Long-term evaluation of a spectral sensor for nitrite and nitrate
Abstract: 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 0.32mgN/l (95%prediction interval at mean lab value of 1.15mgN/l) and 1.08mg N/l (at 5.55mgN/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 10mgN/l). This allows using the sensor for alarm systems as well as for control concepts at WWTPs.
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