|
Parameter
|
Energy cane stillage (n = 3)
|
Sugar cane stillage (n = 6)
|
t test
|
|---|
|
(mg/L)a
|
(µM)
|
(mg/L)a
|
(µM)
|
p value
|
|---|
|
tCOD
|
43,398 ± 3133
|
NR
|
30,106 ± 2186
|
NR
|
0.0064 (#)
|
|
sCOD
|
40,279 ± .893
|
NR
|
25,875 ± 381
|
NR
|
0.00043 (#)
|
|
pH
|
4.30 ± 0.03
|
NR
|
4.32 ± 0.00
|
NR
|
0.051 (=)
|
|
C:N pelletb
|
11.2:1
|
NR
|
13.8:1
|
NR
|
NR
|
|
Ammonia
|
509.2 ± 26.5
|
9519.2 ± 496.3
|
260.5 ± 113.7
|
4869.5 ± 2126.0
|
0.00057 (#)
|
|
Arabinose
|
15.6 ± 0.7
|
104.1 ± 4.9
|
0.7 ± 0.1
|
4.8 ± 0.8
|
0.00065 (#)
|
|
Galactose
|
45.1 ± 0.0
|
250.3 ± 0.0
|
1.7 ± 0.3
|
9.6 ± 1.7
|
8.7 × 10−12 (#)
|
|
Glucose
|
1275.7 ± 7.2
|
7080.9 ± 39.7
|
0.4 ± 0.0
|
2.5 ± 0.2
|
1.1 × 10−5 (#)
|
|
Xylose
|
0.4 ± 0.7
|
2.8 ± 4.9
|
0.8 ± 0.3
|
5.5 ± 1.9
|
0.44 (=)
|
|
Mannose
|
1.4 ± 0.7
|
7.6 ± 3.8
|
0.3 ± 0.1
|
1.9 ± 0.6
|
0.12 (=)
|
|
Fructose
|
67.1 ± 16.1
|
372.6 ± 89.3
|
2.1 ± 0.9
|
11.6 ± 4.9
|
0.020 (#)
|
|
Succinic acid
|
169.6 ± 12.6
|
1436.1 ± 107.1
|
57.8 ± 2.3
|
489.3 ± 19.7
|
0.0038 (#)
|
|
Lactic acid
|
3376.1 ± 40.1
|
37,478.5 ± 445.5
|
3158.4 ± 27.3
|
35,062.6 ± 302.8
|
0.0040 (#)
|
|
Glycerol
|
NA
|
NR
|
937.2 ± 5.3
|
10,177.4 ± 57.8
|
–
|
|
Acetic acid
|
–
|
–
|
2710.2 ± 20.0
|
45,131.6 ± 332.9
|
–
|
|
Fumaric acid
|
<
|
<
|
–
|
–
|
–
|
|
HMF
|
NA
|
NR
|
6.8 ± 0.0
|
54.2 ± 0.4
|
–
|
|
Furfural
|
NA
|
NR
|
40.2 ± 0.5
|
417.9 ± 4.8
|
–
|
|
Ethanol
|
NA
|
NR
|
7290.0 ± 370.0
|
158,237.5 ± 8031.3
|
–
|
|
Fluoride
|
NA
|
NR
|
–
|
–
|
–
|
|
Chloride
|
206.4 ± 0.7
|
5822.3 ± 18.5
|
–
|
–
|
–
|
|
Nitrite
|
NA
|
NR
|
1.6 ± 2.2
|
34.5 ± 48.8
|
–
|
|
Bromide
|
NA
|
NR
|
0.4 ± 0.6
|
4.9 ± 7.0
|
–
|
|
Nitrate
|
NA
|
NR
|
0.6 ± 0.6
|
9.1 ± 8.9
|
–
|
|
Phosphate
|
216.1 ± 14.1
|
2275.5 ± 148.8
|
175.0 ± 57.8
|
1842.8 ± 608.6
|
0.13 (=)
|
|
Sulfate
|
2225.2 ± 4.6
|
23,162.6 ± 48.4
|
1743.9 ± 88.3
|
18,152.1 ± 919.1
|
1.5 × 10−5 (#)
|
-
apH is expressed in units and C:N pellet is a ratio
-
bSingle measurement of the small amount of pellet material obtained
-
– Not detected, < below detection limit, NA not analyzed, NR not relevant, # significantly different (p < 0.05), = not significantly different (p > 0.05)
