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Advective flow in spherical floc.

Z Yang1, X F Peng, D J Lee

  • 1Department of Thermal Engineering, Tsinghua University, Beijing 100084, People's Republic of China.

Journal of Colloid and Interface Science
|February 6, 2007
PubMed
Summary
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This study reveals that simplified models for wastewater flocs (full term: flocs) are adequate for average properties but fail to capture complex internal flow patterns. Accurate hydrodynamic analysis requires detailed, real floc structural models.

Area of Science:

  • Environmental Engineering
  • Water Treatment
  • Microbial Ecology

Background:

  • Existing structural models (homogeneous, radially-varying) for flocs simplify intrafloc transport predictions.
  • These models are often used to understand advective flow within flocs in wastewater treatment.
  • The accuracy of these simplified models for complex floc structures is not fully understood.

Purpose of the Study:

  • To investigate the three-dimensional structure of original and chemically treated wastewater flocs.
  • To compare the predictive capabilities of simplified floc models versus a detailed model based on real floc structure.
  • To assess the impact of floc structure on intrafloc hydrodynamic modeling.

Main Methods:

  • Utilized fluorescence in situ hybridization (FISH) and confocal laser scanning microscopy (CLSM) to probe floc structure.

Related Experiment Videos

  • Constructed a spherical mesh model based on the experimentally determined real floc structure.
  • Performed simulations using both simplified and detailed structural models to analyze intrafloc flow patterns.

    • Main Results:

    • Homogeneous and radially-varying models adequately predict average floc characteristics like porosity and drag for compacted flocs.
    • Detailed flow patterns within real flocs are significantly more tortuous than predicted by simplified models.
    • Simplified models fail to accurately represent the local hydrodynamic environment within flocs.

    Conclusions:

    • Simplified floc models are suitable for predicting average properties but insufficient for detailed hydrodynamic analysis.
    • A complex structural model derived from real floc architecture is necessary for accurate local hydrodynamic environment predictions.
    • Understanding intrafloc transport requires models that account for the tortuous nature of real floc structures.