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Nutrient release from extracted activated sludge cells using the microwave enhanced advanced oxidation process.

Yang Yu1, Ing W Lo, Winnie W I Chan

  • 1Department of Civil Engineering, University of British Columbia, Vancouver, British Columbia, Canada.

Journal of Environmental Science and Health. Part A, Toxic/Hazardous Substances & Environmental Engineering
|June 8, 2010
PubMed
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Microwave-enhanced advanced oxidation effectively destroys EPS-free activated sludge cells, releasing nutrients like ammonia and orthophosphate. Higher temperatures and hydrogen peroxide (H(2)O(2)) doses increase nutrient release and cell damage, indicated by DNA release.

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Area of Science:

  • Environmental Science
  • Water Treatment Technologies
  • Advanced Oxidation Processes

Background:

  • Activated sludge is a key component in biological wastewater treatment.
  • Extracellular polymeric substances (EPS) can hinder sludge treatment processes.
  • Understanding cell destruction mechanisms is crucial for efficient sludge management.

Purpose of the Study:

  • To evaluate the microwave-enhanced advanced oxidation process (MW/H(2)O(2)-AOP) for nutrient release and cell destruction.
  • To investigate the impact of microwave temperature and hydrogen peroxide (H(2)O(2)) dosage on EPS-free activated sludge cells.
  • To determine the efficiency of MW/H(2)O(2)-AOP in breaking down sludge cell structures.

Main Methods:

  • EPS-free activated sludge cells were subjected to MW/H(2)O(2)-AOP.
  • Varying microwave temperatures and H(2)O(2) dosages were applied.
  • Nutrient concentrations (ammonia, orthophosphate, soluble chemical oxygen demand), carbohydrate release, and DNA concentration were measured.

Main Results:

  • Ammonia and soluble chemical oxygen demand increased with higher microwave temperatures and H(2)O(2) dosages.
  • Orthophosphate was released at lower temperatures and H(2)O(2) dosages compared to previous studies.
  • Carbohydrate release increased with temperature, showing a dose-dependent response to H(2)O(2).
  • High DNA concentrations in the solution indicated significant cell damage.

Conclusions:

  • MW/H(2)O(2)-AOP is effective for nutrient release and cell destruction of EPS-free activated sludge.
  • Process parameters (temperature, H(2)O(2) dose) significantly influence nutrient release and cell lysis.
  • DNA release serves as a reliable indicator of cell damage extent during the process.