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Related Experiment Videos

Compost convective airflow under passive aeration.

Suzelle Barrington1, Denis Choinière, Maher Trigui

  • 1Department of Agricultural and Biosystems Engineering, Macdonald Campus of McGill University, 21 111 Lakeshore, Ste Anne de Bellevue, Québec, Canada H9X 3V9. barrington@macdonald.mcgill.ca

Bioresource Technology
|April 12, 2003
PubMed
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Passive aeration in composting saves energy and is efficient. This study establishes a relationship between the Grashof number and airflow rates to optimize aeration duct design for passive composting systems.

Area of Science:

  • Environmental Science
  • Waste Management
  • Biotechnology

Background:

  • Passive aeration offers energy savings in composting compared to active aeration.
  • Proper design of aeration ducts is crucial for effective passive aeration.
  • Predicting convective airflow rates driven by temperature differentials is key.

Purpose of the Study:

  • To investigate temperature and convective airflow regimes in compost under passive aeration.
  • To establish a relationship between the Grashof number and convective airflow rates.
  • To provide guidance for sizing aeration ducts for passive composting systems.

Main Methods:

  • Composting experiments were conducted using wood shavings, hay, and straw at 60-70% moisture content.
  • Treatments were aerated under both passive and active regimes in 105 L laboratory vessels.

Related Experiment Videos

  • Temperature and convective airflow rates were measured and analyzed in relation to the Grashof number.

    • Main Results:

    • Passive aeration treatments consistently reached temperatures above 57°C.
    • Moisture content primarily affected peak compost temperatures in the early stages (days 2-6).
    • A predictive relationship was established between the Grashof number and convective airflow rates.

    Conclusions:

    • Passive aeration is a viable and energy-efficient method for composting.
    • Wood shavings and hay are more effective bulking agents than straw for passive aeration.
    • The established Grashof number relationship aids in designing efficient aeration ducts for passive composting.