Tank waste remediation system optimized processing strategy with an altered treatment scheme

Abstract

treatment scheme performs t h e major elements o f t h e TWRS Program, b u t m o d i f i e s t h e deployment o f selected treatment technologies t o reduce t h e program cost. The present program f o r development o f waste r e t r i e v a l , pretreatment, and v i t r i f i c a t i o n techno1 ogi es continues, b u t t h e optimized processing s t r a t e g y reuses a s i n g l e f a c i l i t y t o accomplish t h e separations/low-activi t y waste (LAW) v i t r i f i c a t i o n and t h e high-level waste (HLW) v i t r i f i c a t i o n processes sequentially, thereby e l i m i n a t i n g t h e need f o r a separate HLW v i t r i f i c a t i o n f a c i l i t y. TRADEMARK DISCLAIMER. trade name, trademark, manufacturer, or otherwise. does not necessarily constitute or i n p l y i t s Ndorsanent, recnnmdaticn, or favoring by the United States Goverlmnt or any agency thereof o r i t s contractors or subcontractors.

Technical basis for classification of low-activity waste fraction from Hanford site tanks

“…The addition of technetium removal to a volatilization system requires neutralization with sodium hydroxide and addition of sodium sulfide to the scrubber concentrate for technetium precipitation as Tc,S,. The FY 1995 flowsheet for TWRS Optimized Processing Strategy (Slaathaug 1996a) shows NaOH and Na,S are added to the concentrate and before filtration for separation of the technetium sulfide. The technetium depleted filtrate is recycled to the melter feed tank.…”