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Related Experiment Videos

Air-filled porosity and permeability relationships during solid-state fermentation.

Tom L Richard1, Adrie H M Veeken, Vinnie de Wilde

  • 1Department of Agricultural and Biosystems Engineering, Iowa State University, Ames, Iowa 50011, USA. tlr@iastate.edu

Biotechnology Progress
|October 2, 2004
PubMed
Summary

Researchers measured key structural parameters of organic porous media, like porosity and permeability, in composted straw-manure. These findings are crucial for optimizing aerobic bioconversion systems.

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Area of Science:

  • Agricultural Engineering
  • Environmental Science
  • Materials Science

Background:

  • Organic porous media are vital for aerobic bioconversion systems.
  • Understanding structural parameters is critical for system engineering.
  • Composting significantly alters the physical properties of organic matrices.

Purpose of the Study:

  • To construct an apparatus for measuring structural parameters of organic porous media.
  • To quantify changes in mechanical strength, porosity, and permeability during composting.
  • To establish a framework for quantitative engineering design of bioconversion systems.

Main Methods:

  • Developed an experimental setup to measure mechanical strength, air-filled porosity, air permeability, and Ergun particle size.

Related Experiment Videos

  • Tested a straw-manure mixture before and after 13 days of in-vessel composting.
  • Measured porosity using air pycnometry and pressure drop at various airflow rates and moisture levels.

    • Main Results:

    • Air-filled porosity was accurately predicted from bulk density, moisture, and organic matter content.
    • Increased moisture led to reduced porosity but increased permeability, attributed to fines aggregation.
    • Effective particle size increased with moisture, and permeability ranged from 10(-10) to 10(-7) m2.
    • Mechanical strength data can predict compaction effects on porosity and permeability.

    Conclusions:

    • The study provides a quantitative framework for engineering organic porous media in solid-state fermentations.
    • Findings are applicable to optimizing aerobic bioconversion systems.
    • Understanding the interplay between moisture, density, and structural parameters is key for effective design.