Patent EP-2311933-A1 (EP)
Inventor: WIEDAU HELMUT
IPC: C12M1/107
Filed: 2009-06-24
Abstract: The ground basin fermenter comprises a depressed basin base (3), which is covered with a sealing layer (4) and forms a ground basin (19), and a control bridge. Around the basin crown (2) of the ground basin, a gas-tight cover is fixed in the form of a gas membrane (7, 8). The inlet and outlet lines and a stirrer are provided. A bridge point is provided for the stirrer or for a guide- or support element for the stirrer at the level of the basin crown or within the region above the basin crown and within the extent of the basin crown. The ground basin fermenter comprises a depressed basin base (3), which is covered with a sealing layer (4) and forms a ground basin (19), and a control bridge. Around the basin crown (2) of the ground basin, a gas-tight cover is fixed in the form of a gas membrane (7, 8). The inlet and outlet lines and a stirrer are provided. A bridge point is provided for the stirrer or for a guide- or support element for the stirrer at the level of the basin crown or within the region above the basin crown and within the extent of the basin crown. The bridge point is equipped external of the gas-tight membrane. A drive element of the stirrer or the guide- or support element of the stirrer is gas-tightly passed through an opening in the gas tight membrane. The guide element is formed through a guide rail that is anchored with its lower end in a foundation at the basing base and with its upper end that is passed through the gas-tight membrane on which the bridge point is supported. The sealing layer of the basin base is implemented in penetration-free manner and the inlet and outlet lines are implemented above the basin base and within the basin crown in the interior of the ground basin. The control bridge overstretches the ground basin and the bridge point is formed on the control bridge. In the control bridge, openings are intended through which the inlet ad the outlet line and/or the guide- or support element and/or the drive element of the stirrer are gas tightly passed through in the ground basin. On the control bridge, a sealed lockable service duct is arranged with a duct opening in which the bridge point is equipped for the guide- or support element of the stirrer, which is height-adjustable along the guide element. The service-duct is connected with the inlet and the outlet line that communicates with the interior area of the fermenter. The control bridge is supported over a support against the basin base. In the control bridge, an inspection window is included that is gas-tightly lockable. The bridge control comprises a carrier and a ground covering plate. The bridge control forms a section of gas tight cover with its ground covering plate. The gas membrane or gas membrane part is connected with the bridge control so that the bridge control forms together with the gas membrane or the gas membrane part of the gas tight cover of the ground basin. The gas tight connection is formed between the bridge control and the gas membrane or the gas membrane part through a gas tight clamping in the edge area of the bridge control. A bridge path is mounted on an end in the area of the basin crown and protrudes with its free end in the basin crown. The bridge point is formed on the bridge path.