26
2 High-Efficient Anaerobic Fermentation Technology of Organic …
0
2 0
4 0
6 0
8 0
1 0 0
0
20
40
60
80
100
120
140
160
180
200
Acid
Enzyme
Control
Cumulative hydrogen production (mL)
Time (h)
Alkali
(a)
0
50
100
150
200
250
300
0
100
200
300
400
500
600
700
800
900
Control
Acid
Alkali
Enzyme
Cumulative methane production (mL)
Time (h)
(b)
Fig. 2.11 The cumulative hydrogen and methane production in response to different pre-treatments
as a function of time a hydrogenogenic stage and b methanogenic stage
2.2.2.4 Effects of Pre-treatment on Ethanol and VFA
Acetic, pentanoic, butyric, propionic, lactic, hexanoic acids, and ethanol were
observed in all experiments (Fig. 2.12). Trace amounts of ethanol were tested in
the control and the samples pre-treated with acid. Propionic and acetic acid were
2 High-Efficient Anaerobic Fermentation Technology of Organic …
0
2 0
4 0
6 0
8 0
1 0 0
0
20
40
60
80
100
120
140
160
180
200
Acid
Enzyme
Control
Cumulative hydrogen production (mL)
Time (h)
Alkali
(a)
0
50
100
150
200
250
300
0
100
200
300
400
500
600
700
800
900
Control
Acid
Alkali
Enzyme
Cumulative methane production (mL)
Time (h)
(b)
Fig. 2.11 The cumulative hydrogen and methane production in response to different pre-treatments
as a function of time a hydrogenogenic stage and b methanogenic stage
2.2.2.4 Effects of Pre-treatment on Ethanol and VFA
Acetic, pentanoic, butyric, propionic, lactic, hexanoic acids, and ethanol were
observed in all experiments (Fig. 2.12). Trace amounts of ethanol were tested in
the control and the samples pre-treated with acid. Propionic and acetic acid were