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Table 2 Chemical characterization of the digestate of the methanogenic reactors R1 and R2 during foaming

From: Floating layer formation, foaming, and microbial community structure change in full-scale biogas plant due to disruption of mixing and substrate overloading

 

Two days before foaming

One day after foaming

Five days after foaming

R1

R2

R1

R2

R1

R2

VOA/TIC (-)

0.093 ± 0.006

0.098 ± 0.008

0.170 ± 0.023

0.155 ± 0.002

0.134 ± 0.036

0.0173 ±0.038

Total carbon (g L-1)

16.42 ± 0.86

15.55 ± 0.69

18.63 ± 1.23

13.67 ± 0.30

15.87 ± 0.58

15.80 ± 0.66

Total organic carbon (g L-1)

12.23 ± 0.76

11.44 ± 0.64

14.04 ± 0.52

9.793 ± 250

11.87 ± 0.51

11.75 ± 0.66

Total nitrogen (g L-1)

4.63 ± 0.24

4.57 ± 0.19

5.14 ± 0.14

4.60 ± 0.15

4.21 ± 0.05

4.28 ± 0.05

Ammonia nitrogen (g L-1)

2.61 ± 0.03

2.69 ± 0.02

2.83 ± 0.01

2.85 ± 0.01

2.94

2.98

Crude protein (g L-1)

12.67

11.73

14.42

10.97

7.95

8.16

Volatile organic acids:

      

Acetic acid (mg L-1)

<1

126

407

207

215

551

Propionic acid (mg L-1)

<1

<1

<1

66

<1

<1

Butyric acid (mg L-1)

<1

<1

<1

<1

<1

<1

Water-eluable elements

      

Calcium (mg L-1)

43.4

56.5

54.3

86.0

36.3

61.8

Iron (mg L-1)

5.33

5.56

5.20

4.88

4.26

6.91

Magnesium (mg L-1)

4.57

5.81

6.30

12.5

11.4

9.63

Nickel (mg L-1)

<4

<4

21.4

20.8

<4

<4

Phosphorus(mg L-1)

132

145

161

139

151

151

Potassium (mg L-1)

1,703

1,687

1,682

1,659

1,755

1,690

Sulfur (mg L-1)

46.6

43.2

56.9

43.1

47.3

49.6

  1. In case of multiple determinations, standard deviations are presented.
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Energy, Sustainability and Society

ISSN: 2192-0567

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