The response surface design was established in central composite design by using Minitab software version 16.0.2 (Minitab Inc.), within the collected responses of pH and TSS values as shown inTable 1.
The response surface design was established in centralcomposite design by using Minitab software version 16.0.2(Minitab Inc.), within the collected responses of pH and TSSvalues as shown inTable 1.