Abstract
The denitration of highly radioactive liquid waste and intermediate level liquid waste with formaldehyde have been investigated. A number of different simulated solutions as well as real waste from fuel reprocessing have been used in cold laboratory experiments and in hot experiments performed with the FIPS II denitrator. Partial or exhaustive reduction of nitric acid can be achieved in a simple and safe way feeding formaldehyde into the boiling acidic batch or by simultaneous feeding of acidic waste and formaldehyde generating mainly NO.
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