N-removal on wastewater treatment plants: a process control approach

Ramon Vilanova, M.R. Katebi, NoraLiza Wahab

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A multilayered control design approach is proposed here. Starting with the Dissolved Oxygen (DO) control loop in the last aerated tank, the control of the recirculation sludge is added next. Once the limitations of this two-loop control strategy are highlighted, a cascade control loop is proposed. This cascade control is further enhanced by a feed-forward control action that makes use of influent ammonia concentration. The resulting cascade+feedforward control configuration achieves satisfactory nitrogen removal for the three influent op-erating conditions (dry, rain and storm).
Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalJournal of Water Resource and Protection
Issue number3
Early online date1 Jan 2011
Publication statusPublished - 2011


  • n-removal
  • wastewater treatment plants
  • process control approach
  • effluent quality
  • nitrogen removal
  • activated sludge process
  • energy cost
  • wastewater process control
  • PID Control

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