The ever-increasing sewage from factories and residence heavily damage water resources, resulted a lot of environmental pollution. This has a seriously bad effect on people’s health and economic development, and so the treatment of sewage is imminent.To control the dissolved oxygen (DO) in sewage is crucial in the activated sludge process which is used mostly in all the sewage treatment methods at present. The DO is a key factor on which the cost and the quality of the treatment depends. Because the concentration of the DO is usually adjusted through the change of aeration machines’ speed, the oxygen-infuse capacity of an aeration machine at different speed is prime significance. In order to optimize the operation of aeration machines it is necessary to analyze the capacity. Take the case of double-rotor underwater aeration machine (DRUAM), and the following job was carried out.1. Analyzing the structure of the DUUAM and the relations between the speed and the aerated discharge infused into water by aeration machine based on Fluid Dynamics and Fluid-machine theory.2. With the aid of regression analysis, finding the relations between the speed and the utilization ratio of oxygen, and the aerated discharge infused into water through experiments.3. Construct a DO Fuzzy controller. Based on the conclusion drawn form analysis and experiment, simulate the control of the DO respectively with consideration of the oxygen-infuse ability of an aeration machine at different speed and without, and then compare the results from the simulation.
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