2011 International Conference on Alternative Energy in Developing Countries and Emerging Economies
- 25 -
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
20000
22000
HydrogenProductionRate (mL/dL)
0
0.5
1
1.5
2
2.5
EffluentXyloseConcentration (g/L)
HydrogenProductionRate
EffluentXylose Concentration
0
5
10
15
20
25
30
35
40
0 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60
Time (day)
MetabolicProducts (mM)
0
1
2
3
4
5
6
7
8
pH
ETOH AA PA BA LA FA pH
Fig. 2. Profiles of hydrogen production rate, effluent xylose
concentration, pH, and metabolite concentrations in the AF reactor
operated at 55 ºC and the OLR of 15 (
I
), 30 (
II
), 60 (
III
), and 120 (
IV
)
g-xylose/d/L. ETOH: ethanol; AA: acetate; PA: propionate; BA:n-&
iso-butyrate; LA: lactate; FA: formate.
IV. C
ONCLUSIONS
Hydrogen can be successfully produced with rather
high yield and rate from the UASB reactor and AF
reactor, respectively. High hydrogen yield of 251.2±11.3
ml
–
H
2
/g-xylose, corresponding to the hydrogen
production rate of 15073.8±675.5 mL
–
H
2
/d/L was
achieved from the UASB reactor operated the OLR of 60
g
–
xylose/d/L. Meanwhile, the AF reactor can produce
high hydrogen production rate of 19383.5±693.9 ml-
H
2
/d/L, corresponding to hydrogen yield of 161.5 ± 5.8
mL
–
H
2
/g
–
xylose. The soluble solution generated from
both UASB and AF reactors was mainly contained
mainly with the metabolite products of butyrate and
acetate.
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I
II
III
IV
