Foaming and Antifoaming in Radioactive Waste Pretreatment and Immobilization Processes Page: 3 of 28
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Savannah River National Laboratory (SRNL) has reported severe foaminess in the
bench scale evaporation of the Hanford River Protection - Waste Treatment Plant
(RPP-WPT) envelope C waste. Excessive foaming in waste evaporators can cause
carryover of radionuclides and non-radioactive waste to the condensate system.
The antifoams used at Hanford and tested by SRNL are believed to degrade and
become inactive in high pH solutions. Hanford wastes have been known to foam
during evaporation causing excessive down time and processing delays.
Experimental and theoretical investigations of the surface phenomena, suspension
rheology, and bubble generation and interactions that lead to the formation of
foam during waste processing were pursued under this EMSP project. The first
major task accomplished in the grant period involved establishment of the main
mechanisms of formation and stabilization of foams containing very small
insoluble particles, since the radioactive waste foams are typically stabilized by
such particles. The results of this research were published in a series of papers
(See Publications 1-12). Fundamental research into the particle structuring
phenomena in the confined boundaries of a film also lead unexpectedly to a new
mechanism for soil remediation (See Publication 7).
The second major task involved an investigation of the major mechanisms of
antifoaming of foams stabilized by solid particles. Based on the mechanistic
understanding of the antifoaming action in solid particle-stabilized foams, and
working closely with SRNL, we have successfully developed and tested antifoam
agent IIT-B52 to mitigate foaming in a process originally developed for the
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Wasan, Darsh T.; Nikolov, Alex D.; Lamber, D.P.; Calloway, T. Bond & Stone, M.E. Foaming and Antifoaming in Radioactive Waste Pretreatment and Immobilization Processes, report, March 12, 2005; United States. (https://digital.library.unt.edu/ark:/67531/metadc780348/m1/3/: accessed March 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.