Environmental Engineering Reference
In-Depth Information
Biogas
holder
Power generator
Fueled with biogas
Desulfurization
Heat
exchanger
Sludge
cake drier
S
ewage
sludge
Ash
Incinerator
Centrifugal
dehydrator
Centrifugal
dehydrator
Fig. 8.16
Flow chart of the Hokubu sludge treatment center in Yokohama
Biogas production
2300 m
3
/day
CH
4:
60%
CO
2:
36%
H
2
S
1164ppm
NH
3
182ppm
CH
4
CO
2
Influent
215 m
3
/day
Sewage sludge
mesophilic fermentation
Effluent
TS
˖
1.3%
VS/TS
˖
64.3%
TS
˖
2.65%
VS/TS
˖
73.7%
HRT: 34 day
Temperature: 34
͠
Effect volume
˖
7300m
3
Digester
TS reduction
˖
51%
TVS reduction
˖
57%
Biogas production yield
˖
11m
3
/m
3
inf
Fig. 8.17
Average performance of the 305-methanogenic plants in Japan 2001
and food wastes collected from farms and food factories exists in Yagi, Kyoto
Prefecture. This integrated system (Yagi Bio-ecology center (YBEC)) is shown in
Fig.
8.18
(Ogawa
2005
).
The YBEC is a typical example of a biogas plant in successfully operation.
The animal and food wastes are collected from farms and food factories in Yagi
(a small town with a population of 9000) and this provides 42,000 t of biomass
