Solidification of HyBRID waste using geopolymer waste form

The target radionuclides such as Cobalt and Cesium are separated through HyBRID process from the primary system decontamination and subsequently present in HyBRID wastewater containing high contents of sulfate ion. This HyBRID wastewater is then converted to HyBRID sludge waste through a precipitation process. The HyBRID sludge, which has the high contents of sulfate ion, makes cement waste form defective due to the potential formation of Ettringite mineral [Ca₆Al₂(SO₄)₃(OH)₁₂·26H₂O] [1]. Therefore, the geopolymer waste form was proposed to immobilize the HyBRID sludge waste with the waste loading (>10%). Geopolymer waste form was proposed to immobilize the HyBRID sludge waste with high sulfate content. Geopolymer waste forms with HyBRID sludge have met the acceptance criteria. The compressive strength of the geopolymer waste forms was 37.95MP with 16 wt% of HyBRID sludge. The FT-IR result revealed the presence of residual amorphous silica at low Si/Al ratio (Si/Al=1.7).