Table 2.
Five levels and experimental range of independent variables
| Variable | -α | Low | Middle | High | + α |
|---|---|---|---|---|---|
| A- PPMPs size (mm) | 0.25 | 0.85 | 1.45 | 2.05 | 2.65 |
| B- pH | 5 | 6 | 7 | 8 | 9 |
| C- PACl dosage (ppm) | 200 | 400 | 600 | 800 | 1000 |
| D- PAM dosage (ppm) | 10 | 13 | 16 | 19 | 22 |
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