Comparative Study for Flue Dust Stabilization in Cement and Glass Materials: A Stability Assessment of Arsenic

Arsenic is a poisonous element and its super mobility can pose major threat to the environment human beings. Disposed arsenic-bearing waste or minerals over time may release arsenic into groundwater, soil then food chain. Consequently, safe landfill deposition should be carried out minimize bleeding. Cement-based stabilization/solidification glass vitrification are two important methods for immobilization. This work compares stability intrinsic leaching properties of sequestered by cement encapsulation smelter high-arsenic flue dust (60% As2O3) confirms if they meet exceed requirement disposition range environmentally relevant conditions. The toxicity characterization procedure (TCLP, 1311), synthetic precipitation (SPLP, 1312) Australian standard (Aus. 4439.3) in short-term (18 h) mass transfer from monolithic material using semi-dynamic tank (1315) longer-term (165 days) were employed assess immobility characteristic three arsenic-cement (2%, 8.4% 14.4%) arsenic-glass (11.7%) samples. Moreover, calcium different matrices has been taken consideration as contributor Based on USEPA guidelines, samples acceptable landfilling only As <5 mg/L. Results obtained almost similar both materials. However, high was observed cement-encapsulated pH leachates after test highly alkaline encapsulated materials; however, it near neutral slightly acidic. Method 1315 tests made huge difference between materials confirmed that not best method due with pH. shown promising results, i.e., insignificant an change value. Overall, sequestration better option compared cement-based solidification process.