Thermal treatment of the fly ash from municipal solid waste incinerator with rotary kiln

Wey, Ming‐Yen; Liu, Kuang-Yu; Tsai, Tzung‐Jiun; Chou, Jing-Tong

doi:10.1016/j.jhazmat.2006.03.024

Cited by 91 publications

(53 citation statements)

References 28 publications

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“…The performance of ecocement The sintering treatment in a rotary kiln can be fitted to incinerator plants and operated continuously. Waterwashing pre-treatment is an effective process for decreasing both the sintering temperature (700-900°C) and time, removing chlorides from FA Wey et al (2006) is similar to the rapid hardening cement, but contains larger quantities of chlorides. Unlike the bottom ash produced during municipal solid waste incineration, which may be used under some circumstances for agricultural purposes (Zhang et al, 2001(Zhang et al, , 2002, APC residues are not recommended for this application due to their high concentration of heavy metals.…”

Section: Possible Applicationsmentioning

confidence: 99%

Treatment and use of air pollution control residues from MSW incineration: An overview

Bordado²,

2008

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This work reviews strategies for the management of municipal solid waste incineration (MSWI) residues, particularly solid particles collected from flue gases. These tiny particles may be retained by different equipment, with or without additives (lime, activated carbon, etc.), and depending on the different possible combinations, their properties may vary. In industrial plants, the most commonly used equipment for heat recovery and the cleaning of gas emissions are: heat recovery devices (boiler, superheater and economiser); dry, semidry or wet scrubbers; electrostatic precipitators; bag filters; fabric filters, and cyclones. In accordance with the stringent regulations in force in developed countries, these residues are considered hazardous, and therefore must be treated before being disposed of in landfills. Nowadays, research is being conducted into specific applications for these residues in order to prevent landfill practices. There are basically two possible ways of handling these residues: landfill after adequate treatment or recycling as a secondary material. The different types of treatment may be grouped into three categories: separation processes, solidification/stabilization, and thermal methods. These residues generally have limited applications, mainly due to the fact that they tend to contain large quantities of soluble salts (NaCl, KCl, calcium compounds), significant amounts of toxic heavy metals (Pb, Zn, Cr, Cu, Ni, Cd) in forms that may easily leach out, and trace quantities of very toxic organic compounds (dioxin, furans). The most promising materials for recycling this residue are ceramics and glass-ceramic materials.The main purpose of the present paper is to review the published literature in this field. A range of studies have been summarized in a series of tables focusing upon management strategies used in various countries, waste composition, treatment processes and possible applications.

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Section: Possible Applicationsmentioning

confidence: 99%

Treatment and use of air pollution control residues from MSW incineration: An overview

Bordado²,

2008

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“…In fact, a continuous issue facing society is the disposal of municipal and industrial solid wastes. The limits in landfill sites, the growing amount of such wastes, the increasing disposal costs and the ever more stringent regulations have stimulated efforts to improve the efficiency and acceptability of the incineration technology through flue gas treatments and fly ash detoxification by water-washing followed by a sintering treatment [1]. Emission factors and removal efficiencies of heavy metals have been investigated [2] and the kinetics of heavy metal release during waste incineration were studied in the laboratory [3].…”

Section: Introductionmentioning

confidence: 99%

Heavy metal vaporization and abatement during thermal treatment of modified wastes

Rio

Verwilghen

Ramaroson

et al. 2007

Journal of Hazardous Materials

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This study examines the vaporization percentage and partitioning of heavy metals Cd, Pb and Zn during thermal treatment of wastes with added PVC, heavy metals or phosphate, and the efficiency of sorbents for removal of these metallic compounds in flue gas of an industrial solid waste incinerator. Firstly, vaporization experiments were carried out to determine the behavior of heavy metals during combustion under various conditions (type of waste, temperature, presence of chloride or phosphate ...). The experimental results show relatively high vaporization percentage of metallic compounds within fly ash and limestone matrix while heavy metals within sediments treated with phosphoric acid are less volatile. Vaporization of metals increases with increasing temperature and with chloride addition. The thermal behavior of the selected heavy metals and their removal by sorbents (sodium bicarbonate, activated carbon) was also studied in an industrial solid waste incinerator. These pilot scale experiments confirm that heavy metals are concentrated in fly ashes and cyclone residues, thus effectively controlling their release to the atmosphere.

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“…This is probably because Zn is simultaneously involved in two distinct competing reactions (Stucki et al, 1997;Nowak et al, 2013): (1) Zn oxides react with NaCl to form a volatile compound zinc chloride (ZnCl 2 ) as a reaction, and (2) Zn oxides react with SiO 2 and Al 2 O 3 to form some more stable compounds such as willemite (Zn 2 SiO 4 ) and zinc aluminate (ZnAl 2 O 4 ). Wey (2006) revealed that the water-washing process could change the speciation of Cu and Pb and inhibit their emission during thermal treatment. In the present study, the volatilization ratio of Cr in the fly ash and froths was close because of high boiling points (Kuo et al, 2012).…”

Section: Effect Of Flotation On the Phase Distribution And Volatilizamentioning

confidence: 99%

“…Heavy metals cannot be destroyed but can be partially or completely vaporized at high temperatures. Differences in the volatilization process of heavy metals can result from differences in their chemical composition (Wey et al, 2006). Previous studies have indicated that removing chlorine from the fly ash through the water-washing method can reduce the emission of metallic chlorides during subsequent melting treatment and can improve the efficacy of melting or sintering treatment (Wey et al, 2006;Chiang et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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

Wei

Liu²,

Liu

et al. 2017

Aerosol Air Qual. Res.

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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.

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Thermal treatment of the fly ash from municipal solid waste incinerator with rotary kiln

Cited by 91 publications

References 28 publications

Treatment and use of air pollution control residues from MSW incineration: An overview

Treatment and use of air pollution control residues from MSW incineration: An overview

Heavy metal vaporization and abatement during thermal treatment of modified wastes

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

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