Research Article
Application of Response Surface Methodology to Enhance Phenol Removal from Refinery Wastewater by Microwave Process
Table 4
ANOVA test for the phenol removal efficiency.
| | Source | Sum of squares | df | Mean square | Value | value
Prob > |
| | Model | 5564.95 | 20 | 278.25 | 4.23 | 0.0002 | | 0.34 | 1 | 0.34 | | 0.9430 | | 1107.51 | 1 | 1107.51 | 16.84 | 0.0003 | | 9.21 | 1 | 9.21 | 0.14 | 0.7109 | | 1483.81 | 1 | 1483.81 | 22.56 | <0.0001 | | 1498.65 | 1 | 1498.65 | 22.79 | <0.0001 | | 122.19 | 1 | 122.19 | 1.86 | 0.1833 | | 8.18 | 1 | 8.18 | 0.12 | 0.7268 | | 7.61 | 1 | 7.61 | 0.12 | 0.7362 | | 14.11 | 1 | 14.11 | 0.21 | 0.6466 | | 59.17 | 1 | 59.17 | 0.90 | 0.3507 | | 0.91 | 1 | 0.91 | 0.014 | 0.9071 | | 19.16 | 1 | 19.16 | 0.29 | 0.5935 | | 67.63 | 1 | 67.63 | 1.03 | 0.3189 | | 121.29 | 1 | 121.29 | 1.84 | 0.1849 | | 2.14 | 1 | 2.14 | 0.033 | 0.8580 | | 37.24 | 1 | 37.24 | 0.57 | 0.4578 | | 4.58 | 1 | 4.58 | 0.070 | 0.7938 | | 5.78 | 1 | 5.78 | 0.088 | 0.7690 | | 313.38 | 1 | 313.38 | 4.77 | 0.0373 | | 140.03 | 1 | 140.03 | 2.13 | 0.1552 | | Residual | 1907.00 | 29 | 65.76 | | | | Lack of fit | 1850.33 | 22 | 84.11 | 10.39 | 0.0020 | | Pure error | 56.67 | 7 | 8.10 | | | |
Cor total | 7471.95 | 49 | | | |
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, Adeq Precision = 8.475.
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