Patent DE-20321422-U1 (DE)
Title: Phosphate elimination device by a simple metering unit in pilot or small-sized sewage treatment plants, comprises a container for storing precipitating agent, a metering unit with a metering chamber, and a discharge- and a feed line
IPC: C02F1/58
Filed: 2003-09-23
Abstract: The phosphate elimination device by a simple metering unit for the dosage of a precipitating agent in pilot or small-sized sewage treatment plants with an air compressor/blower, comprises a container for storing precipitating agent, a metering unit with a metering chamber, and a discharge- and a feed line. The metering container (5) exhibits a round, multi-edged or other geometrical form. The dosage of the precipitating agents is controlled with respect to time, wastewater quantity or other control variables. The phosphate elimination device by a simple metering unit for the dosage of a precipitating agent in pilot or small-sized sewage treatment plants with an air compressor/blower, comprises a container for storing precipitating agent, a metering unit with a metering chamber, and a discharge- and a feed line. The metering container (5) exhibits a round, multi-edged or other geometrical form. The dosage of the precipitating agents is controlled with respect to time, wastewater quantity or other control variables. The control procedure helps to easily calculate the used-up and/or the remaining quantity of the precipitating agent from the number of accomplished metering steps. The operator/maintenance personnel is informed well in advance of the needed refilling of the precipitating agents and a loss of the phosphate elimination through lack of the precipitating agent is avoided. The procedure/the device is equipped with an own control mechanism. The metering container is provided with firm or flexible feed- and/or discharge- compressed air lines. The metering container is built with a variable volume to easily adjust the metering volume per metering step. The adjustment of metering volume takes place in a procedure arrangement through a movable, adjustable piston in the metering container. The metering container in the procedure arrangement is accurately led over a guidance rod in a storage vessel (1). Length of a feed line- (6) and a discharge compressed air line (4) projecting into the metering container are variable in the procedure arrangement. In a procedure arrangement, the height of the metering container towards a float (2) is adjustable, to change the fluid level of the metering container. A compressed air leaves through the downwardly extended feed line and leads to a thorough mixing of the precipitating agents in the storage vessel. The float function is replaced by the buoyancy of the metering container. All or every feed- and discharge-lines are equipped with flaps, valves or other locking arrangement. The storage vessel is provided with a refilling line or mechanism, to refill a used-up quantity of the precipitating agent. The lid of the storage vessel is provided with one or more aeration and/or deaeration devices, and is implemented as a flap or screw-type, or in a movable or detachable manner. The components of the device are made of plastic or other component and/or material. The storage vessel is provided with a holding device, to fix or fasten the wastewater treatment plant. The compressed air needed for the operation of the metering chamber is obtained from air supply of the blower membranes or the air jet lifts for feed. The procedure/the device is used in arrangements without the application of a blower. A simple and an accurate dosage of the supplied waste water quantity corresponding to the small-scale sewage treatment plant take place to avoid both an under- and an overdosage of the precipitating agent in connection with a control mechanism of small sewage treatment plants by a pressure sensor device in a procedure arrangement.