CONTROLLER FOR DISTRIBUTION PATTERN OF DISSOLVED OXYGEN IN AERATION TANK

摘要

PURPOSE:To control the quality of water at high accuracy, by comparing the detected value of O2 concentration in each room of the aeration tank with the arbitrarily set value, and by adjusting the amount of air supply for each room so as to make the distribution pattern of dissolved oxygen concentration in each room to be optimum. CONSTITUTION:The O2 concentration in each room A-D of the aeration tank 1 is detected by each O2 concentration detector 5a-5d; these detected values are inputted to the air supply controller 6 which is inputted the return sludge concentration signal 8 and the water quality signal 9 for the influent sewage from other parts. Hereby, the controller 6 takes in the signal 8 and the signal 9 as the data, and determines the optimum pattern of the dissolved oxygen concentration in each room A-D. The controller 6 compares this optimum pattern with the actually detected value of each room, and adjusts the air supply control valves 4a-4d for each room so as to make the distribution condition of the dissolved O2 concentration of each room to coincide with the optimum pattern, and generates the control signals 7a-7d. As a result, the distribution pattern of dissolved O2 concentration in the aeration tank 1 can be controlled to the optimum condition at excellent accuracy.