A mass transfer model for VOC emission from silage

Sasha D. Hafner, Felipe Montes, Clarence Alan Rotz

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Silage has been shown to be an important source of emissions of volatile organic compounds (VOCs), which contribute to the formation of ground-level ozone. Measurements have shown that environmental conditions and silage properties strongly influence emission rates, making it difficult to assess the contribution of silage in VOC emission inventories. In this work, we present an analytical convection-diffusion-dispersion model for predicting emission of VOCs from silage. It was necessary to incorporate empirical relationships from wind tunnel trials for the response of mass transfer parameters to surface air velocity and silage porosity. The resulting model was able to accurately predict the effect of temperature on ethanol emission in wind tunnel trials, but it over-predicted alcohol and aldehyde emission measured using a mass balance approach from corn silage samples outdoors and within barns. Mass balance results confirmed that emission is related to gas-phase porosity, but the response to air speed was not clear, which was contrary to wind tunnel results. Mass balance results indicate that alcohol emission from loose silage on farms may approach 50% of the initial mass over six hours, while relative losses of acetaldehyde will be greater.

Original languageEnglish (US)
Pages (from-to)134-140
Number of pages7
JournalAtmospheric Environment
Volume54
DOIs
StatePublished - Jul 1 2012

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silage
volatile organic compound
mass transfer
wind tunnel
mass balance
alcohol
porosity
acetaldehyde
air
emission inventory
aldehyde
ethanol
convection
maize
ozone
environmental conditions
farm
gas

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Atmospheric Science

Cite this

Hafner, Sasha D. ; Montes, Felipe ; Rotz, Clarence Alan. / A mass transfer model for VOC emission from silage. In: Atmospheric Environment. 2012 ; Vol. 54. pp. 134-140.
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A mass transfer model for VOC emission from silage. / Hafner, Sasha D.; Montes, Felipe; Rotz, Clarence Alan.

In: Atmospheric Environment, Vol. 54, 01.07.2012, p. 134-140.

Research output: Contribution to journalArticle

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AU - Montes, Felipe

AU - Rotz, Clarence Alan

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AB - Silage has been shown to be an important source of emissions of volatile organic compounds (VOCs), which contribute to the formation of ground-level ozone. Measurements have shown that environmental conditions and silage properties strongly influence emission rates, making it difficult to assess the contribution of silage in VOC emission inventories. In this work, we present an analytical convection-diffusion-dispersion model for predicting emission of VOCs from silage. It was necessary to incorporate empirical relationships from wind tunnel trials for the response of mass transfer parameters to surface air velocity and silage porosity. The resulting model was able to accurately predict the effect of temperature on ethanol emission in wind tunnel trials, but it over-predicted alcohol and aldehyde emission measured using a mass balance approach from corn silage samples outdoors and within barns. Mass balance results confirmed that emission is related to gas-phase porosity, but the response to air speed was not clear, which was contrary to wind tunnel results. Mass balance results indicate that alcohol emission from loose silage on farms may approach 50% of the initial mass over six hours, while relative losses of acetaldehyde will be greater.

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