A comparison of air pollution control systems for municipal solid waste incinerators.

The Flakt dry adsorption system (DAS) with reactors and quasi dry or wet-dry lime slurry absorption systems with spray dryers (DRYPAC) achieve the high removal efficiencies required by the ever more restrictive environmental regulations in the 80s and 90s. Results of acid gas removals range up to 98 percent for HCl and 95 percent for SO/sub 2/ as measured at commercial plants and over an extensive testing program at a pilot plant at the municipal incinerator in Quebec City, Canada. Organic removals for the toxic chlorinated dioxins and furans approach 99.9 percent plus under most fabric filter temperatures at the Quebec City pilot facility, while similar removal values are obtained at full size installations in Europe. The latter tests were carried out at seven MSW plants located at Busto Arsizio (Milan), Lugo (Ravenna) in Italy; Kempten and Geiselbullach (near Munich) in Germany; and Sysav, Hogdalen, Linkoping in southern Sweden. This paper presents a description of the two systems. A comparison between DAS and DRYPAC technology is presented with operating and test results for the two alternative systems. In evaluating the two systems, the completely dry injection system (DAS) has a capital and operating cost advantage for incinerators of 250-300 TM/daymore » of MSW. No difference was determined, however, in acid gas removal efficiencies for the two alternatives.« less