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Related Experiment Videos

BOD5 estimation for pulp and paper mill effluent using UV absorbance.

F M Muzio1, H M Budman, C W Robinson

  • 1Department of Chemical Engineering, University of Waterloo, Waterloo, Ont., Canada N2L 3G1.

Water Research
|May 2, 2001
PubMed
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A new UV absorbance method estimates Biochemical Oxygen Demand (BOD5) in pulp and paper mill effluent. While reasonable for reactor influent, it was inaccurate for final effluent, limiting its process control use.

Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Industrial Chemistry

Background:

  • Accurate monitoring of Biochemical Oxygen Demand (BOD5) is crucial for managing pulp and paper mill effluent.
  • Existing BOD5 measurement methods can be time-consuming, hindering real-time process control.
  • UV absorbance offers a potential rapid alternative for BOD5 estimation.

Purpose of the Study:

  • To present and evaluate a novel UV absorbance-based method for estimating BOD5 in pulp and paper mill effluent.
  • To assess the method's suitability for on-line sensor incorporation and process control applications.
  • To investigate the method's performance across different pulping processes (Kraft and thermo-mechanical).

Main Methods:

  • UV absorbance measurements were taken across the 200-350 nm range for reactor influent and final effluent samples from two mills.

Related Experiment Videos

  • Separate correlations were developed to relate UV absorbance to BOD5 for each mill due to distinct pulping processes.
  • The effect of aeration on BOD5 results at low values was also examined for the Kraft mill.

    • Main Results:

    • Significant differences in UV absorbance spectra were observed between the Kraft and thermo-mechanical mills.
    • The UV absorbance method provided reasonable predictions for BOD5 at the reactor entrance.
    • Predictions for final effluent BOD5 were inaccurate for both mills, indicating limitations for this stream.

    Conclusions:

    • The UV absorbance method shows promise for estimating influent BOD5 in pulp and paper mills.
    • The method's inaccuracy for final effluent limits its current application for comprehensive process control.
    • Further refinement is needed to improve the accuracy of final effluent BOD5 prediction using UV absorbance.