Model predictive control of pH neutralization processes: A review

Abstract

The paper provides a review of the different approaches of Model Predictive Control (MPC) to deal with the nonlinearities and transient behavior associated with pH and its control. Firstly a description of the pH system and what makes it difficult to control is presented, followed by the general description of the structure of MPC. The different applications of MPC vary mostly in the way the model is described and how the optimization is carried out to obtain the desired control action. The different modeling techniques applied to the MPC, which is used to describe the behavior of the pH are ranging from simple linear models, multiple linear models like piecewise linear descriptions and fuzzy models, to nonlinear descriptions like Wiener models and the use of artificial neural networks. The models and their respective ways of application are reviewed. Finally, the areas where more research is needed are addressed.

Model Predictive Control mit MATLAB® und Simulink®

“…Eine gute Übersicht über die Modellbildung und Regelung von pH-Systemen findet man in [101]. Ein umfangreiches Literaturverzeichnis zur MPC-Regelung von pH-Neutralisationsprozessen enthält [102].…”

Design and Implementation of a Novel Self-adaptive Fuzzy Logic Controller for a pH Neutralization Process

“…Moreover, both the steady-state and dynamic properties of the pH neutralization process are not linear which makes pH a benchmark problem often used by many researchers and engineers to define nonlinear model structures and control methods [5]. Process industries such as food and beverage processing, biotechnology, pharmaceutical, metal refineries, wastewater treatment and thermal power plants run several operations where both the pH monitoring and control are critical [6]. Most of these operations are performed to ensure both the standard quality products and the environmental requirements are not jeopardized [7].…”

“…Most of these operations are performed to ensure both the standard quality products and the environmental requirements are not jeopardized [7]. Although pH control is known to be a deterrent problem for all the aforementioned industries, its industrial significance makes it a fascinating subject for many researchers and engineers and has therefore received considerable attention in recent years [3,5,6].…”

Improving Process Management in a Water Treatment Plant Using Control Modelling

“…The pH neutralization process, or the control of pH, is a crucial task in wide industrial applications, such as chemical, biotechnological engineering, wastewater and water treatment plants (WTP). The pH, as a definition, is the logarithmic value of hydrogen ion activity in an aqueous solution or a measure of the acidity or alkalinity of a solution [1]. In terms of numerical values, a solution with a pH equal to 7 is neutral and for an alkalinity solution, this value is greater than 7.…”