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264 Lawrence K. Wang et al.

Fig. 12. Sulfur dioxide scrubbing using Q-PAC and 3.5 in. Tri-Packs. (Courtesy of Lantec
Products Inc.)

way, a simple repack of a tower may avoid a costly rebuild project. An optimized
packing material should also be considered for wet scrubbers in which media fouling
is a problem. The uniform spacing of the all rounded plastic elements, in addition to
the void space of >97% for a packing, such as Q-PAC, minimizes the tendency of
solids to accumulate on the packing surface. Hard water or high particulate loadings
will eventually foul any packing, but with the optimized packing material, a scrub-
ber prone to plugging can be operated longer before shutdown is required to clean
the packing.