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Table 3

Design matrix by CCD, and the actual and predicted percentage TOC degradation for response surface quadratic model

Run numberCoded levels
Actual levels
TOC removal (%)
X1X2X3[H2O2]0 (M)GAC dosage (g/L)[IPA]0 (M)ObservedPredicted
−1 −1 −1 0.2 60 0.18 63.18 64.69 
+1 −1 −1 0.4 60 0.18 58.74 61.14 
−1 +1 −1 0.2 120 0.18 84.83 90.29 
−1 −1 +1 0.2 60 0.60 45.69 46.15 
+1 +1 −1 0.4 120 0.18 81.16 86.87 
+1 −1 +1 0.4 60 0.60 41.57 42.28 
−1 +1 +1 0.2 120 0.60 62.87 66.64 
+1 +1 +1 0.4 120 0.60 58.24 62.90 
−1.682 0.132 90 0.39 65.34 69.60 
10 +1.682 0.468 90 0.39 60.55 63.47 
11 −1.682 0.3 39.54 0.39 39.39 39.91 
12 +1.682 0.3 140.46 0.39 70.18 78.77 
13 −1.682 0.3 90 0.038 85.17 87.14 
14 +1.682 0.3 90 0.743 46.29 51.49 
15 0.3 90 0.39 61.54 64.43 
16 0.3 90 0.39 60.89 64.43 
17 0.3 90 0.39 61.34 64.43 
18 0.3 90 0.39 61.58 64.43 
19 0.3 90 0.39 62.11 64.43 
20 0.3 90 0.39 60.75 64.43 
Run numberCoded levels
Actual levels
TOC removal (%)
X1X2X3[H2O2]0 (M)GAC dosage (g/L)[IPA]0 (M)ObservedPredicted
−1 −1 −1 0.2 60 0.18 63.18 64.69 
+1 −1 −1 0.4 60 0.18 58.74 61.14 
−1 +1 −1 0.2 120 0.18 84.83 90.29 
−1 −1 +1 0.2 60 0.60 45.69 46.15 
+1 +1 −1 0.4 120 0.18 81.16 86.87 
+1 −1 +1 0.4 60 0.60 41.57 42.28 
−1 +1 +1 0.2 120 0.60 62.87 66.64 
+1 +1 +1 0.4 120 0.60 58.24 62.90 
−1.682 0.132 90 0.39 65.34 69.60 
10 +1.682 0.468 90 0.39 60.55 63.47 
11 −1.682 0.3 39.54 0.39 39.39 39.91 
12 +1.682 0.3 140.46 0.39 70.18 78.77 
13 −1.682 0.3 90 0.038 85.17 87.14 
14 +1.682 0.3 90 0.743 46.29 51.49 
15 0.3 90 0.39 61.54 64.43 
16 0.3 90 0.39 60.89 64.43 
17 0.3 90 0.39 61.34 64.43 
18 0.3 90 0.39 61.58 64.43 
19 0.3 90 0.39 62.11 64.43 
20 0.3 90 0.39 60.75 64.43 
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