Research Article
Performance Optimization of Chemical and Green Coagulants in Tannery Wastewater Treatment: A Response Surface Methodology Approach
Table 6
Analysis of variance for response surface model for %COD removal (
), %TSS removal (
), and SVI (
) with aluminum sulphate.
| Term | d.f | F-value | value | | | | | | |
| Model | 5 | 66.2 | 33.6 | 572 | ≤0.001 | ≤0.001 | ≤0.001 | | 1 | 112 | 9.63 | 164 | ≤0.001 | 0.017 | ≤0.001 | | 1 | 61.8 | 14.4 | 611 | ≤0.001 | 0.007 | ≤0.001 | | 1 | 55.7 | 36.1 | 40.3 | ≤0.001 | ≤0.001 | ≤0.001 | | 1 | 52.1 | 20.7 | 612 | ≤0.001 | 0.003 | ≤0.001 | | 1 | 41.9 | 4.36 | 66.3 | ≤0.001 | 0.075 | ≤0.001 | Lack-of-fit | 3 | 0.53 | 0.47 | 5.77 | 0.688 | 0.720 | 0.062 |
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