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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%

      

\( {R}_{adj}^2=95.20\% \)