Control device for a sewage treatment system, sewage treatment system, and method for operating a sewage treatment system

Abstract

The object of the present invention is to provide a control device for a sewage treatment system, a sewage treatment system, and a method for operating a sewage treatment system that can take action without delay to suppress the deterioration of treated water quality in response to fluctuations in the amount of sewage inflow in sewage treatment accompanied by aeration treatment, and can also reduce operating costs. [Solution] To solve the above problems, the present invention provides a control device for a sewage treatment system, a sewage treatment system equipped therewith, and a method for operating this sewage treatment system, comprising: an inflow volume prediction means for predicting the amount of water flowing into the sewage treatment unit; a dissolved oxygen amount calculation means for calculating the amount of dissolved oxygen required in the sewage treatment unit based on the prediction results; and a control unit that controls the operation of an aeration device installed in the sewage treatment unit so that the amount of dissolved oxygen is calculated before the scheduled time when the predicted inflow volume is reached.

Claims

1. Inflow volume prediction means for predicting the amount of water flowing into a sewage treatment unit that receives and treats sewage, A dissolved oxygen amount calculation means calculates the amount of dissolved oxygen required in the sewage treatment unit based on the amount of inflow water predicted by the inflow water amount prediction means and water quality, A control device for a sewage treatment system, comprising: a control unit that controls the operation of an aeration device provided in the sewage treatment unit so that the dissolved oxygen amount calculated by the dissolved oxygen amount calculation unit reaches the amount of dissolved oxygen calculated by the dissolved oxygen amount calculation unit before the scheduled time when the amount of inflow predicted by the inflow prediction unit is reached.

2. A sewage treatment unit that receives and treats sewage, A sewage treatment system comprising a control device for a sewage treatment system as described in claim 1.

3. The aforementioned sewage treatment unit includes a reaction tank equipped with an aeration device, The wastewater treatment system according to claim 2, characterized in that the control unit lowers the water level in the reaction tank in conjunction with the operation control of the aeration device.

4. The wastewater treatment system according to claim 2, characterized in that the inflow volume prediction means predicts the inflow volume to the wastewater treatment unit within one hour ahead.

5. The wastewater treatment system according to claim 2, characterized in that the wastewater treatment unit comprises an OD tank, and the aeration device is a stirrer for the OD tank.

6. A method for operating a sewage treatment system equipped with a sewage treatment section for receiving and treating sewage, A sewage treatment step in the sewage treatment unit, which involves receiving and treating sewage, The inflow volume prediction step predicts the amount of water flowing into the aforementioned sewage treatment unit, A dissolved oxygen calculation step, which calculates the amount of dissolved oxygen required in the wastewater treatment step based on the amount of influent and water quality predicted in the influent amount prediction step, A method for operating a sewage treatment system, comprising: a control step of controlling the operation of an aeration device provided in the sewage treatment unit so that the dissolved oxygen amount calculated in the dissolved oxygen amount calculation step is reached before the scheduled time when the inflow water volume predicted in the inflow water volume prediction step is reached.

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