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Bulletin of the National Research Centre

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

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