Cumulative % greater than d, 99.99 99.8 99 98 95 90 80 70 60 50 40 30 20 10 2 1 0.5 0.2 0.01 40 30 30 20 20 10 10 dp um 5 2 1.0 0.01 1 2 1.0 99.99 10 20 30 40 50 60 70 80 Cumulative % less than d, 0.2 5 90 95 98 99 99.8 Figure 3.5 Plot of data for Example 3.2 showing a log-normal distribution. 3.4 Consider a cyclone that has the following theoretical efficiency versus particle size relationship: Size Range, um 0-2 2-4 4-7 7-10 10-15 15-25 25-40 40-60 >60 Efficiency, % 10 25 45 70 85 95 97 98 100

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What diameter would a circular clarifier have to be to remove 50 μm particles with 75% efficiency from a 4 MGD (million gallon per day) flow?  Assume the particle specific gravity is 1.5 and the temperature is 10°C.  Answer: 18 m

Calculate the aerosol scavenging coefficient ^ as a function of the diameter d of the scavenged particle over a size range of P 0.01 -0.1μm diameter for drops of diameter D = 5mm P falling at their terminal velocity in the air at 25°C. Assume that P = 1mmh¹ 0