Change search
ReferencesLink to record
Permanent link

Direct link
Nitrogen removal efficiency and nitrification rates at the Sequencing Batch Reactor in Nowy Targ, Poland.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
2008 (English)In: Vatten, ISSN 0042-2886, Vol. 64, no 2, 121-128 p.Article in journal (Refereed) Published
Abstract [en]

Biological nitrogen removal by the use of Sequencing Batch Reactors (SBR) is today an accepted and wellproven model. The Nowy Targ SBR plant has been in operation for 15 years, and comprehensive performancedata are available for assessment. This paper focuses on the 2005 year operation, characterised by high organicand nitrogen loading and also very high chromium loads. The available performance data allows an analysis ofboth nitrification rates and denitrification rates, along with an assessment of the temperature influence. Theresults reveal a high nitrification rate even at temperatures in the range 6–10°C, close to 2 g N/kg VSS/h, a clearrelation between nitrogen loading and nitrification as well as denitrification. Furthermore a relation betweenthe COD/N- ratio and the nitrification rate is found: the rate increases with decreasing COD/N-ratio.

Place, publisher, year, edition, pages
2008. Vol. 64, no 2, 121-128 p.
Keyword [en]
Nitrogen, Nitrogen removal, Nitrification rate, Denitrification rate, SBR
National Category
Other Environmental Engineering Water Engineering
URN: urn:nbn:se:kth:diva-14327OAI: diva2:332229
QC 20100803Available from: 2010-08-03 Created: 2010-08-03 Last updated: 2010-08-03Bibliographically approved
In thesis
1. SBR-technology - use and potential applications for treatment of cold wastewater
Open this publication in new window or tab >>SBR-technology - use and potential applications for treatment of cold wastewater
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Biological nutrient removal is used as an indicator of SBR performance at nine different SBRplants operated for a long period at low water temperatures (5 – 10oC). Typically needed aeratedSRT (Solids Residence Time) for complete nitrification is found to be in the range of 6 – 10 days.Biological phosphorus removal has been found to take place at 5oC.

The specific nitrification and denitrification rates (g N/kg VSS/h) have been found to besubstantially higher than those found in design recommendations. At temperatures < 10 oC thenitrification rates have been found up to 4 g Nox/kg VSS/h.

It has also been possible to establish a relation between the COD/N ratio and the nitrificationrate, showing that the rate increases to high rates when the ratio decreases.

Enhanced biological phosphorus removal has been demonstrated at two different plants even atlow water temperatures 5 – 7 oC.

Efficient biological nitrogen removal and phosphorus removal has been demonstrated at bothlow water temperatures and in presence of very high Chromium concentrations in inlet water, upto 20 mg Cr/l.

The plants operated with a short fill time in comparison with the total cycle time for the SBRprocess have all demonstrated good sludge settling properties, suggesting that the SBR processmay incorporate a good sludge selection performance.

Once a flexible operation strategy has been installed (in most cases through PLC systems) it hasbeen possible to meet load variations to maintain good treatment results. This has been found tobe true for most of the plants included in the thesis.

Finally, a modified way to assess the energy efficiency for the system is analysed and suggested.Instead of using the traditional ratio kWh/kg BODremoved the use of kWh/kg OCPremoved as a basisfor energy efficiency is used as a far more relevant efficiency measurement.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. xviii, 63 p.
Trita-LWR. PHD, ISSN 1650-8602 ; 1050
Intermittent operation, Water temperature, nitrogen, phosphorus, SBR, reaction rates
National Category
Other Environmental Engineering
urn:nbn:se:kth:diva-10550 (URN)978-91-7514-341-5 (ISBN)
Public defence
2009-06-03, Sal F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
QC 20100803Available from: 2009-05-26 Created: 2009-05-26 Last updated: 2010-08-03Bibliographically approved

Open Access in DiVA

No full text

Other links

tidskriften vatten

Search in DiVA

By author/editor
Morling, Stig
By organisation
Land and Water Resources Engineering
Other Environmental EngineeringWater Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 56 hits
ReferencesLink to record
Permanent link

Direct link