Research On Control Strategy Of Aeration Process In The Activated Sludge System

This thesis has been carried out based on the water treatment integrated equipment-research project of the mountain environment in the three Gorge Reservoir Area. The wastewater treatment system is one dynamic system of indeterminacy, time-variance, nonlinearity and posteriority. So it is difficult to create a precise mathematical model. Now the wastewater treatment plant of the three Gorge Reservoir Area exoterically adopts the control strategy of PID so that the organic matter-saturation of venting water fluctuates and the energy consumption is higher. Consequently, the new wastewater treatment technology development and the advanced control strategy application has been an important research subject of the wastewater treatment industry in order to bring down energy consumption and let up environmental pollution. Considering the higher energy consumption and greater fluctuation of venting water'quality in activated sludge process widespread adopted, this thesis applies the optimal control strategy to the aeration process of wastewater treatment. The research supplies the preparation of the water treatment integrated equipment with the theory support, also acquires the matter of academy studies and application. Meanwhile, it makes active sense of instructing the design of automatic control system of wastewater treatment.The author's contribution has been addressed in detail logically in this paper in the manner of running up the control strategy of minimum energy loss into the aeration process of wastewater treatment. Also, the author's design strategy and creativity has been given in this paper. Specifically, it includes:①Based on the feasibility analysis of the fit selection of control parameters in the aeration process, the aeration process of wastewater treatment of the joint-constructional complete-mixed activated sludge process has been aimed at in this paper. Then, the state equations of the aeration process have been proposed in this paper, which is on the base of dissolved oxygen concentration(DO) and discharge quantity of sludge(QW) as control variables , the concentration of BOD and sludge as state variables.②Based on the present study on optimization Control of wastewater treatment, the multivariable optimal control model with restriction factor has been presented in the paper with introducing modern control theory and system analysis into the field of activated sludge wastewater treatment,...