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Related Experiment Videos

Robustness and economic measures as control benchmark performance criteria.

P A Vanrolleghem1, S Gillot

  • 1BIOMAT, Ghent University, Gent, Belgium.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|April 9, 2002
PubMed
Summary

New multi-criteria measures, including a Total Cost Index (TCI) and Robustness Index (RI), effectively evaluate wastewater treatment control strategies. A simple dissolved oxygen control strategy proved most effective in the benchmark study.

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Area of Science:

  • Environmental Engineering
  • Process Control
  • Wastewater Treatment

Background:

  • Evaluating control strategies in wastewater treatment is complex, often relying on multi-criteria decision-making.
  • Existing methods like grey-scale presentations struggle to reflect the relative importance of different evaluation criteria.
  • The Benchmark protocol is a standard for comparing control strategies, but requires robust evaluation metrics.

Purpose of the Study:

  • To introduce and assess novel multi-criteria measures for evaluating wastewater treatment control strategies.
  • To compare the effectiveness of a proposed Total Cost Index (TCI) and Robustness Index (RI) against traditional methods.
  • To identify an optimal control strategy for aerated reactors within the Benchmark protocol framework.

Main Methods:

Related Experiment Videos

  • Development of a Total Cost Index (TCI) incorporating weighted investment and operating costs.
  • Introduction of a Robustness Index (RI) to assess control strategy transferability to varied conditions.
  • Application of these indices to evaluate respirometry-based control strategies using a case study within the Benchmark protocol.

Main Results:

  • The Total Cost Index (TCI) demonstrated superior power in evaluating control strategies compared to grey-scale methods.
  • The Robustness Index (RI) effectively quantified the transferability of control strategies.
  • A simple control strategy involving dissolved oxygen control in all aerated reactors emerged as the most effective evaluated strategy.

Conclusions:

  • The proposed multi-criteria measures (TCI and RI) offer a more powerful and practical approach to evaluating control strategies.
  • Replacing the open-loop benchmark reference with a dissolved oxygen-controlled plant is advisable for more effective evaluations.
  • The simple dissolved oxygen control strategy represents a highly effective and transferable solution for wastewater treatment.