| abstract |
A device for a plant producing biogas from biological mate rial by anaerobic fermentation, in which a fermenting mass (14) is contained by a container (1), a first cover (4) is detachably connected in a fluid- sealing manner to the side wall (s) (12) of the container (1), forming a closed first space (43) above the fermenting mass (14), and at least one portion (42, 45, 52, 55) of a fluid- communicating conduit forms a connection between the first space (43) and the sur roundings, the at least one fluid-communicating conduit por tion (42, 45, 52, 55) being provided with a first valve (31/H1) arranged to limit the gas pressure above the ferment ing mass (14) to a first gas pressure, the first valve (31/H1) being formed by the at least one conduit portion (42, 45, 52, 55) being submerged in a vessel (3) filled with liq uid. |