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Related Experiment Videos

Comparative investigations on COD-removal in sequencing batch reactors and continuous flow plants.

T Dockhorn1, N Dichtl, R Kayser

  • 1Institute of Sanitary Engineering, PO Box 3329, Technical University of Braunschweig, D-38023 Braunschweig, Germany.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|May 31, 2001
PubMed
Summary

Enhanced chemical oxygen demand (COD) removal from wastewater is best achieved with reactor designs that approach plug flow characteristics. Higher temperatures and lower sludge loads further improve COD removal efficiency.

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Wastewater Management

Background:

  • Municipal wastewater treatment aims to reduce pollutants like chemical oxygen demand (COD).
  • Reactor mixing characteristics significantly impact treatment efficiency and effluent quality.
  • Understanding these impacts is crucial for optimizing wastewater treatment processes.

Purpose of the Study:

  • To investigate the influence of reactor mixing characteristics on COD removal from municipal wastewater.
  • To compare the performance of three different pilot-scale reactor types: completely mixed, cascade, and sequencing batch reactor (SBR).
  • To determine the theoretical basis for COD elimination by combining kinetics and mixing models.

Main Methods:

  • Parallel operation of three pilot plants (completely mixed, cascade, SBR) under identical conditions.

Related Experiment Videos

  • Investigations conducted at various sludge ages and temperatures.
  • Dynamic simulation calculations integrating growth kinetics and reactor mixing characteristics.

    • Main Results:

    • COD removal efficiency increased as mixing characteristics approached plug flow.
    • Higher temperatures correlated with improved COD removal.
    • A significant negative correlation was found between sludge load and COD removal efficiency.
    • The SBR reactor demonstrated excellent performance under the tested conditions.

    Conclusions:

    • Reactor design, specifically mixing patterns, is a key factor in enhancing COD removal.
    • Plug flow characteristics and higher temperatures optimize wastewater treatment.
    • Sludge load management is critical for minimizing effluent COD concentrations.