The wet scrubbers discussed can remove pollutants by dissolving them in the scrubber solution. SO2 and NO2 in power plant off-gases are often controlled in this way. Packed scrubbers, spray towers packed with glass platelets or glass frit, carry out such solution processes more efficiently than ordinary wet scrubbers; removal of fluoride from aluminum smelter exhaust gases is an example of packed scrubber use. Adsorption, or chemisorption, is the removal of organic compounds with an adsorbentlike activated charcoal (see Fig. 20-13).
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