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

Patent ·
OSTI ID:872400
 [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 (United States)
DOE Contract Number:
AC02-76CH00016
Assignee:
Brookhaven Science Associates LLC (Upton, NY)
Patent Number(s):
US 5926772
Application Number:
08/950023
OSTI ID:
872400
Country of Publication:
United States
Language:
English

References (6)

Polyethylene solidification of low-level wastes report February 1985
Polyethylene encapsulation of single-shell tank low-level wastes. Annual progress report report September 1992
Long-Term Durability of Polyethylene for Encapsulation of Low-Level Radioactive, Hazardous, and Mixed Wastes book February 1993
Equipment evaluation for low density polyethylene encapsulated nitrate salt waste at the Rocky Flats Plant report August 1993
Polyethylene encapsulation of single-shell tank low-level wastes. FY-93 interim progress report report June 1993
Polyethylene encapsulatin of nitrate salt wastes: Waste form stability, process scale-up, and economics report July 1991

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composition
process
encapsulation
stabilization
radioactive
hazardous
mixed
wastes
provides
disposal
preferably
multibarrier
combining
substantially
simultaneously
dry
waste
powder
non-biodegradable
thermoplastic
polymer
anhydrous
additive
extruder
form
homogenous
molten
matrix
directed
clean
polyethylene
liner
allowed
cool
forming
monolithic
dispersion
environment
molten matrix
monolithic waste
waste form
mixed waste
mixed wastes
substantially simultaneously
thermoplastic polymer
multibarrier encapsulation
simultaneously dry
waste powder
anhydrous additive
polyethylene liner
non-biodegradable thermoplastic
combining substantially
dry waste
homogenous molten
substantially simultaneous
plastic polymer
/588/250/264/976/