2.3 Research on High-Efficient Anaerobic Fermentation Technology …
37
0
50
100 150 200 250 300 350 400 450
0
10
20
30
40
50
60
70
80
90
Methane Content (%)
Time (h)
NSHP-S
SHP-S
NSHP-T
SHP-T
0
50 100 150 200 250 300 350 400 450 500
0
1000
2000
3000
4000
5000
6000
7000
hydrogenogenic stage
Accumulation Biogas Production (mL)
Time (h)
NSHP-S
SHP-S
NSHP-T
SHP-T
methanogenic stage
0
5
10
15
20
25
30
35
40
0
20
40
60
80
100
120
140
NSHP-S
SHP-S
NSHP-T
SHP-T
Gompertz Model for
Hydrogen Production (mL)
Time (h)
0
50
100 150 200 250 300 350 400 450
0
500
1000
1500
2000
2500
3000
3500
NSHP-S
SHP-S
NSHP-T
SHP-T
Gompertz Model for
Methane Production (mL)
Time (h)
(c)
(a)
(d)
(b)
Time (h)
Time (h)
Time (h)
Time (h)
Fig. 2.17 Biogasification performance and kinetic analysis during the different AD processes.
a Accumulative biogas production; b methane proportion; c accumulative biohydrogen production;
d accumulative methane production
Table 2.4 Kinetic analysis of biohydrogen and methane production in the different AD processes
AD
processes
Hydrogenogenic stage
Methanogenic stage
a P max (mL)
b R max
(mL/h)
c λ (h)
a P max (mL)
b R max
(mL/h)
c λ (h)
SHP-S
51.53
4.01
6.01
1759.62
8.03
152.50
NSHP-S
4.36
0.30
7.50
1658.25
10.32
282.54
SHP-T
98.88
13.33
11.25
3519.38
15.81
175.47
NSHP-T
126.59
8.39
5.60
2638.16
15.07
202.17
a P is the biogas production potential (mL)
b R is the maximum biogas production rate (mL/h)
c λ is the lag phase time (h)
2.3.1.2 Ethanol and VFA Contents
During the anaerobic digestion processes, the generation of VFAs and ethanol typically accompanied the formation of hydrogen. Therefore, the concentrations and
compositions of the generated soluble metabolites can serve as effective indicators