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Composition and process for the encapsulation and stabilization of radioactive, hazardous and mixed wastes

Patent ·
OSTI ID:871445
 [1];  [2]
  1. Wading River, NY
  2. Patchogue, NY
+ Show Author Affiliations

The present invention provides a composition and process for disposal of radioactive, hazardous and mixed wastes. The present invention preferably includes a process for multibarrier encapsulation of radioactive, hazardous and mixed wastes by combining substantially simultaneously dry waste powder, a non-biodegradable thermoplastic polymer and an anhydrous additive in an extruder to form a homogenous molten matrix. The molten matrix may be directed in a "clean" polyethylene liner, allowed to cool, thus forming a monolithic waste form which provides a multibarrier to the dispersion of wastes into the environment.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY
DOE Contract Number:
AC02-76CH00016
Assignee:
Associated Universities, Inc. (Washington, DC)
Patent Number(s):
US 5732364
Application Number:
08/781003
OSTI ID:
871445
Country of Publication:
United States
Language:
English

References (6)

Polyethylene encapsulatin of nitrate salt wastes: Waste form stability, process scale-up, and economics report July 1991
Thermoplastic Encapsulation Treatability Study for a Mixed Waste Incinerator Off-Gas Scrubbing Solution book
Long-Term Durability of Polyethylene for Encapsulation of Low-Level Radioactive, Hazardous, and Mixed Wastes book February 1993
Polyethylene solidification of low-level wastes report February 1985
Polyethylene encapsulation of single-shell tank low-level wastes. Annual progress report report September 1992
Polyethylene encapsulation of single-shell tank low-level wastes. FY-93 interim progress report report June 1993

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/588/264/976/
additive
allowed
anhydrous
anhydrous additive
clean
combining
combining substantially
composition
cool
directed
dispersion
disposal
dry
dry waste
encapsulation
environment
extruder
form
forming
hazardous
homogenous
homogenous molten
liner
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mixed
mixed waste
mixed wastes
molten
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monolithic
monolithic waste
multibarrier
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non-biodegradable
non-biodegradable thermoplastic
plastic polymer
polyethylene
polyethylene liner
polymer
powder
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process
provides
radioactive
simultaneously
simultaneously dry
stabilization
substantially
substantially simultaneous
substantially simultaneously
thermoplastic
thermoplastic polymer
waste
waste form
waste powder
wastes