Global internal recirculation alternative operation to reduce nitrogen and ammonia limit violations and pumping energy costs in wastewater treatment plants

Ignacio Santín*, Ramon Vilanova, Carles Pedret, Marian Barbu

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The internal recirculation plays an important role in different areas of the biological treatment of wastewater treatment plants because it has a great influence on the concentration of pollutants, especially nutrients. A usual manipulation of the internal recirculation flow rate is based on the target of controlling the nitrate concentration in the last anoxic tank. This work proposes an alternative for the manipulation of the internal recirculation flow rate instead of nitrate control, with the objective of avoiding limit violations of nitrogen and ammonia concentrations and reducing operational costs. A fuzzy controller is proposed to achieve it based on the effects of the internal recirculation flow rate in different areas of the biological treatment. The proposed manipulation of the internal recirculation flow rate is compared to the application of the usual nitrate control in an already established and published operation strategy by using the internationally known benchmark simulation model no. 2 as a working scenario. The results show improvements with reductions of 59.40% in ammonia limit violations, 2.35% in total nitrogen limit violations, and 38% in pumping energy costs.

Original languageEnglish
Article number1606
Pages (from-to)1-13
Number of pages13
JournalProcesses
Volume8
Issue number12
DOIs
Publication statusPublished - Dec 2020

Keywords

  • Benchmark simulation model no. 2
  • Control strategies
  • Fuzzy control
  • Wastewater treatment plant

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