Separate isokinetic EPA Method 13A and heated impactor tests of one cell of each of three (3) cooling towers in an industrial facility were performed during November 1989. The purpose of the EPA 13A test was to measure the total rate of mineral mass emissions. The heated cascade impactor isokinetic tests were performed to characterize the size of the mineral particulate emissions less than 10 micron in diameter (PM) after the water had evaporated from the drift droplets. Passing the wet sample through stream through a heated quartz tube to dry the drift droplets followed by separating the particles by size using an Anderson Mark III stack sampler performed the particle size characterization. The tests were performed within days of each other under similar operating and environmental conditions. The tests were performed within days of each other under similar operating and environmental conditions. The tests were redundant in terms of measuring the total mineral emission sand resulted in similar measurements of the total mineral emission sand resulted in similar measurements of the total mineral mass emission rate. The emissions rate measured by the EPA Method 13A averaged 102.6% of the rate measured by the heated cascade impactor isokinetic tests.

91-12: Comparison of Cooling Tower Mineral Mass Emmissions by Isokinetic EPA

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