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Table 4 Analysis of variance (ANOVA) for BOD5/COD

From: Improved biodegradability of hardly-decomposable wastewaters from petrochemical industry through photo-Fenton method and determination of optimum operational conditions by response surface methodology

Source SUM of Square Degree of Freedom Mean Square F Value P- Value Prob > F  
Model 0.34 7 0.049 151.26 <0.0001 significant
A-COD 0.17 1 0.17 520.54 <0.0001  
B-H2O2 0.10 1 0.10 319.78 <0.0001  
C-Fe2+ 0.042 1 0.042 130.14 <0.0001  
BC 1.087E-003 1 1.087E-003 3.36 0.0732  
A2 9.264E-003 1 9.264E-003 28.65 <0.0001  
B2 6.679E-003 1 6.679E-003 20.66 <0.0001  
C2 5.226E-003 1 5.226E-003 16.16 0.0002  
Residual 0.015 46 3.233E-004    
Lack of Fit 7.308E-003 17 4.299E-004 1.65 0.1149 not significant
Pure Error 7.565E-003 29 2.608E-004    
Cor Total 0.36 53     
R2 = 95.84%       
\( {R}_{adj}^2=95.20\% \)