title: Removal and speciation of mercury compounds in flue gas from a waste incinerator.
abstract: The management and control of mercury emissions from waste incinerators have become more significant, because waste incinerators are sinks to treat mercury-containing consumer products. This study investigated the effects of mercury concentrations and waste incineration temperatures on mercury speciation using a lab-scale experimental instrument. The removal characteristics of different mercury species were also investigated using an apparatus to simulate the fabric filter with a thin layer of additives such as Ca(OH)2 and NaHCO3, activated carbon (AC), and fly ash. HgCl2 generation rates peaked at 800°C for initial Hg(0) concentrations of 0.08-3.61 mg/Nm(3) in the presence of 400 ppm HCl. A linear relationship was established between the generation rate of HgCl2 and the logarithmic value of initial mercury concentration. Fly ash proved highly efficient in mercury removal, being equal or superior to AC. On the other hand, Ca(OH)2 and NaHCO3 were shown to have no effects on mercury removal. In the dry-scrubbing process, alkali agent is often sprayed in amounts beyond those stoichiometrically required to aid acidic gas removal. The research suggests, however, that this may hinder mercury removal from the flue gas of solid waste incinerators.
authors.affiliation: a Laboratory of Solid Waste Disposal Engineering, Faculty of Engineering , Hokkaido University , Sapporo , Japan.
authors.forename: In-Hee
authors.initials: IH
authors.lastname: Hwang
authors.affiliation: a Laboratory of Solid Waste Disposal Engineering, Faculty of Engineering , Hokkaido University , Sapporo , Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Minoya
authors.affiliation: a Laboratory of Solid Waste Disposal Engineering, Faculty of Engineering , Hokkaido University , Sapporo , Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Matsuo
authors.affiliation: a Laboratory of Solid Waste Disposal Engineering, Faculty of Engineering , Hokkaido University , Sapporo , Japan.
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Matsuto
authors.affiliation: a Laboratory of Solid Waste Disposal Engineering, Faculty of Engineering , Hokkaido University , Sapporo , Japan.
authors.forename: Yasumasa
authors.initials: Y
authors.lastname: Tojo
mesh_terms: D000393:Air Pollutants / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*; D060729:Coal Ash / Q000737:chemistry*; D005374:Filtration; D017745:Incineration; D007220:Industrial Waste; D017669:Mercury Compounds / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D000393:Air Pollutants; D060729:Coal Ash; D007220:Industrial Waste; D017669:Mercury Compounds
keywords: Fabric filter; flue gas; fly ash; mercury; waste incinerator