ࡱ> NPM[ Rjbjbj2ΐΐ"U  111EEE8}dEL} 888LLLLLLL$qNQh8Li1828888LL]G]G]G8: Z1L]G8L]G]GIGIUbkE EIKL0LI,{Q EP;VII{QV$1J 88]G888888L8L]G888L8888;V888888888 : al4l;m'`allYtǏ zvn'lXv^c6R \ghe Vn]^f[b ]f[b5ul] z| Ym_l Vn] 313000 Xd[al4l;m'`allYtǏ zn'lc6RHegv͑'`ch/fn'lSm^vlR`QT0[n'lv^~'` O!jW cQNNn'l[fON8^ĉv_sQc6RTPIDc6R0 sQ.͋al4lYt0Xv^c6R0n'l -NVR{|STP183 e.shƋxA Gain-Scheduling Control of the Dissolved Oxygen Concentration in Activated Sludge Wastewater Treatment Processes DU Shuxin College of Engineering, Huzhou University, Huzhou, Zhejiang Province, 313000, China Abstract: Dissolved oxygen (DO) concentration has long been recognized as a important controlled variable in the activated sludge wastewater treatment processes, and the fluctuation of DO concentration around the set-point and accumulated air consumption are taken as important performance parameters. The gain-scheduling control methods for DO concentration nonlinear model, where set-point value for DO concentration is considered as a scheduled variable, is presented. In the presented methods, the linear model is obtained by the expansion of Taylor series around the set point to approximate the nonlinear system at this set point, and then the optimal control method of linear system (such as reference model methods) is used to obtain a cluster of linear time invariant controllers. In the operation of the control system, the linear time invariant controller is scheduled according to the different scheduling values (the set point values of dissolved oxygen). 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Applying variable dissolved oxygen set point in a two level hierarchical control structure to a wastewater treatment process[J]. Journal of Process Control, 2015, 28:40-55. [2]Huang M, Wan J, Ma Y, Wang Y, et al. Control rule of aeration in a submerged biofilm wastewater treatment process using fuzzy neural networks[J]. Expert Systems with Application, 2009, 36:10428-10437 [3]Ruan J, Zhang C, Li Y, et al. Improving the efficiency of dissolved oxygen control using an on-line control system based on a genetic algorithm evolving FWNN software sensor[J]. Journal of Environmental Management, 2016,1-10 [4]Yang T, Qiu W, Ma Y, et al. Fuzzy model-based predictive control of dissolved oxygen in activated sludge processes[J], Neurocomputing, 2014,136:88-95 [5]Bahita M, Belarbi K. Fuzzy adaptive control of dissolved oxygen in a waste water treatment process[C]. IFAC 2014, 2015,48-24:66-70 [6]Ngfl hTx seP. 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