Patent EP-2348098-A1 (EP)
Inventor: WIEDAU HELMUT
IPC: C12M1/107
Filed: 2010-01-20
Abstract: The ground basin fermenter (1) comprises a depressed basin base, which is covered with a sealing layer (3) and forms a ground basin (2), a gas-tight cover (26, 27) fixed at a basin crown of the basin base, inlet and outlet lines, and a stirrer. A flow guide wall (10) is provided inside the ground basin and causes a sub-division of the cross-section of the ground basin along one section, so that a media flow is formed at both sides of the flow guide wall during the actuation of the stirrer. The height of the flow guide wall is larger than the maximum filling level in the ground basin. The ground basin fermenter (1) comprises a depressed basin base, which is covered with a sealing layer (3) and forms a ground basin (2), a gas-tight cover (26, 27) fixed at a basin crown of the basin base, inlet and outlet lines, and a stirrer. A flow guide wall (10) is provided inside the ground basin and causes a sub-division of the cross-section of the ground basin along one section, so that a media flow is formed at both sides of the flow guide wall during the actuation of the stirrer. The height of the flow guide wall is larger than the maximum filling level in the ground basin. The flow guide wall extends itself in a longitudinal direction of the ground basin, and is formed by a flow guide wall which extends itself along a main axis of the ground basin and subdivides the cross-section of the ground basin into two equal parts. A flow cross-section is released between the longitudinal ends of the flow guide wall and a basin wall area opposite-lying in the longitudinal direction. The stirrer is formed at both sides of the flow guide wall by two immersion-stirrers, which are aligned with their rotational axis parallel to the flow guide wall and/or main axis. The immersion-stirrers arranged on the supports inside the ground basin in a highly-adjustable manner. The supports are mounted on an operating bridge with their upper ends. The operating bridge clamps itself over the ground basin along a secondary axis of the ground basin and forms a part of the gas-tight cover. The basin crown parallelly extends at both longitudinal sides of the ground basin and is completed at the both narrow sides by a semi-circle. Further stirrers between the flow guide wall and the longitudinal sides are arranged in the semi-circle areas, where the rotational axes of the further stirrers are oriented parallel to the flow guide wall. The gas-tight cover is formed by an outer membrane and an inner membrane. The flow guide wall forms a support on a location for fixing belt nets, by which the inner membrane is spatially kept from the basin base in a pressureless state, where the inner membrane is a part of the gas-tight cover. A heating element is arranged inside the flow guide wall or at its outer side for heating the medium. The stirrer is height-adjustable along an obliquely-running support, where the height-adjustment is carried out a raising rope, which is attached at the stirrer with one end and upwardly causes a movement of the stirrer by raising, and a retrieving rope, which is attached at the stirrer with one end and is guided over a deflection roller arranged in the area of the lower ends of the obliquely-running support, so that a movement of the stirrer is downwardly caused by raising the same.