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Simultaneous model of chlorine dosing and decay in drinking water distribution system and model predictive control application
Author(s) -
Muslim Abrar,
Li Qin,
Tadé Moses O.
Publication year - 2008
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.132
Subject(s) - robustness (evolution) , model predictive control , hypochlorous acid , chlorine , control theory (sociology) , matlab , computer science , process engineering , engineering , control (management) , chemistry , biochemistry , organic chemistry , artificial intelligence , gene , operating system
The most commonly applied active disinfectant in drinking water distribution system (DWDS) is free chlorine residual (FCR) in the form of hypochlorous acid and hypochlorite ion. The concentration of FCR decreases along the transport pipeline. Controlled replenishment of chlorine at various sites in DWDS is critical to maintain the FCR in the safe range of 0.2–0.6 ppm. This study proposed a multiple‐input multiple‐output (MIMO) model (developed in Simulink of Matlab 7.0.1) that simultaneously takes into account chlorine dosing and decay process with the considerations of process disturbances. The model is further implemented into a centralised model predictive control (CMPC) system. The advantages of our CMPC system in controlling multiple outputs are its robustness and short settling time, compared to the conventional process‐data‐based proportional integral (PI) control strategies. Moreover, the simplicity of this reactive‐transport‐model‐based MIMO control system and the use of Matlab promise an easy adaptation to field test and plant implementation. It addresses an important need in water quality management, particularly for developing countries. Copyright © 2008 Curtin University of Technology and John Wiley & Sons, Ltd.