WASTEWATER TREATMENT DEVICE, WASTEWATER TREATMENT METHOD, WASTEWATER TREATMENT SYSTEM, CONTROL DEVICE, CONTROL METHOD, AND PROGRAM

摘要

The present invention performs biological treatment of water to treat flowing within a plurality of aerobic tanks (2a-2d) configuring a reaction tank (2). Air is supplied to the reaction tank (2) from air diffusers (6a-6d) respectively provided to each of the aerobic tanks (2a-2d), aerating the water to treat. A nitrate meter (7) is provided at the inflow side of aerobic tank (2c), which is the desired position along the flow of water to treat in the reaction tank (2), and the nitrate concentration is measured. The nitrate meter (7) supplies the measured value of the nitrate concentration to a control unit (9). On the basis of the value of the nitrate concentration, in a manner so that the nitrate concentration falls within a predetermined range of controlled nitrate concentrations, the control unit (9) supplies a control signal to each gas supply amount control unit (10a-10d) to control the amount of supply of gas to the water to treat from the air diffusers (6a-6d) for each air diffuser (6a-6d) or in a batch manner for the air diffusers (6a-6d).