Input/Output Linearization for a Real-Time pH Control: Application on Basic Wastewater Neutralization by Carbon Dioxide in a Fed-Batch Bubble Column Reactor

  • Chanin Panjapornpon Kasetsart University
  • Pawat Saksomboon Kasetsart University
  • Kittayot Juyteiy Kasetsart University
  • Jedsada Chinprasit Kasetsart University
Keywords: carbon dioxide utilization, I/O feedback, eco pH regulation, physical model, CO2 for pH treatment, fed-batch operation

Abstract

A model-based application for pH regulation in a pilot unit of wastewater treatment by carbon dioxide gas is presented.  A reactor pH is an important factor to enhance the gas absorption of carbon dioxide bubbles in an alkaline wastewater, and it needs to operate within a tight pH range.  Under a fed-batch operation mode, the reactor behavior has unstable dynamics resulting in a difficulty to achieve the pH target by manipulating the basic influent feed rate.  To solve the problem, an input/output (I/O) linearization is applied because it provides excellent the setpoint trackability with a few numbers of tuning parameters required. The first principles approach is employed for reactor modeling.  The model is then used in the I/O feedback formulation.  Control performance is evaluated through a real-time implementation to track the desired pH target in comparison with a two-degree-of-freedom control scheme used as a compared case.  The developed control system proficiently forces the output to the pH target and also improves the control performances.

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Author Biographies

Chanin Panjapornpon

1 Department of Chemical Engineering, Center of Excellence on Petrochemicals and Materials Technology, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand

2 The Center for Advanced Studies in Industrial Technology, Kasetsart University, Thailand

Pawat Saksomboon

1 Department of Chemical Engineering, Center of Excellence on Petrochemicals and Materials Technology, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand

2 The Center for Advanced Studies in Industrial Technology, Kasetsart University, Thailand

Kittayot Juyteiy

1 Department of Chemical Engineering, Center of Excellence on Petrochemicals and Materials Technology, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand

2 The Center for Advanced Studies in Industrial Technology, Kasetsart University, Thailand

Jedsada Chinprasit

1 Department of Chemical Engineering, Center of Excellence on Petrochemicals and Materials Technology, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand

2 The Center for Advanced Studies in Industrial Technology, Kasetsart University, Thailand

Published In
Vol 23 No 5, Sep 30, 2019
How to Cite
[1]
C. Panjapornpon, P. Saksomboon, K. Juyteiy, and J. Chinprasit, “Input/Output Linearization for a Real-Time pH Control: Application on Basic Wastewater Neutralization by Carbon Dioxide in a Fed-Batch Bubble Column Reactor”, Eng. J., vol. 23, no. 5, pp. 229-241, Sep. 2019.