Performance assessment of cascade controllers for nitrate control in a wastewater treatment process |
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Authors: | Hongbin Liu ChangKyoo Yoo |
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Affiliation: | 1.Department of Environmental Science and Engineering, Center for Environmental Studies,Kyung Hee University,Gyeonggi-do,Korea |
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Abstract: | A cascade control strategy is proposed to the benchmark simulation model 1 (BSM1) to enhance the treatment performance of
nitrogen removal in a biological wastewater treatment plant. The proposed control approach consists of two control loops,
a primary outer loop and a secondary inner loop. The method has two controllers of which the primary loop has a model predictive
control (MPC) controller and the secondary loop has a proportional-integralderivative (PID) controller, which is a cascade
MPC-PID controller. The primary MPC controller is to control the nitrate concentration in the effluent, and the secondary
PID controller is to control the nitrate concentration in the final anoxic compartment. The proposed method controls the nitrate
concentrations in the effluent as well as in the final anoxic reactor simultaneously to strictly satisfy the quality of the
effluent as well as to remove the effects of disturbances more quickly by manipulating the external carbon dosage rate. Because
the control performance assessment (CPA) technique has the features of determining the capability of the current controller
and locating the best achievable performance, the other novelty of this paper is to suggest a relative closed-loop potential
index (RCPI) which updates the CPA technology into a closed-loop cascade controller. The proposed method is compared with
a cascade PID-PID control strategy and the original PID controller in BSM1 and an improved performance of the suggested cascade
MPC-PID controller is obtained by using the CPA approach. |
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