Table 3 Characterization of influent and effluent in systems 1 and 2

Parameter

Vinasse (diluted 7% v/v)

UASB effluent

Vinasse (diluted 10% v/v)

Fluidized bed bioreactor effluent

UASB effluent

COD

7,704 ± 800

4,000 ± 570^a

11,000 ± 1,000

7,000 ± 93

3,940 ± 42^a

Phenolic compounds

758 ± 100

840 ± 42^a

1,083 ± 150

460 ± 40

519 ± 10^b

Color*

0.10 ± .001

0.11 ± 0.003^a

0.13 ± 0.012

0.13 ± 0.003

0.14 ± 0.005^b

SO₄ ^2-

371 ± 90

200 ± 56^a

530 ± 141

540 ± 50

70 ± 40^b

TN

120 ± 15

723 ± 52^a

172 ± 21

688 ± 79

408 ± 91^b

N-NH₃

5 ± 0.6

57 ± 1^a

7 ± 1

5 ± 0.7

31 ± 4^b

PO₄ ^3-

29 ± 5

49 ± 6^a

41 ± 7

22 ± 2

46 ± 7^a

Biogas production**

-

2,370 ± 149^a

-

-

1,102 ± 83^b

Methane content***

-

65 ± 5^a

-

-

74 ± 6^b