solidification of wastes with nochaR's polymers
High Technology Engineered Polymers
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N910 polymer, applied to all organic liquids - Thermoplastic elastomer: styrene block copolymer
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N960 polymer, applied to all aqueous liquids - 100% cross linked, co-polymer of acrylamide
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N935 polymer, applied to light alcohols
Thus the choice of the NOCHAR polymer to be used depends on the nature of the effluent to be immobilized, alone or as a mixture.
IMPLEMENTATION
Absorption and solidification of liquid
- Quick reaction
- Slow speed mixing
- Mass ratios "liquid:polymer" vary depending upon the chemical composition of the waste
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- Oil : 1:1 à 3:1
- TBP : 1:1 à 2:1
- Mixed sludge types : 2:1 à 4:1
- Aqueous solutions : 2:1 à 5:1
Minimal volumetric increase in the solidification process: less than 10%
We strongly recommend that each waste stream undergo a bench test, in order to verify the composition of the solution, to determine the best polymer formula for solidification and to determine appropriate and safe solidification ratios, based on liquid : polymer by weight.
ADVANTAGES :
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Stabilized final waste (no degradation), non-leaching and
solid,
- No heat build up, no heat release in the process;
- Non toxic and worker friendly products
- High Resistance to radiation - 2.7 MGray Cobalt 60, gamma source
- If apart from organic liquids, the liquid contains an aqueous phase, a combination of various polymer materials is used
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Disposal options:
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Incineration: Cyclife (France, Sweden) and Belgoprocess (Belgium)
- Encapsulation in cement
- Direct disposal into carbon steel drums or high integrated (HIC) liner then into drums
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Incineration: Cyclife (France, Sweden) and Belgoprocess (Belgium)
Representative Projects since Year 2001
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US Department of Energy, Mound, Ohio
- Pump oil with tritium; 50 000 curies over a 3-year period. Disposal at Nevada NS Site
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US Department of Energy, Mound, Rocky FLats, Colorado
- One of the first nuclear weapons complex to undergo full decommissioning
- All liquid waste contained plutonium
- Methanol solution with organic contaminants
- Mixed organic waste with carbon tetrachloride and trichloroethylene
- Spent pump oil
- Disposal at waste Isolation Pilot Plant (WIPP) for Transuranic waste forms
- France : CEA CADARACHE LOR (organic solutions containing Xylene and TBP) conducted by ORANO DS (previously named AREVA)
LOR sample n°20 - Composition : 13% (xylene, mesitylene, diphenyloxazol, , TBP, ) and 87% water
LOR sample N°75 - Composition : 9,6% TBP and 91,4% water
The polymers N910 and N960 were used to allow obtaining a solidified final waste
These organic liquids solidified by
NOCHAR products were then cemented and accepted on the ANDRA storage site. They were subject to a specific acceptance procedure.
Other return of experience from ORANO : CEA Saclay Tank MA508, CEA Marcoule Tank 64.30, SICN Veurey
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UK Harwell Storage Tube project, remote handled ILW water contamination
- National Award given by the U.K Nuclear Decommissioning Authority in 2015 for Best Innovative technology for SME
- Encapsulated in cement; package in 500 liter drums
- Romania ; Cernavoda NPP; machine oil with tritium, large scale production
Solidification of 30 m3 tritiated oil - transported to Studsvik, Sweden then to Belgoprocess, Belgium for incineration
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other FIELD OF APPLICATION: removal of organic liquid residues froM solid materials
During the operation of the Cernavoda NPP, a series of waste streams have been generated for waste treatment purposes. One important waste stream is the combination of solid materials and liquid organic waste, creating flammable solids. Flammable solids represent solid materials, such as cloth, plastic, contaminated with oil containg gamma nuclides and H-3 from maintenance activities.
The use of
NOCHAR is an effective solution for eliminating the liquid in order to allow the final acceptance of solid and liquid waste.