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Aerobic transformations in sewer systems: are they relevant?

C Flamink1, J Langeveld, F Clemens

  • 1Delft University of Technology (TUDelft), Faculty of Civil Engineering and Geosciences, Section of Sanitary Engineering, P.O. Box 5048, NL-2600 GA Delft, The Netherlands. c.m.l.flamink@citg.tudelft.nl

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|October 7, 2005
PubMed
Summary

Aerobic wastewater transformations in sewers are typically too slow to impact quality during normal flow. However, these processes can be significant during long aerobic transport times, and the ASM1 model accurately simulates dissolved oxygen changes.

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Area of Science:

  • Environmental Engineering
  • Wastewater Treatment
  • Environmental Chemistry

Background:

  • In-sewer processes significantly alter wastewater quality, particularly during dry weather flow (DWF).
  • Understanding aerobic transformation rates is crucial for managing wastewater quality within sewer systems.

Purpose of the Study:

  • To quantify aerobic transformation rates in sewer systems.
  • To assess the relevance of these transformations concerning influent fluctuations in Dutch wastewater systems.
  • To evaluate the applicability of an ASM1-based model for simulating these processes.

Main Methods:

  • Oxygen mass balance calculations over a sewer reach.
  • Installation of oxygen probes at upstream and downstream locations.
  • Measurement of oxygen uptake rate and water quality parameters (COD, ammonium) from wastewater samples.

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Main Results:

  • Aerobic transformation rates are significantly slower than COD concentration fluctuations in typical sewer systems.
  • Aerobic conversions become significant only under conditions of very long aerobic transport times.
  • An ASM1-based sewer model demonstrated good agreement with measured dissolved oxygen levels.

Conclusions:

  • Aerobic transformations are generally not a primary factor influencing influent fluctuations in Dutch wastewater systems.
  • The ASM1 model is suitable for describing dissolved oxygen dynamics in aerobic sewer reaches.
  • Long aerobic transport times necessitate consideration of aerobic conversion impacts.