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Run-to-run control of membrane filtration processes

Authors

  • Jan Busch,

    1. Lehrstuhl für Prozesstechnik, RWTH Aachen University, Turmstraße 46, D-52064 Aachen, Germany
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  • Andreas Cruse,

    Corresponding author
    1. Lehrstuhl für Prozesstechnik, RWTH Aachen University, Turmstraße 46, D-52064 Aachen, Germany
    Current affiliation:
    1. Uhde GmbH, Friedrich-Uhde-Str. 15, D-44141 Dortmund, Germany
    • Lehrstuhl für Prozesstechnik, RWTH Aachen University, Turmstraße 46, D-52064 Aachen, Germany
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  • Wolfgang Marquardt

    Corresponding author
    1. Lehrstuhl für Prozesstechnik, RWTH Aachen University, Turmstraße 46, D-52064 Aachen, Germany
    • Lehrstuhl für Prozesstechnik, RWTH Aachen University, Turmstraße 46, D-52064 Aachen, Germany
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Abstract

Membrane filtration processes are often operated cyclically, where one cycle comprises a filtration and a backwashing phase. Due to the complex mechanisms involved, these processes are mostly operated with fixed values of the manipulated variables, leaving much of the economical potential unexplored. A model-based run-to-run process control approach is introduced, in which the manipulated variables are optimized after each filtration cycle. The approach is evaluated in a case study on submerged membrane filtration in wastewater treatment. A simple, computationally inexpensive process model is developed. The resulting model-based controller is tested in a simulation environment employing a validated reference model. It yields excellent results with respect to prediction quality and optimization results. © 2007 American Institute of Chemical Engineers AIChE J, 2007

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