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Wet and Dry Scrubbing 201
Fig. 1. Four common types of wet scrubbing systems. (From ref. 15.)
2.2.3. Packed Towers (Scrubbers)
A packed tower (scrubber), as seen in Fig. 1b, is commonly used to absorb pollutant(s)
present in a gas stream. As discussed previously, the classic scrubber tower takes advan-
tage of the countercurrent flow of gas and liquid; the gas passes up through the tower
as the liquid passes downward. The actual mass transfer from gas to liquid occurs in the
