Environmental Engineering Reference
In-Depth Information
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Fig. 8.15
Average performance of the thermophilic methane fermentation on ammonia-stripped
CM and raw CM
The mean conditions for all 305 methanogenic plants operated in Japan are as
shown in Fig.
8.17
. The average gas composition was 60 % methane (36 % of CO
2
and 1164 ppm of H
2
S) and the average biogas yield was 11m
3
of gas per m
3
of
sludge processed. Average TS and VS reductions were 51 % and 57 % respectively.
The average pH in the digesters remained stable throughout the year at ~ 7.25. TS,
VS and COD reductions were 44.2, 54.2 and 60 % respectively. Biogas production
magnification ranged from 20 to 30, which was twice the average values of other
waste water treatment plants (WWTP) in Japan.
8.4.6
Co-Digestion
Anaerobic digestion can also be applied to wastes from different sources in a co-
digestion process. One example of biomass utilization based on both animal waste
