Abstract

Methods for measuring emission rates of particulate matter (PM) from mechanically ventilated livestock buildingswere evaluated in the laboratory using a test chamber. Particulate matter concentrations were measured inside the chamberand at the exhaust duct. Concentrations at the exhaust duct were determined using high-volume traverse downstream of theexhaust fan, low-volume traverse downstream of the fan, and fixed sampling upstream and downstream of the fan. The high-volumetraverse was the reference method. Both traverse methods were conducted under isokinetic conditions; fixed sampling wasdone under both isokinetic and sub-isokinetic conditions. Both room sampling and exhaust sampling under sub-isokinetic conditionsseverely overestimated exhaust PM concentrations. The low-volume traverse and fixed sampling under isokinetic conditionsagreed well with the high-volume traverse (mean difference ranging from 7% to 14%). Methods involving room sampling,fixed sampling at exhaust, and high-volume traverse at exhaust were also compared in a swine finishing barn. Room samplingoverestimated concentrations at the exhaust by an average of 30%, and PM concentration from fixed sampling did not differsignificantly (p > 0.05) from that of the high-volume traverse method. It appears that fixed sampling under isokinetic conditionscan be used as an alternative to the high-volume PM traverse method to accurately measure PM concentrations at the exhaust,from which the PM emission rate can be determined.

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