(107d) Pilot-Scale Testing of Solid-Liquid Mixing for Radioactive Waste Treatment

The Savannah River Site (SRS) is developing processes to treat radioactive liquid waste in million gallon waste tanks. In one of these processes, salt solution containing entrained solids is added to a waste tank. The process then adds monosodium titanate (MST) to the process to sorb strontium and select actinides. The tank is mixed with rotating jet pumps. Following the sorption process, the salt solution is filtered to remove the solid particles and processed through an ion exchange process to remove cesium.

The authors designed and constructed a nominal 1/10 scale tank to evaluate the process and size the pumps. The testing will determine the pump flow rate to mix the MST, so the sorption process is complete, the mixing time required for sorption, and the pump flow rate needed to suspend solid particles that settle in the tank for extended durations at elevated temperatures.

The authors will discuss the test results.