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Related Experiment Videos

Micro-profiles of activated sludge floc determined using microelectrodes.

Baikun Li1, Paul L Bishop

  • 1Department of Civil and Environmental Engineering, University of Cincinnati, 765G Baldwin Hall, Cincinnati, OH 45221-0071, USA.

Water Research
|February 21, 2004
PubMed
Summary
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Microbial oxygen use limits aerobic zones in activated sludge flocs, creating anoxic zones crucial for wastewater treatment. Higher dissolved oxygen levels reduce these anoxic zones, enhancing biodegradation.

Area of Science:

  • Environmental Microbiology
  • Environmental Engineering
  • Wastewater Treatment

Background:

  • Activated sludge floc microbial activity is vital for wastewater treatment efficiency.
  • Understanding the microenvironment within flocs is key to process optimization.
  • Wastewater characteristics significantly influence microbial processes in activated sludge.

Purpose of the Study:

  • To investigate the microenvironment of activated sludge flocs from two wastewater treatment plants with varying influent COD.
  • To correlate bulk wastewater contaminant concentrations with oxygen penetration and redox potential within flocs.
  • To analyze the impact of dissolved oxygen on anoxic zones and biodegradation within activated sludge.

Main Methods:

  • Utilized microelectrodes to study the microenvironment of activated sludge flocs.

Related Experiment Videos

  • Compared flocs from Mill Creek (high COD) and Muddy Creek (low COD) wastewater treatment plants.
  • Analyzed oxygen consumption, nitrification rates, and nitrate concentration profiles.

    • Main Results:

    • Aerobic regions in flocs were limited to the surface (0.1-0.2mm) at high COD, confirming internal anoxic zones.
    • Increased bulk dissolved oxygen (>4.0 mg/L) eliminated internal anoxic zones, promoting biodegradation.
    • Lower COD resulted in higher internal redox potential and dissolved oxygen within flocs.
    • Nitrate decreased within flocs despite bulk nitrification; ammonia flux correlated with nitrification.

    Conclusions:

    • Wastewater contaminant concentration directly impacts oxygen utilization and penetration within activated sludge flocs.
    • The presence and extent of anoxic zones within flocs are influenced by bulk dissolved oxygen levels.
    • Microbial metabolic mechanisms vary between treatment plants, affecting internal oxygen flux and overall treatment efficacy.