Table 2 Experimental ranges and levels of the process parameters used in the Box–Behnken design.

From: Process modeling of municipal solid waste compost ash for reactive red 198 dye adsorption from wastewater using data driven approaches

Variable

Symbol

− 1

0

+ 1

pH

X1

3

7

11

Contact time(min)

X2

20

50

80

MSW compost ash dosage (g)

X3

0.5

1.25

2

RR198 concentration (mg L−1)

X4

20

60

100

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