Run Experimental Design                                           Results
Dosage    pH PFS PFPD1 PFPD2 PFPD3
(X1) (X2) Y1 Y2 Y1 Y2 Y1 Y2 Y1 Y2
1 390 7.5 66.48 66.94 65.98 66.64 72.49 73.23 68.51 67.06
2 390 7.5 67.03 66.94 67.01 66.64 73.02 73.23 67.96 67.06
3 390 6.5 63.19 ; 63.98 59.79 60.32 58.20 58.74 56.35 56.39
4 430 8 64.29 64.61 64.43 64.94 72.49 71.06 64.09 64.21
5 350 8 64.84 65.16 62.89 63.91 77.78 75.47 62.43 62.74
6 390 7.5 67.58 66.94 67.53 66.64 74.60 73.23 69.61 67.06
7 430 7 68.13 67.18 65.46 64.76 68.78 67.88 62.98 63.84
8 350 7 64.29 63.33 64.43 64.25 70.37 68.59 60.77 61.26
9 390 7.5 67.58 66.94 65.98 66.64 71.96 73.23 68.51 67.06
10 390 8.5 63.74 63.25 60.82 60.14 67.72 68.79 59.12 58.23
11 310 7.5 60.99 61.15 63.92 63.58 74.07 75.32 58.01 58.60
12 390 7.5 65.38 66.94 67.01 66.64 70.90 73.23 69.06 67.06
13 470 7.5 64.29 64.44 64.95 65.13 69.84 70.20 63.54 62.65
Y1 is the measured COD removal efficiency; Y2 is predicted COD removal efficiency.
Table 3: Experimental design and results obtained (observed and predicted COD removal efficiency (%)).