Table 2 Performance of up-flow anaerobic fixed film fixed bed reactor (UAnFFFBR) in removing DEP

Influent DEP concentration (mg L⁻¹)

300

300

300

300

300

400

500

600

700

HRT (h)

12

18

24

30

36

36

36

36

36

L _org (g COD m⁻² day⁻¹)

4.162

2.775

2.081

1.665

1.387

1.85

2.312

2.775

3.237

Attached mass [TS (mg) of biofilm]

5840

4370

4110

3880

3720

4340

5440

6080

6840

Attached mass [VS (mg) of biofilm]

4080

2940

2700

2460

2280

2880

3660

4320

4980

VS/TS ratio

0.698

0.672

0.657

0.634

0.613

0.663

0.672

0.71

0.728

Effluent total suspended solids (mg day⁻¹)

326.8

227.3

169.3

129.6

112.2

144.5

181.4

220

270

Effluent volatile suspended solids (mg day⁻¹)

164.4

102.4

74.4

55.7

48

76.8

96

117.6

151.8

DEP concentration in TSS_e (mg g⁻¹)

9.7

9.3

8.6

8.1

5.2

7.4

7.5

8.4

9.1

SRT (day)

17.87

19.22

24.27

29.94

33.15

30.03

29.98

27.63

25.33

Methane production (L/g COD_rem)

0.22 (0.2)

0.24 (0.22)

0.28 (0.26)

0.34 (0.31)

0.42 (0.38)

0.34 (0.31)

0.32 (0.29)

0.30 (0.27)

0.27 (0.24)

Methane percentage (%)

41.1

42.3

52.8

56.1

61.5

61.0

59.5

59.6

57.3

DEP removal (%)

67.9

72.5

76.46

80.96

87.86

88.15

88.3

88.36

88.72

COD removal (%)

57.91

60.86

71.85

78.79

83.55

84.25

86.02

86.27

86.91

TOC removal (%)

45.32

53.97

62.58

70.05

78.33

78.34

78.25

78.79

79.65