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An Inhalation Dose Model for Assessing Dust-Borne VOC-Odor Exposure from Feeding in Swine Buildings

Author:
Liao, C.M., Chen, J.W., Huang, M.Y., Chen, J.S., Chang, T.J.
Source:
Transactions of the ASAE 2001 v.44 no.6 pp. 1813-1824
ISSN:
0001-2351
Subject:
adsorption, aerosols, barns, breathing, farms, lognormal distribution, odors, particle size, particle size distribution, simulation models, swine, swine feeding, swine housing, volatile organic compounds, Taiwan
Abstract:
A dynamic, size-dependent integrated inhalation dose model for quantifying worker/animal exposure to dust-borne odor causing volatile organic compounds (VOC-odor) in swine buildings during and after feeding was developed. The exposure of dust-borne VOC-odor observed in pig barns can be characterized by adsorption and deposition of airborne dust. The airborne dust particle size, aerosol profile, enclosure dimension, ventilation rate, and feeding duration were affecting the integrated inhalation model in assessing dust-borne VOC-odor exposure during and after the time of feeding. Experimental results show that there is no significant variation in feeding and non-feeding periods for the particle size distributions in a growing pig farm located in southern region of Taiwan and both followed a lognormal distribution with geometric mean diameter of 2.14 ± 0.03 µ m (mean ± 1 sd) and geometric standard deviation of 1.73 ± 0.02. Mean total dust mass concentrations were 20.47 ± 8.23 and 2.32 ± 0.45 mg m -3 , respectively, for feeding and non-feeding periods. Model simulations show that the inhalation dose for a short feeding duration followed by a long stay in the pig barn can equal that of a long feeding duration followed by a short subsequent exposure. Reduction of both the feeding duration and/or subsequent time in the pig barn is highly effective in dose reduction.
Agid:
3154533