Aerobic sludge age control device for sewage disposal plant and method

Abstract

The invention relates to a control device and method for the oxic sludge age of a sewage treatment plant. The device is equipped with an aerobic tank, in which a sludge concentration meter and a thermometer are arranged. The end of the aerobic tank is provided with a sludge pump which is communicated with the bottom of the tank through a pipeline; the device is also provided with a controller that is in signaling connection with the sludge concentration meter and the thermometer and in controlling connection with the switch of the sludge pump. The method for controlling the oxic sludge age byusing the device comprises the following steps: 1) the control device is started, with parameters set; 2) the aerobic tank operates to a sludge discharging period T1; 3) the step 2) is repeated; 4) the tank operates for another period of time until a comparative period T2; 5) computing control is conducted in the controller; 6) the controller is used for controlling the starting time of the sludge pump to discharge sludge according to a newly generated sludge discharging t0; and 7) the steps from 2) to 6) are repeated. The invention is applicable to the sludge age control of the aerobic tank,and can control the sludge discharging period and improve the sewage treatment effect.

Description

Device and method for controlling aerobic sludge age in sewage treatment plant technical field The invention belongs to a sewage treatment technology for denitrification and phosphorus removal, in particular to a device and method for controlling mud age in an aerobic pool in an A2 / O sewage treatment process. Background technique In the A2 / O sewage treatment method, since the nitrification effect of the sewage treatment plant is mainly affected by the aerobic sludge age, it is necessary to maintain a long sludge age to ensure the good progress of the nitrification process. However, maintaining an excessively long aerobic sludge age reduces the discharge of sludge, thereby reducing the phosphorus removal effect. Therefore, it is necessary to control the aerobic sludge age within an appropriate range. At present, there is no good method for stable control of aerobic sludge age, mainly by setting a constant sludge discharge time. However, due to the change of sewage influen...

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Problems solved by technology

However, due to the change of sewage influent load, the sludge concentration in the aeration tank will also change in the same constant time. Therefore, setting a constant sludge discharge time cannot stabilize the aerobic sludge age at an effective level. within the range

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