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Related Experiment Videos

A pilot-scale study on biofilters for controlling animal rendering process odours.

J Luo1

  • 1Land and Environmental Management Group, AgResearch, Ruakura Research Centre, Private Bag 3123, Hamilton, New Zealand.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|January 5, 2002
PubMed
Summary

Biofiltration effectively removes rendering odors using bark or soil media, achieving high efficiencies. Coarse bark media minimizes pressure drop, enhancing biofilter longevity and performance over three years.

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Area of Science:

  • Environmental Engineering
  • Air Pollution Control
  • Waste Management

Background:

  • Rendering processes release odorous compounds from animal tissues.
  • Biofiltration is a potential technology for mitigating these industrial odors.
  • Different filter media can impact biofilter efficiency and operational characteristics.

Purpose of the Study:

  • To evaluate the odor removal performance of pilot-scale biofilters using various media.
  • To assess the influence of media type and air loading rates on efficiency.
  • To investigate factors affecting biofilter longevity, including pressure drop and leachate composition.

Main Methods:

  • Utilized pilot-scale biofilters with sand, fine bark, coarse bark, and bark/soil mixture.
  • Measured odor removal efficiencies using olfactometry.

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  • Monitored influent odor concentrations, air loading rates, pressure drop, and leachate composition over three years.

    • Main Results:

    • Achieved odor removal efficiencies ranging from 29.7% to 99.9% across different conditions.
    • Biofilters with bark or bark/soil media at low air loading rates demonstrated superior performance.
    • Coarse bark media exhibited negligible pressure drop, while sand and fine bark caused high pressure drops, exacerbated by moisture.

    Conclusions:

    • Bark and bark/soil biofilters are effective for rendering odor control, especially at lower air loading rates.
    • Controlled leaching of biofilter media can potentially extend system lifespan by removing accumulated compounds.
    • Minimizing pressure drop, particularly with coarse bark, is crucial for maintaining optimal biofilter performance and longevity.