Validation of an in situ solidification/stabilization technique for hazardous barium and cyanide waste for safe disposal into a secured landfill.

摘要: Abstract The aim of the present study was to devise and validate an appropriate treatment process for disposal hazardous barium cyanide waste into a landfill at Common Hazardous Waste Treatment Storage Disposal Facility (CHWTSDF). generated during hardening steel components contains (reactive) (toxic) as major contaminants. In chemical fixation contaminants carried out. treated by alkali chlorination with calcium hypochlorite precipitation sodium sulfate sulfate. pretreated mixture then solidified stabilized binding combination slag cement, ordinary Portland cement fly ash, molded blocks (5 × 5 × 5 cm) cured period 3, 7 28 days. final experiments were conducted 18 recipe mixtures waste + additive:binder (W:B) ratios. W:B ratios taken 80:20, 70:30 50:50. optimum proportions additives binders finalized on basis criteria unconfined compressive strength leachability. leachability studies using Toxicity Characteristic Leaching Procedure. analyzed various physical leachable parameters end each curing period. Based results analysis, two mixtures, compositions – 50% [waste + (120 g Ca(OCl)2 + 290 g Na2SO4) kg−1 waste] + 50% binders, validated in situ stabilization secured CHWTSDF.