted molten metal and reacted waste materials from the reaction chamber so as to allow them to solidify thereby producing a substantially less hazardous final product which is easily and safely disposable in a significantly smaller space than that occupied by the original waste materials; and

(d) showering the hazardous material with the molten metal by means of a shower or curtain of molten metal in the reaction chamber.

2. The method of claim 1 wherein said showering step (d) provides a circuitous path for the gases and vaporized solid or liquid contaminants and their reaction products to pass through to insure complete reduction.

4. The method of claim 1 wherein the molten metal comprises other metal contaminants which may be inert to reaction.

3. A method of reducing the volume of any individual or combination of a) hazardous wastes which are contaminated with radioactive wastes, b) non-hazardous materials which are contaminated with radioactive wastes, c) non-hazardous wastes which are contaminated with hazardous wastes, the method comprising the steps of:

(a) directing the solid, liquid, or gaseous contaminated materials to a molten reducing metal reaction chamber;

(b) applying a reduction metal in molten form so as to contact the contaminated waste materials in the reaction chamber, thereby chemically reducing them to moieties which are nontoxic except by virtue of their radioactivity, said step of applying including applying liquid aluminum from a reservoir to contact the gaseous, liquid or solid waste contaminants to effect reduction, and a sub step of recirculating the showered aluminum from the reservoir to the reaction chamber;

(c) removing at least a portion of unreacted molten metal and reacted waste materials from the reaction chamber so as to allow them to solidify thereby producing a substantially less hazardous final product which is easily and safely disposable in a significantly smaller space than that occupied by the original waste materials; and

(d) showering the hazardous material with the molten metal by means of a shower or curtain of molten metal in the reaction chamber.

5. A method of chemically reducing waste materials, including mixtures of wastes which are both hazardous and radioactive, or non-hazardous and radioactive, comprising the steps of:

(a) directing gaseous, or liquid wastes from a first source thereof to an operating chamber;

(b) directing solid wastes from a second source thereof to the operating chamber;

(c) providing a source of molten aluminum at the operating chamber;

(d) contacting the waste materials with the molten aluminum,

said contacting the molten aluminum being done in such a manner that the aluminum contacts the waste materials and their reaction products for a sufficiently long time to bring about complete reduction reactions therewith to thereby diminish the volume of the hazardous and radioactive waste materials.

6. The method of claim 5 wherein the waste materials are from a group including non-radioactive, non-hazardous implements and materials of metal, plastic, glass, paper, or biological materials which have been used, treated with or contaminated by radioactive materials.

7. The method of claim 5 wherein the waste materials are from a group containing hazardous materials in the form of solvents, chemical reagents, poisons, or diseased biological materials and which have been used in conjunction with, or contaminated by, radioactive materials.

8. The method of claim 5 wherein the waste materials are from a group including non-radioactive implements and materials of metal plastic, paper or biological materials which have been used, treated with, or contaminated by radioactive materials;

and with otherwise hazardous materials in the form of solvents, chemical reagents, poisons, or diseased biological materials.

9. The method of claim 8 wherein the non-radioactive, non-hazardous waste materials may be from a group including syringes, needles, animal cages, specimen containers, glass tubes, vials, caps, tissues, towels, clothing, surgical implements, mechanical contrivances, and any other implement of device used in experimentation, industrial use or power generation using radioactive materials, and which have been or may have been contaminated by radioactive materials.

10. The method of claim 8 wherein the radioactive materials may be from the group including radio-nuclides occurring naturally;

those that have been produced by nuclear fission or fusion, or by particle accelerators or other artificial means.

11. The method of claim 7 wherein the solvents, chemical reagents or poisons may be selected from:

a) halogenated hydrocarbons, including polychlorinated biphenyls, chlorinated dioxins, chlorinated furans, and all aromatic an aliphatic organic compounds, solvents, insecticides or herbicides which are partially or completely chlorinated;

b) hazardous halogenated or non-halogenated organic compounds containing as substituents, oxygen, nitrogen, sulfur or phosphorus, either singly or in combination with other elements;

to include aldehydes, ketones, alcohols, carboxylic acids, esters, ethers, nitriles, amines, sulfides, thiols, thioketones, thiocarbonyls, mercaptans, phosphates, phosphites, phosphonates, phosphines and phosphine oxides, nitro compounds, nitroso compounds, amides, and amino acids, amino alcohols, sulfonic acids, sulfonates, and sulfones, thioamines, amino-thiols, and any other combinations of these with each other, or with other elements;

c) nerve gases, cholinesterase inhibitors, mustard gases, and other military chemical agents;

d) heavy metal salts, sulfates, sulfites, chlorides, nitrates, organic acid salts, heavy metal salts, oxides, sulfides and selenides, e) anionic groups containing heavy metal and oxygen, sulfur or selenium;

f) phosphorus and selenium sulfides and oxides;

g) oxidizing anionic groups containing halogen;

h) anionic groups containing sulfur or nitrogen;

i) hazardous halides; and

j) cyanides.

12. The method of claim 6 wherein the biological materials are from a group including tissues from mammals, biological fluids, infectious bacteria, viruses, spores;

or carcinogenic agents.

13. A method of reducing the volume of liquid, solid, gaseous radioactively contaminated waste materials including radioactive elements, comprising the steps of:

(a) directing liquid, solid and gaseous radioactive contaminated waste materials to a molten reducing metal reaction chamber;

(b) applying a reduction metal in molten form so as to contact the radioactive contaminated solid, liquid or gaseous waste materials in the reaction chamber thereby chemically reducing them, said step of applying including applying liquid aluminum to effect reduction;

(c) adjusting the temperature of the molten reducing metal so as to reduce the contaminated radioactive elements, and to vaporize the volatile radioactive elements;

(d) removing at least a portion of unreacted molten metal including the radioactive elements and the reaction products of reacted waste materials including the non-volatile radioactive elements as either a slag component or an alloyed component from the reaction chamber so as to allow them to solidify, thereby producing a substantially less hazardous final product which is easily and safely disposable in a significantly smaller space than that occupied by the original wastes;

(e) removing contaminated reacted or unreacted gases from the reaction chamber; and

(f) trapping the volatile radioactive metals.