Long term partial nitritation of anaerobically treated black water and the emission of nitrous oxide

M.S. de Graaff, G. Zeeman, B.G. Temmink, M.C.M. Loosdrecht, C.J.N. Buisman

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55 Citations (Scopus)

Abstract

Black water (toilet water) contains half the load of organic material and the major fraction of the nutrients nitrogen and phosphorus in a household and is 25 times more concentrated, when collected with a vacuum toilet, than the total wastewater stream from a Dutch household. This research focuses on the partial nitritation of anaerobically treated black water to produce an effluent suitable to feed to the anammox process. Successful partial nitritation was achieved at 34 °C and 25 °C and for a long period (almost 400 days in the second period at 25 °C) without strict process control a stable effluent at a ratio of 1.3 NO2-N/NH4-N was produced which is suitable to feed to the anammox process. Nitrite oxidizers were successfully outcompeted due to inhibition by free ammonia and nitrous acid and due to fluctuating conditions in SRT (1.0–17 days) and pH (from 6.3 to 7.7) in the reactor. Microbial analysis of the sludge confirmed the presence of mainly ammonium oxidizers. The emission of nitrous oxide (N2O) is of growing concern and it corresponded to 0.6–2.6% (average 1.9%) of the total nitrogen load
Original languageEnglish
Pages (from-to)2171-2178
JournalWater Research
Volume44
Issue number7
DOIs
Publication statusPublished - 2010

Keywords

  • sewage effluent
  • sewage
  • excreta
  • households
  • effluents
  • new sanitation
  • waste water treatment
  • nitrification
  • ammonium
  • anaerobic treatment
  • anammox reactor
  • waste-water
  • start-up
  • removal
  • ammonia
  • sharon
  • supernatant
  • management
  • digestion

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