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Table 1 Matrix for the central composite design (CCD)

From: Application of response surface methodology for color removing from dyeing effluent using de-oiled activated algal biomass

Factors Level
Low (− 1) Central (0) High (+ 1) (− α) (+ α)
D: initial dye concentration (mg/L) 15 32.50 50 3.07 61.93
P: pH 3 6.50 10 0.61 12.39
T: time (min) 30 70 110 2.73 137.27