Research on Dissolved Oxygen Fuzzy Controller in Sewage Treatment Process

Aiming at the problem of precise aeration in AAO processes, a new dual-fuzzy controller is presented in this paper. For the oxygen rising and falling process with different time scale characteristics, two fuzzy controllers are respectively designed comprehensively considering dissolved oxygen and influent loads. Simulation results based on BSM1 experimental data verify the feasibility of the method, and the system has been tested on some sewage plant. Compared with some published relevant methods, the experimental results show that the presented method can still achieve good precision of dissolved oxygen when influent loads change.