A study on the roll compaction of dry concentrated waste liquid for disposal

The roll compaction process can be used to reduce the physical volume of the powdered wastes. And polymer solidification technology can be used to manufacture polymer-solidified body incorporated with high-density pellets. Powdered wastes (soil, crushed concrete, dry concentrated waste liquid) were converted to rigid pellets of certain shape and size (H 6.5 center dot W 9.4 mm) by a lab-scale roll compactor. At this time, the operation parameters (hydraulic pressure, roll rotation speed, feeding speed, roll gap) of the roll compactor were evaluated, and the optimal operating conditions of the device were selected by wastes. Subsequently, the volume reduction factor of each powder and solidified body were estimated. Finally, the characterization of the polymer-solidified body incorporated with pellets was performed to confirm that they met the waste acceptance criteria of the radioactive waste repository.