Evaporation of Pretreated Hanford Tank AW-101 Sample Mixed with Recycle

Crowder, M.L.

Savannah River Site (S.C.)

关键词: Evaporators;    Flowsheets;    Evaporation;    Radioactive Wastes;    Performance Testing;   

DOI  :  10.2172/821690
RP-ID  :  WSRC-TR-2003-00218
RP-ID  :  AC09-96SR18500
RP-ID  :  821690

美国|英语

来源: UNT Digital Library

【 摘 要 】

This task was undertaken to provide validation data for the Treated Feed Evaporator flowsheet and operating conditions using Hanford Tank 241-AW-101 pretreated waste blended with simulated River Protection Project Waste Treatment Plant(RPP-WTP) waste recycles. This task provided the first opportunity to compare performance of blended actual treated waste to the performance of blended treated waste simulants and recycle simulants. Specific objectives were: (1) determining the effect of plant recycles; (2) developing solubility data, as well as chemical and physical property data; and (3) evaluating antifoam effectiveness. The treated AW-101 sample was produced from the composite effluent of Ion Exchange testing carried out at Savannah River Technical Center. The design basis operating conditions were validated. Blended solutions of pretreated Hanford Tank 241-AW-101 and simulated SBS A2 recycle boiled at expected RPP-WTP flowsheet conditions: 60 mm Hg and 50 degrees Celsius. As expected, boiling point increased with concentration. Specifically, the 35:65 blend of AW-101 to SBS A2 at 7.5 M sodium had boiling points of 53 degrees Celsius at 60 mm Hg and 59 degrees Celsius at 80 mm Hg. These were 6 to 7 degrees Celsius higher than those estimated by an OLI model. Precipitation of solids in the AW-101/SBS A2 matrix began between 8.7 M and 10.4 Msodium. No problematic or excessive solids were observed. Therefore, SBS recycles are not expected to have any adverse effect on the evaporation process in the RPP-WTP.