Foaming and Antifoaming in Radioactive Waste Pretreatment and Immobilization Processes [report]

Darsh T Wasan
2002 unpublished Number of graduate student/post-doctoral students involved: 1/2 PROGRESS REPORT RESEARCH OBJECTIVE The objective of this research is to develop a fundamental understanding of the physico-chemical mechanisms that cause foaminess in the DOE High Level (HLW) and Low Activity radioactive waste separation processes and to develop and test advanced antifoam/defoaming agents. Antifoams developed for this research will be tested using simulated defense HLW radioactive wastes
more » ... active wastes obtained from the Hanford and Savannah River sites. RESEARCH PROGRESS AND IMPLICATIONS Savannah River National Laboratory (SRNL) has reported severe foaminess in the bench scale evaporation of the envelope C tank. Excessive foaming in waste evaporates 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. During the third year of this three-year project, experimental and theoretical investigations of the surface phenomena, suspension rheology, and bubble generation interactions that lead to the formation of foams during waste processing were pursued.
doi:10.2172/834760 fatcat:j7gblwa5tbe3bnh63uqoev7xxy