Engineering analysis of fugitive particulate matter emissions from cattle feedyards

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Title: Engineering analysis of fugitive particulate matter emissions from cattle feedyards
Author: Hamm, Lee Bradford
Abstract: An engineering analysis of the fugitive particulate matter emissions from a feedyard is not simple . The presence of an evening dust peak in concentration measurements downwind of a feedyard complicates the calculation of an average 24 -h emission flux for the feedyard . The evening dust peak is a recurring event that occurs during evening hours when particulate matter concentration measurements increase and decrease dramatically during a short period of time . The concentrations measured during the evening can be up to 8 times the concentrations measured throughout the rest of the day . There is a perception that these concentration increases are due to increases in cattle activity as the temperature decreases during the evening . The purpose of Objective 1 of this research was to quantify the changes in concentrations based on changes in meteorological conditions and /or cattle activity . Using ISCST3 , a Gaussian -based EPAapproved dispersion model used to predict concentrations downwind of the feedyard , the results of this work indicate that up to 80 % of the increase in concentrations can be attributed to changes in meteorological conditions (wind speed , stability class , and mixing height . )The total fugitive particulate matter emissions on a cattle feedyard are due to two sources : unpaved roads (vehicle traffic ) and pen surfaces (cattle activity ) . Objective 2 of this research was to quantify the mass fraction of the concentration measurements that was due to unpaved road emissions (vehicle traffic ) . A recent finding by Wanjura et al . (2004 ) reported that as much as 80 % of the concentrations measured after a rain event were due to unpaved road emissions . An engineering analysis of the potential of the unpaved road emissions versus the total feedyard emissions using ISCST3 suggests that it is possible for 70 to 80 % of the concentration measurements to be attributed to unpaved road emissions . The purpose of Objective 3 was to demonstrate the science used by ISCST3 to predict concentrations downwind of an area source . Results from this study indicate that the ISCST3 model utilizes a form of the Gaussian line source algorithm to predict concentrations downwind of an area source .
URI: http : / /hdl .handle .net /1969 .1 /3240
Date: 2006-04-12

Citation

Engineering analysis of fugitive particulate matter emissions from cattle feedyards. Available electronically from http : / /hdl .handle .net /1969 .1 /3240 .

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