Table 1 Performance of anaerobic fixed film baffled reactor (AnFFBR) 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)^a

4.162

2.775

2.081

1.665

1.387

1.85

2.312

2.775

3.237

Attached mass [TS (mg) of biofilm]

6180

4860

4180

3880

3710

4560

5400

6260

7170

Attached mass [VS (mg) of biofilm]

4500

3300

2820

2520

2400

3120

3900

4560

5340

VS/TS ratio

0.728

0.679

0.674

0.649

0.647

0.684

0.722

0.728

0.744

Effluent total suspended solids (mg day⁻¹)

334.3

205

137.7

111.4

90

141.6

168.8

239.5

276.2

Effluent volatile suspended solids (mg day⁻¹)

224.4

130.2

84.5

64.2

48.4

81

98.6

144.3

168.9

DEP concentration in TSS_e (mg g⁻¹)^b

8.5

8.2

6.6

6.2

4.1

7.3

7.5

7.5

7.9

SRT (day)

18.48

23.7

30.35

34.83

41.22

32.2

31.99

26.13

25.96

Methane production (L/g COD_rem)

0.21 (0.19)^c

0.28 (0.25)

0.32 (0.29)

0.37 (0.34)

0.44 (0.4)

0.38 (0.35)

0.35 (0.32)

0.34 (0.31)

0.31 (0.28)

Methane percentage (%)

42.2

44.2

52.5

56.4

64.8

63.3

62.1

61.7

61.1

DEP removal (%)

73.46

78.43

81.4

86.33

90.26

90.62

90.64

90.83

91.11

COD removal (%)

66.66

70.1

77.33

82.29

87.01

88.04

89.48

89.6

90.31

TOC removal (%)

51.82

57.95

66.82

75.7

83.17

83.06

81.90

82.5

82.57