Control of a reverse osmosis desalination process at high recovery

Author

McFall, Charles W. ; Bartman, Alex ; Christofides, Panagiotis D. ; Cohen, Yoram

Author_Institution

Dept. of Chem. & Biomol. Eng., Univ. of California, Los Angeles, CA

fYear

2008

fDate

11-13 June 2008

Firstpage

2241

Lastpage

2247

Abstract

Feed-forward/feedback control techniques that utilize Lyapunov-based control laws are implemented on a high recovery reverse osmosis desalination plant model. A detailed mathematical model of a high recovery reverse osmosis plant is developed. This model incorporates the large spatial variations of concentration and flow-rate that occur in membrane units during high recovery operation. Bounded nonlinear feedback and feed-forward controllers are developed and applied to this system. The application of these controllers is demonstrated in the context of a high recovery reverse osmosis process simulation. The scenarios demonstrate the ability to compensate for the effects of large time varying disturbances in the feed concentration on specific process outputs with feedforward/feedback control.

Keywords

Lyapunov methods; desalination; feedback; feedforward; nonlinear control systems; reverse osmosis; stability; time-varying systems; Lyapunov-based control; bounded nonlinear feedback controllers; feed concentration; feedforward control; high recovery reverse osmosis desalination plant model; mathematical model; membrane concentration; membrane flow-rate; recovery operation; spatial variation; time varying disturbance; Biomembranes; Context modeling; Control systems; Desalination; Feedback control; Feedforward systems; Feeds; Mathematical model; Nonlinear control systems; Reverse osmosis;

fLanguage

English

Publisher

ieee

Conference_Titel

American Control Conference, 2008

Conference_Location

Seattle, WA

ISSN

0743-1619

Print_ISBN

978-1-4244-2078-0

Electronic_ISBN

0743-1619

Type

conf

DOI

10.1109/ACC.2008.4586825

Filename

4586825