Research Article
Performance Optimization of Chemical and Green Coagulants in Tannery Wastewater Treatment: A Response Surface Methodology Approach
Table 4
Central composite design matrix for coagulation experiments with aluminum sulphate coagulants.
| Run order | Independent variables | Responses | Alum dosage (X1) (g/L) | pH, X2 | COD removal, (%) | TSS removal, (%) | SVI, (mL/g) |
| 1 | 16 | 8.5 | 36.91 | 71.07 | 35.09 | 2 | 17.66 | 7.5 | 32.30 | 69.52 | 27.97 | 3 | 12 | 6.09 | 39.22 | 76.03 | 29.26 | 4 | 12 | 7.5 | 32.34 | 73.89 | 30.23 | 5 | 12 | 7.5 | 30.18 | 72.78 | 29.84 | 6 | 12 | 7.5 | 31.97 | 73.01 | 30.39 | 7 | 12 | 7.5 | 32.22 | 72.94 | 30.03 | 8 | 16 | 6.5 | 33.47 | 71.59 | 27.41 | 9 | 12 | 7.5 | 30.29 | 73.78 | 29.95 | 10 | 6.34 | 7.5 | 20.81 | 73.32 | 35.95 | 11 | 12 | 8.91 | 34.10 | 74.05 | 45.46 | 12 | 8 | 6.5 | 30.92 | 75.53 | 31.05 | 13 | 8 | 8.5 | 21.97 | 73.12 | 45.04 |
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