An Industrial Application of Reference System Synthesis/Generic Model Control: Wastewater pH Control

  • Peter L. Lee
Part of the Advances in Industrial Control book series (AIC)


A nonlinear controller designed by reference system synthesis was applied to control the pH of wastewater being discharged from a petrochemical plant. A first principles model was developed based on a set of simplifying assumptions, and validated against plant data. The controller was implemented as a Fortran program in a PMX computer linked to TDC2000. The results were the essentially complete elimination of the need for manual intervention when major disturbances arose, and significantly improved control within the regulatory consent limits for effluent pH.


Neutral Zone Nonlinear Controller Linear Controller Neutralize Agent Load Disturbance 
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  1. Bartusiak R.D., Georgakis C. and Reilly Mi. (1989) Nonlinear feedforward/feedback control structures designed by reference system synthesis. Chem. Eng. Sci. 44(9):1837–1851.CrossRefGoogle Scholar
  2. Bequette B.W. (1991) Nonlinear process control: A review. Ind. Eng. Chem. Res. 30: 1391–1413CrossRefGoogle Scholar
  3. Gustafsson T.K. and Waller K.V. (1992) Nonlinear and adaptive control of pH. Ind. Eng. Chem. Res. 31:2681–2693.CrossRefGoogle Scholar
  4. Lee P.L. and Sullivan G.R. (1988) Generic Model Control (GMC). Comput Chem. Eng. 12:573–580.CrossRefGoogle Scholar
  5. Luyben W.L. (1990) Process Modelling, Simulation and Control for Chemical Engineers. McGraw-Hill, New York.Google Scholar
  6. Parrish J.R. and Brosilow C.B. (1988) Nonlinear inferential control. AIChEJ. 34 (4):633–644.CrossRefGoogle Scholar
  7. Shinskey F.G. (1988) Process Control Systems: Application, Design and Tuning. McGraw-Hill, New YorkGoogle Scholar
  8. Williams G.L., Rhinehart R.R. and Riggs J.B. (1990) In-line process-modelbased control of wastewater pH using dual base injection. Ind. Eng. Chem. Res. 29:1254–1259.CrossRefGoogle Scholar
  9. Wright R.A. and Kravaris C. (1991) Nonlinear control of pH processes using the strong acid equivalent. Ind. Eng. Chem. Res. 30: 1561–1572.CrossRefGoogle Scholar

Copyright information

© Springer-Verlag London Limited 1993

Authors and Affiliations

  • Peter L. Lee
    • 1
  1. 1.Department of Chemical EngineeringThe University of QueenslandAustralia

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