The behaviour of heavy metals and phosphorus in an ash melting process

Takaoka, Masaki; Takeda, Nobuo; Miura, Satoshi

doi:10.2166/wst.1997.0421

Cited by 32 publications

(22 citation statements)

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“…There have been many reports on content of heavy metals in slag and fly ash, but only a few studies have been done on the distribution in a facility (Yoshiie, et al, 2001 ;Takaoka, et al, 1997). These works have been limited to specific metals or facilities.…”

Section: Introductionmentioning

confidence: 99%

Behavior of metals in ash melting and gasification-melting of municipal solid waste (MSW)

2005

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In this study, metal behavior in ash-melting and MSW gasification-melting facilities were investigated. Eight ash-melting and three MSW gasification-melting facilities with a variety of melting processes and feedstocks were selected. From each facility, melting furnace fly ash (MFA) and molten slag were sampled, and feedstock of the ash-melting processes was also taken. For the ash melting process, the generation rate of MFA was well correlated with the ratio of incineration fly ash (IFA) in feedstock, and this was because MFA was formed mostly by mass transfer from IFA and a limited amount from bottom ash (BA). Distribution ratios of metal elements to MFA were generally determined by volatility of the metal element, but chlorine content in feedstock had a significant effect on Cu and a marginal effect on Pb.Distribution ratio of Zn to MFA was influenced by the oxidizing atmosphere in the furnace.High MFA generation and distribution ratio of non-volatile metals to MFA in gasification-melting facilities was probably caused by carry-over of fine particles to the air pollution control system due to large gas volume. Finally, dilution effect was shown to have a significant effect on metal concentration in MFA.

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Section: Introductionmentioning

confidence: 99%

Behavior of metals in ash melting and gasification-melting of municipal solid waste (MSW)

2005

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“…As for S1 and S3, the amounts of several heavy metals were even higher than those in raw ashes, such as Pb, Zn and Cu. The reason was that the high content of Chlorine in FA1 and FA3 impeded the stabilization of heavy metals [25][26][27] and the high value of basicity of FA1 and FA3 led to poor efficiency of vitrification [28]. It should be noted here, the total elemental mass balances were not considered in this study for some volatile metals such as Cd and Pb may evaporate to the atmosphere during molten stage.…”

Section: Metal Leaching Testmentioning

confidence: 95%

Characteristics of Melting Incinerator Ashes Using a Direct Current Plasma Torch

Pan¹

2014

J Environ Anal Toxicol

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“…It was reported that in flue gas, 72% of Zn, 24% of Cr, 46% of Cd, 30% of Ni, 36% of Cu, and 86% of Pb were in fly ash [16][17], and over 90% of dioxins condensed in fly ash too [18][19]. It indicated that reducing the emission of dioxins and heavy metals should be concentrated on the treatment of fly ash.…”

Section: Characteristics Of Fly Ash Meltingmentioning

confidence: 99%

Research on low emission MSW gasification and melting system

Xiao

Chi

et al. 2007

Front. Environ. Sci. Eng. China

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In order to eliminate secondary pollution caused by municipal solid waste (MSW) incineration, a MSW gasification and melting process is proposed. The process is expected to reduce the emission of pollutants, especially heavy-metals and dioxins. In this paper, the combustible components of MSW and simulated MSW were gasified in a lab-scale fluidized bed at 400°C-700°C when the excess air ratio (ER) was between 0.2 and 0.8. The experimental results indicated that the MSW could be gasified effectively in a fluidized bed at approximately 600°C-700°C when excess air ratio was 0.2-0.4. The melting characteristics of two typical fly ash samples from MSW incinerators were investigated. The results indicated that fly ash of pure MSW incineration could be melted at approximately 1,300°C and that of MSW and coal co-combustion could be melted at approximately 1,400°C. When temperature was over 1,100°C, more than 99.9% of the dioxins could be decomposed and most of the heavy-metals could be solidified in the slag. Based on the above experiments, two feasible MSW gasification and melting processes were proposed for low calorific value MSW:(1) sieved MSW gasification and melting system, which was based on an idea of multi-recycle; (2) gasification and melting scheme of MSW adding coal as assistant fuel.

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The behaviour of heavy metals and phosphorus in an ash melting process

Cited by 32 publications

References 0 publications

Behavior of metals in ash melting and gasification-melting of municipal solid waste (MSW)

Behavior of metals in ash melting and gasification-melting of municipal solid waste (MSW)

Characteristics of Melting Incinerator Ashes Using a Direct Current Plasma Torch

Research on low emission MSW gasification and melting system

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