Review on Cement Stabilization/Solidification of Municipal Solid Waste Incineration Fly Ash

Fan, Chengcheng; Wang, Baomin; Zhang, Tingting

doi:10.1155/2018/5120649

Cited by 49 publications

(17 citation statements)

References 43 publications

(42 reference statements)

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“…Heavy metals in FA are derived from plastics, paper, batteries, electrical appliances, paints, pesticides, semiconductors, goldplated materials, textiles, and so on, and these HMs mostly exist as oxides, chlorides, hydroxides, and carbonates (Fan et al, 2018). Be aware of their sources and chemical forms may provide theoretical guidance for the HM recycling technologies.…”

Section: Hms In Mswi Famentioning

confidence: 99%

A mini-review of heavy metal recycling technologies for municipal solid waste incineration fly ash

et al. 2021

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This mini-review article summarizes the available technologies for the recycling of heavy metals (HMs) in municipal solid waste incineration (MSWI) fly ash (FA). Recovery technologies included thermal separation (TS), chemical extraction (CE), bioleaching, and electrochemical processes. The reaction conditions of various methods, the efficiency of recovering HMs from MSWI FA and the difficulties and solutions in the process of technical development were studied. Evaluation of each process has also been done to determine the best HM recycling method and future challenges. Results showed that while bioleaching had minimal environmental impact, the process was time-consuming. TS and CE were the most mature technologies, but the former process was not cost-effective. Overall, it has the greatest economic potential to recover metals by CE with scrubber liquid produced by a wet air pollution control system. An electrochemical process or solvent extraction could then be applied to recover HMs from the enriched leachate. Ongoing development of TS and bioleaching technologies could reduce the treatment cost or time.

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Section: Hms In Mswi Famentioning

confidence: 99%

A mini-review of heavy metal recycling technologies for municipal solid waste incineration fly ash

et al. 2021

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“…The aluminum site can accommodate different trivalent and tetravalent cations in varying proportions. Monovalent and divalent anions and cations may also be incorporated in these phases [2,8,10,14,17,22,34,35,41,45,49]. The uptake of divalent metal cations in these phases occurs through the precipitation of the metal hydroxides on the surfaces, intercalation by structural incorporation, and adsorption by the surface hydroxyl groups [17,49].…”

Section: Encapsulation and Hydrate Naturementioning

confidence: 99%

“…Municipal solid waste incineration fly ash (MSWIFA) is classified as hazardous waste in numerous locations across the globe [1][2][3][4][5]. MSWIFA has high concentrations of soluble heavy metals, including Pb, Zn, Cr, Sb, Hg, Cu, Ni, and Cd.…”

Section: Introductionmentioning

confidence: 99%

Optimal Mixture Designs for Heavy Metal Encapsulation in Municipal Solid Waste Incineration Fly Ash

et al. 2020

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Mixing municipal solid waste incineration fly ash (MSWIFA) with industrial by-products such as ground granulated blast furnace slag (GGBFS) and ladle furnace slag (LFS) can lead to a hardened system which can encapsulate the heavy metals present in the MSWIFA. The objective of this study is to find optimal mixture designs to effectively encapsulate these heavy metals. The nature of the hydrates and the strength of the mixtures are studied to develop a sustainable and practical construction material incorporating MSWIFA. Heavy metals including Cr, Cu, Zn and Cd are safely encapsulated in several developed mixtures with leachate concentration below EPA drinking water limit. The encapsulation behavior is complex and depends on metal type, age of testing, and hydration products. In general, mixtures containing LFS have more aluminate hydrates, and show greater encapsulation capacity for most heavy metals. However, they also generally show significant Sb leaching. Mixtures which show satisfactory encapsulation for all ions and adequate strength development are identified. Three ideal mixtures, including one containing zero cement, are identified which satisfy both leaching and strength requirements.

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“…The leaching concentrations of Zn, Pb and Cd in MWI fly ash and the tailing were much higher compared with the limit values, which mean that they cannot be filled in the landfill site of municipal solid waste. Immobilization mechanisms of heavy metal during cement hydration process are very complex, which change with matrix materials structure [25]. The migration of heavy metal ions is hindered or absorbed by the products of the cement hydration reactions.…”

Section: Effect Of Flotation On Leaching Concentration Of Heavy Metalsmentioning

confidence: 99%

Cement solidification of the tailings after flotation of medical waste incinerator fly ash

Wei¹,

Liu²,

Zeng³

et al. 2019

DWT

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Medical waste incinerator (MWI) fly ash contains a large amount of carbon constituents and dioxins, which could be removed by flotation. Simultaneously, chlorides could be washed out. In this paper, the cement solidification of the flotation products (tailings) was executed and compared with that of MWI fly ash. Results revealed that the water demand of cementitious mixtures with MWI fly ash was higher than that with the tailings, and the setting time of test block with MWI fly ash was longer than that with the tailings. The compressive strength and heavy metal stabilization effect of test block of the tailings was better than those of MWI fly ash. After 7d curing, the compressive strength of test block of the fly ash met the threshold of 0.35MPa for the landfill's requirement only when above 70% cement ratio is mixed, and those of all test block of the tailings meets the requirement. In order to make the leaching concentration of heavy metals in test block meet landfill standard, the ratio of fly ash and the tailings in test block should be controlled below 30% and above 60%, respectively.

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Review on Cement Stabilization/Solidification of Municipal Solid Waste Incineration Fly Ash

Cited by 49 publications

References 43 publications

A mini-review of heavy metal recycling technologies for municipal solid waste incineration fly ash

A mini-review of heavy metal recycling technologies for municipal solid waste incineration fly ash

Optimal Mixture Designs for Heavy Metal Encapsulation in Municipal Solid Waste Incineration Fly Ash

Cement solidification of the tailings after flotation of medical waste incinerator fly ash

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