Abstract A submersible UV/VIS spectrometer was used to monitor a paper mill wastewater treatment plant.
It utilises the UV/VIS range (200–750 nm) for simultaneous measurement of COD, filtered COD, TSS and
nitrate with just a single instrument. The instrument measures in-situ, directly in the process. Paper mill
wastewater shows typical and reproducible spectra at various process measuring points. There is a relative
maximum at 280 mm due to the absorbance by dissolved organic substances, mainly ligninic acids.
Comparison of absorbance spectra distinctly shows the decrease of this peak, indicating biological
degradation throughout the treatment process. Summarising, one can say that paper mill wastewater cannot
be monitored by a simple UV probe measuring only the absorbance at a single wavelength. The required
information can only be gained from the whole spectra. Regarding plant control it is suggested that only the
overall spectral information is used. Calibrations to conventional parameters are now merely carried out for
purposes of reference-checking.
Abstract A submersible UV/VIS spectrometer was used to monitor a paper mill wastewater treatment plant.It utilises the UV/VIS range (200–750 nm) for simultaneous measurement of COD, filtered COD, TSS andnitrate with just a single instrument. The instrument measures in-situ, directly in the process. Paper millwastewater shows typical and reproducible spectra at various process measuring points. There is a relativemaximum at 280 mm due to the absorbance by dissolved organic substances, mainly ligninic acids.Comparison of absorbance spectra distinctly shows the decrease of this peak, indicating biologicaldegradation throughout the treatment process. Summarising, one can say that paper mill wastewater cannotbe monitored by a simple UV probe measuring only the absorbance at a single wavelength. The requiredinformation can only be gained from the whole spectra. Regarding plant control it is suggested that only theoverall spectral information is used. Calibrations to conventional parameters are now merely carried out forpurposes of reference-checking.
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