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Potential of activated sludge ozonation.

M Boehler1, H Siegrist

  • 1Eawag, Swiss Federal Institute of Aquatic Science and Technology, PO Box 611, CH-8600 Duebendorf, Switzerland. marc.boehler@eawag.ch

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|August 7, 2007
PubMed
Summary

Partial ozonation of return sludge reduces excess sludge production and improves wastewater treatment. This process aids phosphate recovery and enhances denitrification but requires careful management of nitrification stability.

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Area of Science:

  • Environmental Engineering
  • Wastewater Treatment Technologies
  • Resource Recovery

Background:

  • Stringent European regulations are limiting sewage sludge disposal and agricultural use.
  • Increased sludge incineration leads to high costs and loss of valuable phosphate resources.
  • There is a need for processes that reduce sludge production and enable phosphate recycling.

Purpose of the Study:

  • To investigate the impact of partial ozonation on excess sludge reduction in activated sludge systems.
  • To evaluate the effects of ozonation on sludge settling, bulking, scumming, and denitrification.
  • To assess the operational stability of nitrification and conduct an energy and cost evaluation of the ozonation process.

Main Methods:

  • Partial ozonation was applied to the return sludge of an activated sludge system.
  • Sludge settling properties, excess sludge production, and nitrification stability were monitored.
  • Denitrification potential and energy consumption were analyzed.

Main Results:

  • Partial ozonation significantly reduced excess sludge production and improved sludge settling.
  • Ozonation decreased sludge bulking and scumming, and enhanced denitrification through solubilised COD.
  • A potential decrease in nitrifier population was observed, impacting nitrification safety.

Conclusions:

  • Partial ozonation is a promising method for reducing excess sludge and recovering phosphate resources.
  • The process offers benefits for sludge settleability and denitrification but necessitates careful control of nitrification.
  • An energy and cost evaluation indicates the economic feasibility of implementing ozonation in wastewater treatment plants.