Experiment

Factor A

Factor B

Factor C

Factor D

COD removal

Number

%

1

1

1

1

1

52.5

2

1

2

2

2

82.2

3

1

3

3

3

18.2

4

2

1

2

3

79.1

5

2

2

3

1

69.0

6

2

3

1

2

62.1

7

3

1

3

2

83.8

8

3

2

1

3

82.7

9

3

3

2

1

42.9

K1

152.9

215.4

197.3

164.4

K2

210.2

233.9

204.2

228.1

K3

209.4

123.2

171

180

k1

51

71.8

65.8

54.8

k2

70.1

78

68.1

76

k3

69.8

41.1

57

60

R

19.1

36.9

11.1

21.2