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Biological nitrogen removal at low water temperatures - long term experience
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering (moved 20130630), Water, Sewage and Waste technology.
2011 (English)In: DESALINATION AND WATER TREATMENT, ISSN 1944-3994, Vol. 25, no 1-3, 226-232 p.Article in journal (Refereed) Published
Abstract [en]

Many earlier publication presented the lowest temperature of 10 degrees C as feasible for nitrification process. The article evaluates long-term experience with biological nitrogen removal at low temperatures (between 2 and 10 degrees C), studied at four wastewater treatment plants operated with SBR-technology: Holbaek (Denmark), Nowy Targ (Poland), Nynashamn and Skaulo (Sweden). Influence if nitrogen loads and COD/N ratio on nitrification rate was studied. Despite of operation at low temperatures during 3-4 months of the year good relation between the nitrogen load and the specific nitrification rate has been obtained. Long-term studies regarding nitrification, temperature and SRT demonstrated that the actually needed (aerated) SRT were lower than the normally recommended values. In some cases the nitrification was maintained at a lower efficiency even during non-aerated phases due to remaining free oxygen in the reactor that is used for nitrification.

Place, publisher, year, edition, pages
2011. Vol. 25, no 1-3, 226-232 p.
Keyword [en]
Nitrogen removal, SBR, Low water temperature, Solids retention time
National Category
Water Engineering
URN: urn:nbn:se:kth:diva-30555DOI: 10.5004/dwt.2011.1928ISI: 000286437700029ScopusID: 2-s2.0-79251475574OAI: diva2:401175
QC 20110301Available from: 2011-03-01 Created: 2011-02-28 Last updated: 2011-03-01Bibliographically approved

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