Exp. No. P1 P2 P3 P4 P5 P6 Percentage reduction in COD S/N Ratio
Temp pH F/M DO Time NP T1 T2 T3  
1 25 6 0.5 0.5 14 100:6:1.5 55 60 58 27.2
2 25 6 1 1 16 100:5:1 67 65 67 28.41
3 25 6 1.5 1.5 18 100:4:0.5 57 61 59 29.83
4 25 7 0.5 0.5 16 100:5:1 68 65 72 25.77
5 25 7 1 1 18 100:4:0.5 65 69 71 26.98
6 25 7 1.5 1.5 14 100:6:1.5 59 65 61 26.09
7 30 8 0.5 1 14 100:4:0.5 71 65 69 26.98
8 30 8 1 1.5 16 100:6:1.5 64 67 67 28.6
9 30 8 1.5 0.5 18 100:5:1 71 67 63 24.47
10 30 6 0.5 1.5 18 100:5:1 64 69 72 24.54
11 30 6 1 0.5 14 100:4:0.5 69 71 74 29.04
12 30 6 1.5 1 16 100:6:1.5 64 69 64 27.13
13 35 7 0.5 1 18 100:6:1.5 72 67 70 28.84
14 35 7 1 1.5 14 100:5:1 74 73 76 33.74
15 35 7 1.5 0.5 16 100:4:0.5 58 69 64 21.23
16 35 8 0.5 1.5 16 100:4:0.5 69 71 64 25.5
17 35 8 1 0.5 18 100:6:1.5 72 69 74 29.09
18 35 8 1.5 1 14 100:5:1 65 68 71 27.1
Table 1: Results of trials carried out for different experiments designed using Taguchi approach and their S/N ratios.