An environmental nuisance: odor concentrated and transported by dust

Area of Science:

• Environmental Science
• Agricultural Engineering
• Atmospheric Chemistry

Background:

• Intensive swine production facilities release significant odorous emissions.
• These odors are complex mixtures including fatty acids, amines, aromatics, and sulfur compounds.
• Dust particles from feces and feed adsorb and concentrate these odorants, exacerbating the problem.

Purpose of the Study:

• To investigate the role of dust particles in swine odor emissions.
• To highlight the need for improved methods to quantify odor in the presence of airborne particulates.
• To inform strategies for predicting odor transport and reducing odor-related complaints.

Main Methods:

• Analysis of odorant compounds present in swine facility air.
• Investigation of dust particle composition and odorant adsorption capacity.
• Review of current odor measurement techniques and their limitations.

Main Results:

• Odorants are found in higher concentrations on dust particles compared to air.
• Dust inhalation and deposition in the olfactory mucosa are potential sources of odor complaints.
• Current odor assessment methods often remove particulate matter, hindering accurate real-world assessment.

Conclusions:

• Dust plays a critical role in the transport and perception of swine odors.
• Accurate odor modeling requires incorporating dust dispersion dynamics.
• Methodological innovations are needed to quantify odor in complex air streams containing both vapor and particulate phases.