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Model-based control structure design of a full-scale WWTP under the retrofitting process.

V C Machado1, J Lafuente1, J A Baeza1

  • 1GENOCOV, Departament d'Enginyeria Química. Escola d'Enginyeria, Universitat Autònoma de Barcelona 08193, Bellaterra (Barcelona), Spain

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|June 4, 2015
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Summary

This study explored upgrading a wastewater plant to improve phosphorus removal. A model-predictive controller (MPC) in an anaerobic/anoxic/oxic (A2/O) setup offered the best performance and lowest costs.

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Process Control

Background:

  • The Manresa municipal wastewater treatment plant (WWTP) currently uses an anoxic-oxic (A/O) configuration.
  • Enhanced biological phosphorus removal (EBPR) is a key goal for improving effluent quality.
  • Existing control structures require redesign to manage phosphorus alongside traditional pollutants.

Purpose of the Study:

  • To evaluate the conversion of an A/O WWTP to an anaerobic/anoxic/oxic (A2/O) configuration.
  • To design and test advanced control structures for enhanced biological phosphorus removal.
  • To compare the performance and operating costs of different control strategies.

Main Methods:

  • Redesign of the WWTP control structure to include phosphorus concentration control.
  • Development and testing of decentralized control structures using proportional-integral-derivative (PID) controllers.
  • Development and testing of centralized control structures using model-predictive controllers (MPC).

Main Results:

  • The A2/O configuration with a centralized MPC (A2/O-3-MPC) demonstrated superior performance.
  • This control structure achieved the lowest operating costs.
  • The A2/O-3-MPC system provided the best effluent quality by controlling ammonium, nitrate, and phosphate levels.

Conclusions:

  • The A2/O configuration is effective for enhanced biological phosphorus removal.
  • Centralized model-predictive control offers significant advantages over decentralized PID control for WWTPs.
  • The A2/O-3-MPC strategy is optimal for the Manresa WWTP, balancing effluent quality and operational expenses.