Table 1 Experimental ranges and levels of independent parameters according to RSM design
Parameters | Symbol | Levels | ||||
|---|---|---|---|---|---|---|
−α | −1 | 0 | +1 | +α | ||
Concentrations of diazinon (mg/L) | A | 0.01 | 2.5 | 5 | 7.5 | 10 |
Reaction time (h) | B | 1 | 8.25 | 15.5 | 22.75 | 30 |
Concentration of S. cerevisiae (%) | C | 0.5 | 1.63 | 2.75 | 3.88 | 5 |
pH | D | 4 | 5.5 | 7 | 8.5 | 10 |