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Density effects on activated sludge zone settling velocities.

Andrew J Schuler1, Hoon Jang

  • 1Department of Civil and Environmental Engineering, Duke University, Box 90287, Durham, NC 27701, USA. aschuler@duke.edu

Water Research
|March 14, 2007
PubMed
Summary
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Adding microspheres to activated sludge increased settling velocity up to fivefold by manipulating biomass density. This research offers new models for predicting settling performance in wastewater treatment systems.

Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Biomass Characterization

Background:

  • Activated sludge processes are crucial for wastewater treatment.
  • Understanding biomass settling is key to optimizing clarifier performance.
  • Biomass density is a critical factor influencing settling velocity.

Purpose of the Study:

  • To investigate the impact of biomass density on zone settling velocities.
  • To evaluate the effects of density on parameters of the Vesilind sedimentation model.
  • To develop new models for predicting settling velocity based on density and concentration.

Main Methods:

  • Utilized a novel method involving synthetic microspheres to control biomass density.
  • Tested samples from full-scale activated sludge plants.

Related Experiment Videos

  • Analyzed settling velocities across a range of biomass densities and concentrations.

    • Main Results:

    • Settling velocities increased up to fivefold with increased biomass density.
    • The Vesilind model parameter V(o) positively correlated with density (>1.02 g/mL).
    • The Vesilind model parameter k remained relatively constant in the same density range.

    Conclusions:

    • Biomass density significantly influences activated sludge settling velocity.
    • Developed models incorporating density and concentration can improve clarifier performance predictions.
    • These models are particularly valuable when biomass characteristics affecting density are variable.