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Rheological characterization of digested sludge by solid sphere impact.

Jiankai Jiang1, Jing Wu2, Souhila Poncin3

  • 1Laboratory of Reactions and Process Engineering, University of Lorraine, CNRS, 1, rue Grandville, BP 20451, 54001 Nancy Cedex, France; CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, China.

Bioresource Technology
|July 4, 2016
PubMed
Summary

This study introduces a novel impact method to analyze digested sludge rheology. The technique effectively measures sludge viscoelasticity, offering insights into its dynamic behavior after impact.

Keywords:
CraterDigested sludgeHigh-speed cameraImpact methodRheological characterization

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Area of Science:

  • Rheology
  • Material Science
  • Environmental Engineering

Background:

  • Understanding the rheological properties of digested sludge is crucial for effective wastewater treatment and management.
  • Traditional methods for assessing sludge viscoelasticity can be complex and time-consuming.

Purpose of the Study:

  • To develop and validate a new impact method for investigating the rheological characteristics and transient dynamics of digested sludge.
  • To correlate impact parameters with sludge viscoelastic properties.

Main Methods:

  • An impact method utilizing a high-speed camera to visualize the sphere-sludge interaction during impact.
  • Development of a simplified impact drag force model to evaluate viscosity and elasticity.
  • Analysis of crater dimensions (diameter and depth) as a function of impactor properties and fall height.

Main Results:

  • Observed damping oscillations post-impact, indicating viscoelastic behavior.
  • Crater diameter followed an exponential function, while depth followed a logarithmic function of impactor size and fall height.
  • Impact-derived elastic modulus correlated well with Young's modulus, and impact viscosity was consistent with sludge yield stress.

Conclusions:

  • The impact method provides a viable alternative for characterizing digested sludge viscoelasticity.
  • This dynamic approach offers valuable insights into sludge behavior under impact loading.
  • The findings contribute to improved models for sludge handling and processing.