Characterization of heavy metals and PCDD/Fs from water-washing pretreatment and a cement kiln co-processing municipal solid waste incinerator fly ash. (June 2018)

• Record Type: Journal Article
• Authors: Yan, Dahai; Peng, Zheng; Yu, Lifeng; Sun, Yangzhao; Yong, Ren; Helge Karstensen, Kåre
• Is Part Of: Waste management. Volume 76(2018)
• Page Start: 106
• Page End: 116
• Publication Date: 2018-06
• Subjects: Heavy metals -- Dioxins -- Water washing -- Cement kiln co-processing -- Fly ash; Hazardous wastes -- Periodicals; Refuse and refuse disposal -- Periodicals; 363.728
• DOI: 10.1016/j.wasman.2018.03.006
• Languages: English
• ISSNs: 0956-053X

Abstract

Graphical abstract: Highlights: Municipal solid-waste incinerator fly ash washed and co-processed in cement kiln. Heavy metal and polychlorinated dibenzo- p -dioxin/-furan deportments were studied. No impact on heavy metal concentrations of clinker except for Cd, Pb, and Sb. No impact on polychlorinated dibenzo- p -dioxins/-furan emissions from cement kiln. Destruction of 82.7% of input polychlorinated dibenzo- p -dioxins/furan in fly ash. Abstract: A disposal method for fly ash from a municipal solid waste incinerator (MSWI-FA) that involved a water washing pretreatment and co-processing in a cement kiln was tested. The mass flows of toxic heavy metals (HMs), including volatile HM (Hg), semi-volatile HMs (Pb, Cd, Tl, and As), and low-volatility HMs, and polychlorinated dibenzo-p-dioxin/polychlorinated dibenzofuran (PCDD/Fs) in the input, intermediate, and output materials were characterized. The flue gas Hg concentrations from tests 0, 1, and 2, fed with 0, 3.1, and 1.7 t/h of dried-washed FA (DWFA), were 28.60, 61.95, and 35.40 μg N m −3, respectively. Co-processing of DWFA did not significantly affect the metal concentration in clinker as most of the major input metals, with the exception of Cd, Pb, and Sb (which came from DWFA), were from raw materials and coal. Co-processing of DWFA did not influence on the release of PCDD/Fs; baseline and co-processing values ranged from 0.022 to 0.039 ng-TEQ/N m 3, and from 0.01 to 0.031 ng-TEQ/N m 3, respectively. The total destruction efficiency for PCDD/Fs in MSWI fly was 82.6%. This technology seems to be an environmentally sound option for the disposal of MSWI-FA.