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Table 3 Experimental design with response surface methodology and the results

From: Process optimization and effect of thermal, alkaline, H2O2 oxidation and combination pretreatment of sewage sludge on solubilization and anaerobic digestion

No.Input VariablesResults
Methane ProductionMicrobial
Temp. (°C)pHH2O2 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)
1258031403.652.321.950.520.01
22583037318.798.095.145.110.950.03
32586035814.019.055.754.251.350.04
425103041030.5718.6711.8610.612.160.27
525106042635.6718.9712.0512.242.530.22
62512044441.414.569.258.671.660.17
72512604715022.5914.3513.882.940.18
87583040228.0216.7210.6210.981.680.22
97583041532.1716.3410.3811.211.840.2
1075103048052.6721.6713.7614.352.870.38
1175103046949.3621.8213.8614.512.460.34
1275103048855.4121.5613.6914.22.810.28
1375106050661.1523.4314.8815.722.970.33
1475106050259.8723.5114.9315.993.020.23
157512049256.6917.8611.3412.012.390.17
16908041833.1215.249.688.082.140.18
179086052466.8822.1714.0815.642.850.31
189010047952.5521.113.414.552.740.36
1990123061595.8630.3719.2919.473.810.52
2090123062197.7730.1719.1619.713.910.59