Table 2.
The level of variables
| Variables | Factors | Experimental design (Coded level) | ||||
|---|---|---|---|---|---|---|
| (Coded Xi) | −1.682 | −1 | 0 | +1 | +1.682 | |
| F/I ratio | X1 | 0.5 | 0.7 | 1 | 1.3 | 1.5 |
| Organic loading (gVS L−1) | X2 | 13.18 | 20 | 30 | 40 | 46.82 |
| Initial pH | X3 | 5.32 | 6 | 7 | 8 | 8.68 |
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