|
System 1
|
System 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 ± 570a
|
11,000 ± 1,000
|
7,000 ± 93
|
3,940 ± 42a
|
Phenolic compounds
|
758 ± 100
|
840 ± 42a
|
1,083 ± 150
|
460 ± 40
|
519 ± 10b
|
Color*
|
0.10 ± .001
|
0.11 ± 0.003a
|
0.13 ± 0.012
|
0.13 ± 0.003
|
0.14 ± 0.005b
|
SO4
2-
|
371 ± 90
|
200 ± 56a
|
530 ± 141
|
540 ± 50
|
70 ± 40b
|
TN
|
120 ± 15
|
723 ± 52a
|
172 ± 21
|
688 ± 79
|
408 ± 91b
|
N-NH3
|
5 ± 0.6
|
57 ± 1a
|
7 ± 1
|
5 ± 0.7
|
31 ± 4b
|
PO4
3-
|
29 ± 5
|
49 ± 6a
|
41 ± 7
|
22 ± 2
|
46 ± 7a
|
Biogas production**
|
-
|
2,370 ± 149a
|
-
|
-
|
1,102 ± 83b
|
Methane content***
|
-
|
65 ± 5a
|
-
|
-
|
74 ± 6b
|
- All values are expressed in mg/L, * Color is the absorbance at 475 nm, ** Biogas production at mL, *** Methane content at percentage. Each value is a mean ± SD. Different case letters indicate significant difference between means of UASB effluent in System 1 and System 2 for each parameter (One-way ANOVA, multiple range test, P < 0.05)