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Table 3 Performance data for control and upgrading reactors at different experimental phases (mean  ±  SD)

From: Impact of operational conditions on methane yield and microbial community composition during biological methanation in in situ and hybrid reactor systems

Phases

I

II

III

IV

V

VI

Reactor

CR

UR

CR

UR

CR

UR

CR

UR

CR

UR

CR

UR

Biogas yield (mL g−1VS)

244.72  ±  8.29

241.15  ±  11.01

245.59  ±  4.52

298.11  ±  4.84

232.47  ±  4.16

218.43  ±  9.70

263.18  ±  7.16

349.90  ±  3.81

231.00  ±  4.49

305.43  ±  2.55

205.68  ±  6.18

246.00  ±  4.65

CH4 yield (mL g−1VS)

144.77  ±  2.38

143.50  ±  3.95

146.34  ±  2.25

185.44  ±  1.94

133.52  ±  2.22

132.96  ±  5.20

142.19  ±  1.83

204.15  ±  1.48

141.70  ±  6.05

193.79  ±  4.24

134.03  ±  2.58

164.60  ±  2.95

Gas compositions (%)

            

 CH4

58.24  ±  1.09

59.14  ±  1.25

59.88  ±  0.66

39.97  ±  0.60

57.57  ±  0.13

40.76  ±  0.45

53.70  ±  0.36

38.69  ±  0.38

58.55  ±  0.50

42.58  ±  0.59

56.10  ±  1.55

38.65  ±  0.77

 CO2

41.76  ±  1.09

40.86  ±  1.25

40.41  ±  0.68

28.59  ±  0.59

42.43  ±  0.13

26.19  ±  0.14

46.30  ±  0.36

28.04  ±  0.44

41.45  ±  0.50

23.13  ±  0.51

43.90  ±  1.55

19.11  ±  0.24

 H2

–

–

–

31.44  ±  0.15

–

33.05  ±  0.31

–

33.27  ±  0.11

–

34.29  ±  0.08

–

42.24  ±  0.83

H2 consumption (%)

–

–

–

24.96  ±  0.09

–

45.99  ±  0.36

–

17.35  ±  0.70

–

31.80  ±  1.12

–

53.85  ±  2.71

pH

7.92  ±  0.02

7.94  ±  0.01

7.94  ±  0.01

8.10  ±  0.01

8.15  ±  0.07

8.28  ±  0.03

7.91  ±  0.03

8.11  ±  0.03

7.82  ±  0.06

8.04  ±  0.05

7.77  ±  0.02

7.95  ±  0.08

TVFA (mM)

18.99  ±  5.33

17.12  ±  5.37

30.73  ±  3.68

44.55  ±  0.36

30.56  ±  0.45

66.63  ±  9.85

37.67  ±  2.29

62.18  ±  7.42

40.18  ±  5.06

65.08  ±  3.28

36.66  ±  1.89

98.14  ±  5.50

AA (mM)

12.04  ±  4.02

12.07  ±  4.71

20.58  ±  1.91

35.68

18.32  ±  1.68

53.50  ±  9.05

20.57  ±  2.97

45.83  ±  9.10

25.59  ±  3.66

50.01  ±  2.19

24.87  ±  0.79

80.63  ±  5.54

PA (mM)

6.95  ±  1.31

5.05  ±  0.66

10.15  ±  1.77

8.87  ±  0.36

12.24  ±  1.23

13.13  ±  0.95

17.10  ±  0.67

16.36  ±  1.67

14.58  ±  1.59

15.07  ±  1.56

11.79  ±  1.10

17.51  ±  0.04

TAN (g L−1)

2.48  ±  0.06

2.52  ±  0.02

2.57  ±  0.01

2.77  ±  0.16

3.32  ±  0.22

2.88  ±  0.14

3.12  ±  0.11

3.17  ±  0.03

2.80  ±  0.15

2.89  ±  0.09

2.65  ±  0.11

2.80  ±  0.07

  1. CR control reactor; UR in situ upgrading reactor; TVFA total volatile fatty acid; AA acetic acid; PA propionic acid