Patent DE-102009034743-A1 (DE)
Title: Method and apparatus for cleaning wastewater in small sewage treatment systems and small-sized sewage treatment systems, comprise treatment zones such as mechanical treatment zone, biological treatment zone and final clarification zone
Inventor: BOLLER REINHARD
IPC: C02F3/08
Filed: 2009-07-26
Abstract: The method and apparatus for cleaning wastewater in wastewater treatment systems such as small sewage treatment systems and small-sized sewage treatment systems, comprise treatment zones such as mechanical treatment zone, biological treatment zone (5) and final clarification zone (6) existing in the small sewage treatment systems and small-sized sewage treatment systems, in which the biological zone contains free-floating plastic body (8) or fixed solid bed to which or onto which the activated sludge or biomass is fixed and in which the flow is limited by the system with a throttle device. The method and apparatus for cleaning wastewater in wastewater treatment systems such as small sewage treatment systems and small-sized sewage treatment systems, comprise treatment zones such as mechanical treatment zone, biological treatment zone (5) and final clarification zone (6) existing in the small sewage treatment systems and small-sized sewage treatment systems, in which the biological zone contains free-floating plastic body (8) or fixed solid bed to which or onto which the activated sludge or biomass is fixed and in which the flow is limited by the system with a throttle device or a device for limiting the flow. The individual treatment zones occur in a container (1) that is subdivided into chambers or in several containers. The method and the apparatus are retrofitted in new systems incorporated as in the existing systems. The throttle device disposes over a device, which cleans the opening of the throttle device with the aid of the fluctuating water surface. The opening of the throttle device is supported with a lifting body or a floating bed body. The limitation of the flow is carried out by the device with a compressed air lifter (9) arranged in the final clarification zone. The compressed air lifter conveys wastewater quantity from the sewage treatment system, where the wastewater quantity defines in short time intervals. The limitation of the flow takes place in an outlet of the mechanical treatment zone or an inlet of the biological treatment zone or in an outlet of the biological treatment zone or an inlet of the final clarification zone or an outlet of the final clarification zone by arranging the corresponding components. The water level changes resulting from the limitation of the flow by the device is used to control the sewage treatment system with the aid of high level detector (e.g. floatator, pressure sensor or level sensor) in a load-dependent manner. An air supply of the compressed air lifter for flow limitation is connected to an air supply of an aerating device (7) to spare an additional air line from a control cabinet to the sewage treatment system. The system for quantity limitation is used as the throttle device. The flow quantity is calculated in a control by a high level measurement in connection with the throttle device. An alarm message is delivered by the high level measurement when a water level adjusts to high in the sewage treatment system by the plugged throttle device.