Environmental Engineering Reference
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dejections, agricultural wastes and waste water). The feed from the storage tank is ensured by
gravity. The partial draining is carried out through the pond thanks to the phenomenon of the
communicating vases. The daily supply of the digester in biomass ensures a continuity of the
bio-methanisation process which allows, beyond a digestion temperature of 15° C, a
renewable production of biogas.
Description
Digestion enclosure: of cylindrical form, the digestion enclosure is characterized by a
lower section in V shape for the deposit as well as the evacuation of the large particles and a
higher section in dome for the recovery of the produced biogas.
Gasometric bell
Biogaz exit
Solar collector
Storing reservoir
Ground
level
Pond
5,7 m
Digestion
enclosure
2m
3 m
Draining
6 m
Figure 1. Family Digestor.
Storage reservoir: of rectangular or cubic form, it allows the deposit of animal dejections
and their dilution for the preparation of a fluid and homogeneous digestion substrate.
Pond: of identical form to that of the storage reservoir, it allows the recovery of the
digested substrate.
Gasometrical Bell: it caps the dome of the digestion tank and allows the storage of biogas
by keeping it at constant pressure. Once withdrawn, it is also used as an inspection pit at of
the digester.
Piping: Materialized by tubes, they ensure the arrival of the biomass towards the digester.
After digestion, they allow the discharge of the digested biomass in the pond. A drain at the
bottom of the digestion enclosure is used in the complete draining of the digester. A smaller
diameter piping (21/27 mm) is used for the routing of the produced biogas towards the family
kitchen.
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