Table 3 Experimental design with response surface methodology and the results
No. | Input Variables | Results | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Methane Production | Microbial | |||||||||
Temp. (°C) | pH | H2O2 concentration (mg/ g TS) | Cumulative MP (mL/ g VS) | Increase MP (%) | COD Solubilization (%) | Increase of sCOD (g/L) | Decrease of VSS (g/L) | Increase of Protein (g/L) | Increase of Polysaccharide (g/L) | |
1 | 25 | 8 | 0 | 314 | 0 | 3.65 | 2.32 | 1.95 | 0.52 | 0.01 |
2 | 25 | 8 | 30 | 373 | 18.79 | 8.09 | 5.14 | 5.11 | 0.95 | 0.03 |
3 | 25 | 8 | 60 | 358 | 14.01 | 9.05 | 5.75 | 4.25 | 1.35 | 0.04 |
4 | 25 | 10 | 30 | 410 | 30.57 | 18.67 | 11.86 | 10.61 | 2.16 | 0.27 |
5 | 25 | 10 | 60 | 426 | 35.67 | 18.97 | 12.05 | 12.24 | 2.53 | 0.22 |
6 | 25 | 12 | 0 | 444 | 41.4 | 14.56 | 9.25 | 8.67 | 1.66 | 0.17 |
7 | 25 | 12 | 60 | 471 | 50 | 22.59 | 14.35 | 13.88 | 2.94 | 0.18 |
8 | 75 | 8 | 30 | 402 | 28.02 | 16.72 | 10.62 | 10.98 | 1.68 | 0.22 |
9 | 75 | 8 | 30 | 415 | 32.17 | 16.34 | 10.38 | 11.21 | 1.84 | 0.2 |
10 | 75 | 10 | 30 | 480 | 52.67 | 21.67 | 13.76 | 14.35 | 2.87 | 0.38 |
11 | 75 | 10 | 30 | 469 | 49.36 | 21.82 | 13.86 | 14.51 | 2.46 | 0.34 |
12 | 75 | 10 | 30 | 488 | 55.41 | 21.56 | 13.69 | 14.2 | 2.81 | 0.28 |
13 | 75 | 10 | 60 | 506 | 61.15 | 23.43 | 14.88 | 15.72 | 2.97 | 0.33 |
14 | 75 | 10 | 60 | 502 | 59.87 | 23.51 | 14.93 | 15.99 | 3.02 | 0.23 |
15 | 75 | 12 | 0 | 492 | 56.69 | 17.86 | 11.34 | 12.01 | 2.39 | 0.17 |
16 | 90 | 8 | 0 | 418 | 33.12 | 15.24 | 9.68 | 8.08 | 2.14 | 0.18 |
17 | 90 | 8 | 60 | 524 | 66.88 | 22.17 | 14.08 | 15.64 | 2.85 | 0.31 |
18 | 90 | 10 | 0 | 479 | 52.55 | 21.1 | 13.4 | 14.55 | 2.74 | 0.36 |
19 | 90 | 12 | 30 | 615 | 95.86 | 30.37 | 19.29 | 19.47 | 3.81 | 0.52 |
20 | 90 | 12 | 30 | 621 | 97.77 | 30.17 | 19.16 | 19.71 | 3.91 | 0.59 |