Skip to main content

Table 3 Final yields and productivities of molasses fermentation in terrestrial and marine PBBRs

From: Efficient molasses fermentation under high salinity by inocula of marine and terrestrial origin

PBBR

Fermentation

Methanogenesis

Biomass

COD balance

\(\frac{\text{VFA}_{\text{IN}}}{{\text{COD}}_{\text{IN}}}\)

\(\frac{\text{VFA}_{\text{OUT}}}{{\text{COD}}_{\text{OUT}}}\)

COD to VFAs

YVFA

VFAs prod.

CH4 production

Yields

VSS

Fed

Removed

COD tracked

gCOD L−1 d−1

mL L−1 d−1

gCOD L−1 d−1

\(\text{L}_{\text{CH}_{4}}\) g −1COD removed

gCOD L−1 d−1

gCOD L−1 d−1

gCOD L−1 d−1

%

Terrestrial

 OLR 5

  Mean

1.07

61.1

52.6

79.6

2.47

211.3

0.60

0.341

2.94

4.70

0.62

6.01

127.8

  SD

0.16

4.6

5.6

7.0

0.56

2.6

0.01

 

0.68

0.58

0.22

  

 OLR 10

  Mean

1.38

74.7

66.7

85.8

6.77

362.7

1.04

0.324

3.40

9.82

1.12

11.21

114.2

  SD

0.96

9.6

9.3

8.0

3.15

2.4

0.01

 

1.17

3.42

0.79

  

Marine

 OLR 5

  Mean

0.95

60.8

59.5

102.3

2.36

114.9

0.33

0.280

2.33

4.90

0.41

5.02

102.5

  SD

0.23

7.7

7.2

27.5

0.56

8.0

0.02

 

0.62

2.14

0.32

  

 OLR 10

  Mean

1.20

66.8

60.3

87.8

5.89

299.3

0.86

0.374

3.61

9.80

0.80

10.36

105.7

  1. Mean and standard deviations refer to the last 10 days of operation. Conversion yields were assessed as indicated in Calculations, in “Methods” section. VSS in the effluent were considered as estimates of biomass production. Y VFA is typically higher than COD to VFAs yield as in the former the COD in the outlet not converted to VFAs is not considered. While the former is an indication of the specific microbial activity, the COD to VFAs yield is a process parameter