Fast start-up and controlled operation during a long-term period of a high-rate partial nitrification activated sludge system

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Abstract

Partial nitrification of a high-strength ammonium wastewater (1150±150 mg N-NH 4+ L -1), mimicking reject water, was achieved in an activated sludge pilot plant with a configuration of three continuous reactors in series plus a settler. Stable and robust partial nitrification was maintained during 800 days of operation at 30°C with a sludge retention time (SRT) of 8±3 days. A high volumetric ammonium oxidation rate (2.0gNL -1 d -1) was obtained with a [N-NO 2-]/[N-NO x-] ratio of 1, i.e. full nitritation. The start-up of the partial nitrification system was quickly and successfully performed with an on-line control system using municipal wastewater treatment plant (WWTP) sludge as inoculum. An ammonia-oxidizing bacteria (AOB) fraction of 72±10% was obtained after only 30 days of start-up. The applied SRT of 7-10 days with the combination of free ammonia inhibition and dissolved oxygen limitation provided the selective washout of nitrite-oxidizing bacteria (NOB) and an active nitrifying population with high ammonium oxidizing rates. © 2012 Taylor & Francis.
Original languageEnglish
Pages (from-to)1361-1366
JournalEnvironmental Technology (United Kingdom)
Volume33
Issue number12
DOIs
Publication statusPublished - 1 Jun 2012

Keywords

  • Control
  • Nitritation
  • NOB washout
  • SRT
  • Start-up

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