Spectral in-situ analysis of NO2, NO3, COD, DOC and TSS in the effluent of a WWTP
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Author (Corporation)
Publication date
2004
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01A - Journal article
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Water Science and Technology
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Volume
50
Issue / Number
11
Pages / Duration
143-152
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IWA Publishing
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Abstract
An in-situ UV spectrometer was applied to the effluent of a WWTP in Switzerland and calibrated using a multivariate calibration algorithm based on PLS regression. Except for nitrite, the calibration was based on comparative measurements of the effluent in the plant laboratory. Samples made of stock solution added to three different matrices prepared in the EAWAG laboratory were used for the nitrite calibration because the effluent concentrations were always in the range of 0.06–0.26 mg/l. The results show very good precision for nitrite and nitrate. The measuring range for COD and DOC was not completely covered by the measurements, so the meaningfulness of the results is limited. Nevertheless the precision obtained for soluble COD is high enough for most applications at WWTPs. The accuracy of the TSS measurement is unsatisfactory as regards effluent limits since the spectrometer used does not cover the wavelength region up to 700 nm, which gives better signals for TSS calibration due to its strong correlation with turbidity.
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ISBN
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0273-1223
1996-9732
1996-9732
Language
English
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No
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Published
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Closed
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Citation
Rieger, L., Langergraber, G., Thomann, M., Fleischmann, N., & Siegrist, H. (2004). Spectral in-situ analysis of NO2, NO3, COD, DOC and TSS in the effluent of a WWTP. Water Science and Technology, 50(11), 143–152. https://doi.org/10.2166/wst.2004.0682