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Reburning Treatment of the Froths Obtained after the Flotation of Incinerator Fly Ash

Category: Control Techniques and Strategy

Volume: 17 | Issue: 4 | Pages: 1084-1096
DOI: 10.4209/aaqr.2016.12.0535
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Guo-Xia Wei1, Han-Qiao Liu 2,3, Fang Liu2, Rui Zhang2, Yu-Wen Zhu2, Si-Yu Gao2

  • 1 School of Science, Tianjin Chengjian University, Tianjin 300384, China
  • 2 School of Energy and Safety Engineering, Tianjin Chengjian University, Tianjin 300384, China
  • 3 Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment, Tianjin 300384, China

Highlights

Reburning behavior of froths was compared with that of the fly ash.
Destruction efficiency of dioxins in the froths is relatively high.
Heavy metal volatilization ratios in the froths were relatively low.


Abstract

Flotation has been proven to successfully remove most polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) and carbon constituents from hospital solid waste incinerator (HSWI) fly ash. The resultant froths contain large quantities of carbon constituents that can reburn in the incinerator. In this paper, the reburning behavior of froths at temperatures from 800°C to 1200°C was compared with that of HSWI fly ash. Results showed that the destruction efficiency of PCDD/Fs was higher in the froths than in the fly ash at the same reburning temperature. The destruction efficiencies of PCDD/Fs in the froths exceeded 98% at temperatures higher than 1000°C. The volatilization ratio of Pb, Zn, and Cu was lower in the froths than in the fly ash. Furthermore, reburning of the froths can achieve energy recovery of the carbon constituents. Therefore, flotation followed by reburning treatment in a combustion chamber could be a suitable process for the detoxification and reutilization of HSWI fly ash.

Keywords

HSWI fly ash Reburning Flotation Heavy metals PCDD/Fs


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