Decontamination aqueous raffinate stream

The flowsheet has three aqueous effluents. The first is the decontaminated aqueous raffinate stream. For economic reasons, entrained solvent in the raffinate must be recovered test results show that coalescers are practical and effective [89], In the baseline SWPF, the raffinate stream will be transferred to the Saltstone Facility, where it will be disposed of in a cementitious low-activity waste form called saltstone. The... 

During the decontamination steps, acid streams containing small amounts of actinides and fission products are produced. These streams are evaporated to concentrate the metal ions and recycle them. Nitric acid is recovered from the condensates and recycled. Excess HNO3 may be destroyed by formaldehyde. Fission product concentrates are routed to the aqueous raffinate of the first extractor of the partitioning cycle which contains > 99% of the FP. This constitutes the high level liquid waste (HLLW, or alternatively called HAW, high active waste). All other liquid wastes can be subdivided into intermediate level waste... 

Despite the success of the counter-current process in comparison with single batch or crosscurrent processes, a DFl value of 10 is modest in view of the hundredfold difference between and. Better decontamination can be achieved if a washing or scrub section is incorporated in the process. This involves contacting the loaded organic product stream with an aqueous phase having a low or zero Ln concentration. The raffinate from this section is then combined with the aqueous feed to the extraction section, as illustrated in Figure 31. The mass fraction, of... 

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