title: Inhibition of PCDD/F by adding sulphur compounds to the feed of a hazardous waste incinerator.
abstract: Sulphur compounds, including (NH(4))(2)SO(4) and pyrite, were tested as suppressants in a hazardous waste incineration facility. The test results suggested that adding sulphur compounds only slightly reduced PCDD/F stack emissions; this restricted effect was attributed to the release of fly ash in large amounts during the sulphur adding experiments, i.e., it was due to a malfunctioning of the baghouse filter. Nevertheless, for the combined flow of flue gas+fly ash a reduction of more than 50% was achieved for the total PCDD/F concentrations and the total toxic concentrations, and an even higher inhibition capability was observed for PCDD. Also, a simulation of the thermodynamic equilibrium conditions by sulphur dioxide was conducted in the domain of experimental interest. Deactivation of catalysts, which promote PCDD/F formation, was found to be the dominant inhibition mechanism in low temperature PCDD/F formation. SO(2) could also inhibit the formation of molecular Cl(2) via the Deacon reaction, but that was not the main reason for inhibition.
authors: State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, Zhejiang Province 310027, China.
authors: Hai-Long
authors: HL
authors: Wu
authors: Sheng-Yong
authors: SY
authors: Lu
authors: Xiao-Dong
authors: XD
authors: Li
authors: Xu-Guang
authors: XG
authors: Jiang
authors: Jian-Hua
authors: JH
authors: Yan
authors: Miao-Sheng
authors: MS
authors: Zhou
authors: Hua
authors: H
authors: Wang
mesh_terms: D000393:Air Pollutants / Q000032:analysis / Q000737:chemistry; D001572:Benzofurans / Q000032:analysis / Q000737:chemistry*; D000072338:Dibenzofurans, Polychlorinated; D015386:Hazardous Substances / Q000032:analysis*; D017745:Incineration / Q000379:methods*; D007501:Iron / Q000737:chemistry; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry; D013440:Sulfides / Q000737:chemistry; D013455:Sulfur / Q000737:chemistry*
chemical_list: D000393:Air Pollutants; D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D015386:Hazardous Substances; D000072317:Polychlorinated Dibenzodioxins; D013440:Sulfides; C011342:pyrite; D013455:Sulfur; D007501:Iron