101. Monochlorinated to Octachlorinated Polychlorinated Dibenzo-p-dioxin and Dibenzofuran Emissions in Sintering Fly Ash from Multiple-Field Electrostatic Precipitators
- Author
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Qianqian Li, Wenbin Liu, Ying Han, Mingliang Fang, Mengjing Wang, and School of Civil and Environmental Engineering
- Subjects
Air Pollutants ,Polychlorinated Dibenzodioxins ,Civil engineering [Engineering] ,010504 meteorology & atmospheric sciences ,Chemistry ,Sintering ,Fly Ash ,Incineration ,General Chemistry ,Dibenzofurans, Polychlorinated ,010501 environmental sciences ,Coal Ash ,01 natural sciences ,Dibenzofuran ,chemistry.chemical_compound ,Fly ash ,Environmental chemistry ,Environmental Chemistry ,Particle size ,Dibenzofurans ,Polychlorinated Dibenzo-p-dioxin And Dibenzofuran ,Dibenzo-p-dioxin ,Environmental Monitoring ,0105 earth and related environmental sciences - Abstract
Polychlorinated dibenzo-p-dioxin and dibenzofuran (PCDD/F) emissions in fly ash from multiple-field electrostatic precipitators in different sized sintering plants were studied. The monochlorinated-trichlorinated and tetrachlorinated-octachlorinated PCDD/F concentrations were higher for small plants (90 m2) than for medium (91-180 m2) and large (>180 m2) plants. The PCDD/F concentrations and less-chlorinated PCDD/F contributions to the total PCDD/F concentrations increased as the fly ash particle size decreased moving through the precipitator stages; the abundance of monochlorinated-trichlorinated PCDD/F congeners and homologues also increased. The ash particle size and surface area can be directly used to indicate monochlorinated-trichlorinated PCDD/Fs and toxic equivalents (TEQs). Previously ignored PCDD/F emissions in discarded fly ash were identified. Estimated total monochlorinated-trichlorinated PCDD/F and TEQ emissions in discarded fly ash were 155 and 1.979 kg TEQ, respectively, in 2003-2014, and the ratio between annual PCDD/F emissions in discarded fly ash and flue gases has gradually increased. Reductions in monochlorinated-trichlorinated PCDD/F emitted in flue gas and fly ash in 2003-2014 were 28 and 40 kg, respectively, because of the phasing out of small-scale plants. Reductions in TEQs emitted in flue gas and fly ash in 2003-2014 were 7476 and 180 g TEQ, respectively.
- Published
- 2018