A spectral in-situ UV sensor was investigated to measure nitrite and nitrate concentrations in the effluent of the EAWAG pilot-scale plant. The sensor was used with a calibration that was based on data from another WWTP and was operated over a period of 1.5 years. The results showed constant accuracy although the sensor was operated with minimal maintenance (manual cleaning once a month). It could be shown that the sensor was able to accurately predict the nitrite and nitrate concentration with a precision of 0.32 mg N/l (95% prediction interval at mean lab value of 1.15 mg N/l) and 1.08 mg N/l (at 5.55 mg N/l) for nitrite and nitrate, respectively. The UV sensor showed good results for nitrite in the low concentration range and very accurate results for higher concentrations (up to 10 mg N/l). This allows using the sensor for alarm systems as well as for control concepts at WWTPs.
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Research Article|
May 01 2008
Long-term evaluation of a spectral sensor for nitrite and nitrate
L. Rieger
;
1modelEAU, Département de génie civil, Pavillon Pouliot, Université Laval, Québec, QC , G1K 7P4, Canada E-mail: leiv.rieger@gci.ulaval.ca; peter.vanrolleghem@gci.ulaval.ca
E-mail: leiv.rieger@gci.ulaval.ca
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P. A. Vanrolleghem
;
P. A. Vanrolleghem
1modelEAU, Département de génie civil, Pavillon Pouliot, Université Laval, Québec, QC , G1K 7P4, Canada E-mail: leiv.rieger@gci.ulaval.ca; peter.vanrolleghem@gci.ulaval.ca
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G. Langergraber
;
G. Langergraber
2Institute of Sanitary Engineering and Water Pollution Control, University of Natural Resources and Applied Life Sciences, Vienna (BOKU), Muthgasse 18, A-1190, Vienna, Austria E-mail: guenter.langergraber@boku.ac.at
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D. Kaelin
;
D. Kaelin
3EAWAG, Swiss Federal Institute of Aquatic Science and Technology, Ueberlandstr. 133, PO Box 611, 8600, Duebendorf, Switzerland E-mail: david.kaelin@eawag.ch; hansruedi.siegrist@eawag.ch
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H. Siegrist
H. Siegrist
3EAWAG, Swiss Federal Institute of Aquatic Science and Technology, Ueberlandstr. 133, PO Box 611, 8600, Duebendorf, Switzerland E-mail: david.kaelin@eawag.ch; hansruedi.siegrist@eawag.ch
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Water Sci Technol (2008) 57 (10): 1563–1569.
Citation
L. Rieger, P. A. Vanrolleghem, G. Langergraber, D. Kaelin, H. Siegrist; Long-term evaluation of a spectral sensor for nitrite and nitrate. Water Sci Technol 1 May 2008; 57 (10): 1563–1569. doi: https://doi.org/10.2166/wst.2008.146
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