Table 1.
Experimental range and levels of independent variables
| Independent variables | Design variables | Range and levels | ||
|---|---|---|---|---|
| −1 | 0 | 1 | ||
| pH | A | 4 | 6 | 8 |
| NaHCO3 (g/l) | B | 3.33 | 6.66 | 10 |
| Inoculum size (%) | C | 10 | 20 | 30 |
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