Automatic control strategy for biological nitrogen removal of low C/N wastewater in a sequencing batch reactor

N. Kishida*, J. H. Kim, M. Chen, S. Tsuneda, Hi Sasaki, R. Sudo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

To establish an automatic control system of external carbon addition in biological nitrogen removal, a bench-scale sequencing batch reactor with real-time control strategy was designed in this study. An oxidation-reduction potential (ORP) profile was used for automatic control of external carbon addition. The mean removal efficiency of total organic carbon was over 98%. Complete denitrification in an anoxic phase and complete denitrification and nitrification in anoxic and oxic phases were accomplished, respectively, because the oxic and anoxic periods were also appropriately controlled with ORP and pH profiles, respectively. Mean removal efficiency of total nitrogen was over 95%. When concentration of influent wastewater was changed, volume of additional carbon was automatically changed with the influent fluctuation, and flexible hydraulic retention time was achieved in this system.

Original languageEnglish
Pages (from-to)45-50
Number of pages6
JournalWater Science and Technology
Volume50
Issue number10
Publication statusPublished - 2004 Dec 1

Keywords

  • C/N ratio
  • External carbon source
  • Oxidation-reduction potential(ORP)
  • Real-time control
  • pH

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

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