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Aerobic biological fluidized bed inner loop is a new , highly efficient wastewater treatment technology , which combines the activated sludge and biofilm characteristics of both , with a high volumetric loading , mass transfer speed , impact capacity, small footprint , stable operation , etc., but its energy consumption than normal activated sludge many times higher . Meanwhile ammonia wastewater treatment process with a large time constant , nonlinear and time-varying , for this complex process for control purposes to establish the mathematical model is difficult, the control issue has become difficult . Therefore, the study of its closed-loop control to overcome the energy waste caused by over- aeration effluent ammonia concentration stabilization makes compliance is essential . This simulation method mainly aerobic biological fluidized bed circulating ammonia wastewater treatment closed-loop control problem. In order to establish the simulation model of the controlled object , first studied the aerobic phase circulating fluidized bed reactor ammonia biological wastewater treatment process and the experimental process, ignoring minor factors , the establishment of aeration as input , the effluent ammonia concentration of ammonia wastewater output biological fluidized bed process leading mathematical model . Second, based on this model to establish a biological fluidized bed process an order ammonia wastewater treatment ADRC control system and second-order ADRC control system simulation model, and they are carried out at the nominal model parameter perturbation , environmental interference , etc. case simulation. Finally ADRC output limiter and optimizing its parameters , obtain a given step and the next step input disturbance steady-state error is zero , no overshoot , settling time less than or equal 2000s performance , internal disturbance and external disturbance has strong robustness . ADRC This feature overcomes the controlled object imprecise or uncertain issues , which can be applied to biological fluidized bed ammonia wastewater engineering process .
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