Model to predict human and pig exposure to gaseous contaminants emitted from stored manure
Resource
Applied Mathematical Modelling 20 (10): 731-740
Journal
Applied Mathematical Modelling
Journal Volume
20
Journal Issue
10
Pages
731-740
Date Issued
1996
Date
1996
Author(s)
Abstract
This paper describes a model for quantifying human and pig exposure to gaseous contaminants as a result of mass transfer from stored manure to ventilation air in a confinement unit. A lumped-parameter model is used to simulate 24-hr average concentration profiles within the pig unit. Mass transfers from manure pit to air are derived from the two-film resistance theory. A preliminary data base for a typical pig unit is used to calculate a range of air concentrations and pig exposures for three growth stages: growing, nursery, and prenursery. The model is used to estimate exposure dose factors for four gaseous contaminants: methane, ammonia, hydrogen sulfide, and carbon dioxide. The calculated ratio of ventilation air exposure to concentrations in stored pig manure is compared to measured values from literature researches to adjust the transfer coefficients in order to estimate pig exposure in terms of a lifetime inhalation dose factor. A sensitivity analysis for identifying the important parameters in the simulation model is also presented. © 1996 by Elsevier Science Inc.
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Type
journal article
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