Table 7. Cost of reagents used for the remediation of Cr-contaminated soil alongside their optimized dosage.
| Stabilization recipe | Reagent dosage (%) | Fly ash (%) | Lime (%) | Cost of reagent used/kg (in USD) |
|---|---|---|---|---|
| Ferrous sulphate mix | 59.77 | 28.13 | 30.00 | FeSO4: 0.084; cement: 0.086; fly ash: 0.0090; lime: 0.060; sulphuric acid (H2SO4): 0.17 |
| Sodium sulphide mix | 9.00 | 31.06 | 30.00 | Na2S: 0.37; cement: 0.086; fly ash: 0.0090; lime: 0.060; sulphuric acid (H2SO4): 0.17 |
| Sodium thiosulphate mix | 3.02 | 35.00 | 29.19 | Na2S2O3: 0.26; cement: 0.086; fly ash: 0.0090; lime: 0.060; sulphuric acid (H2SO4): 0.17 |
| Sodium metabisulphite mix | 5.00 | 25.00 | 28.38 | Na2S2O5: 0.30; cement: 0.086; fly ash: 0.0090; lime: 0.060; sulphuric acid (H2SO4): 0.17 |
| Sodium sulphite mix | 24.96 | 25.50 | 30.00 | Na2SO3: 0.44; cement: 0.086; fly ash: 0.0090; lime: 0.060; sulphuric acid (H2SO4): 0.17 |