World Environmental and Water Resources Congress 2020
Small-Signal Modeling and Analysis of Electrodialysis Module Used for Desalination Processes
Publication: World Environmental and Water Resources Congress 2020: Water, Wastewater, and Stormwater and Water Desalination and Reuse
ABSTRACT
The available mathematical models of electrodialysis (ED) units are derived based on steady-state mass balance equations and solved with numerical methods. However, a dynamic model has never been developed before. This paper develops a small-signal model of a multicell stack ED based on state-space approach to study the effects of input salt concentration, feeding flow rate, and cell number on performance of the system. Desalination of saline water by electrodialysis is modeled based on separation of sodium ions. Dynamic models of mass balance equations with time-varying salt concentration gradient, varied with time, are considered in the modeling procedure. A 10-cell stack ED module with 9 cm2 of effective surface area is modeled to purify a feed stream containing 100 g/L of sodium chloride at the rate of 0.04 m/s.
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Information & Authors
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Published In
World Environmental and Water Resources Congress 2020: Water, Wastewater, and Stormwater and Water Desalination and Reuse
Pages: 31 - 41
Editors: Sajjad Ahmad, Ph.D., and Regan Murray, Ph.D.
ISBN (Online): 978-0-7844-8298-8
Copyright
© 2020 American Society of Civil Engineers.
History
Published online: May 14, 2020
Published in print: May 14, 2020
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