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Plackett–Burman design for the evaluation of significant variables affecting Cr6+ removal by S. rochei ANH.
| Trials | X1 | X2 | X3 | X4 | X5 | X6 | X7 | Cr6+ removal (%) |
|---|---|---|---|---|---|---|---|---|
| 1 | + 1 | -1 | -1 | + 1 | -1 | + 1 | + 1 | 15.30 |
| 2 | + 1 | + 1 | -1 | -1 | + 1 | -1 | + 1 | 13.10 |
| 3 | + 1 | + 1 | + 1 | -1 | -1 | + 1 | -1 | 41.80 |
| 4 | -1 | + 1 | + 1 | + 1 | -1 | -1 | + 1 | 42.00 |
| 5 | + 1 | -1 | + 1 | + 1 | + 1 | -1 | -1 | 0 |
| 6 | -1 | + 1 | -1 | + 1 | + 1 | + 1 | -1 | 25.50 |
| 7 | -1 | -1 | + 1 | -1 | + 1 | + 1 | + 1 | 38.70 |
| 8 | -1 | -1 | -1 | -1 | -1 | -1 | -1 | 47.40 |
