title: PCDD/DF concentrations at the inlets and outlets of wet scrubbers in Korean waste incinerators.
abstract: To further understand the effects of wet scrubbers on PCDD/DF levels, it was measured the concentrations of PCDD/DF, dust, and other gaseous pollutants at both the inlets and the outlets of seven wet scrubbers. As a result, the concentrations of PCDD/DF at the inlets and outlets of the wet scrubbers ranged from 0.2 to 37.4, and 0.8 to 6.0 ng TEQ N m-3, respectively. With the exceptions of wet scrubbers F and G, the PCDD/DF levels decreased by and large in most wet scrubbers. It was thought that their relatively high removal efficiencies were more increased with heavier loads of dust and particle-bound PCDD/DF. On the other hand, it was also surveyed the increase of gaseous PCDD/DF in wet scrubber, where the total level of PCDD/DF was decreased. However, it was not sure whether it had been resulted from the thermal adsorption/desorption phenomenon between packing materials and emission gases or not. At the very least, however, although there still remains an unexplained aspect for the increase of gaseous PCDD/DF, it is clear that wet scrubbers can be sufficiently applied to remove PCDD/DF to a certain extent, if only removal efficiencies for the particle loads are high, and if a significant part of the PCDD/DF at the inlets is particle associated.
authors.affiliation: Research Center for Material Cycles and Waste Management, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
authors.forename: Ki-In
authors.initials: KI
authors.lastname: Choi
authors.forename: Dong-Hoon
authors.initials: DH
authors.lastname: Lee
mesh_terms: D000397:Air Pollution / Q000032:analysis; D001572:Benzofurans / Q000032:analysis*; D000072338:Dibenzofurans, Polychlorinated; D004391:Dust / Q000032:analysis / Q000517:prevention & control; D006851:Hydrochloric Acid / Q000032:analysis / Q000737:chemistry; D017745:Incineration; D007723:Korea; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis; D012037:Refuse Disposal / Q000295:instrumentation* / Q000379:methods; D013696:Temperature
chemical_list: D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D004391:Dust; D000072317:Polychlorinated Dibenzodioxins; D006851:Hydrochloric Acid