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Experimental domin and levels of independent parameters for response surface methodology.
| Factor | Unit | Alpha | -1 | 0 | 1 | Alpha |
|---|---|---|---|---|---|---|
| Carbon source | g L−1 | 10 | 20 | 30 | 40 | 50 |
| Nitrogen source | g L−1 | 10 | 20 | 30 | 40 | 50 |
| pH | 6 | 7 | 8 | 9 | 10 | |
| Bacterial concentration | ml L−1 | 10 | 20 | 30 | 40 | 50 |
