Comparison of long-term stability under natural ageing between cement solidified and chelator-stabilised MSWI fly ash

Du, Bing; Li, Jiantao; Fang, Wen; Liu, Jianguo

doi:10.1016/j.envpol.2019.03.124

Cited by 68 publications

(21 citation statements)

References 43 publications

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“…Due to the low concentrations, there could be some fluctuations and errors in the data. Cd encapsulation in this study is in agreement with the literature [1,6,7,11,22,32,34,35,41,48]. The incorporation of bivalent ions, such as Cd 2+ , is possible in the structure of calcium sulfoaluminates such as Friedel's salt and ettringite, for example by ionic substitution of calcium [22].…”

Section: The Encapsulation Of Sbsupporting

confidence: 91%

“…All groups encapsulate Pb very well, with encapsulation percentages above 99%. Pb encapsulation performance is in agreement with the literature [1,6,[8][9][10][11]22,32,[36][37][38][39][40][41][42][43]. Pb is known to be an amphoteric element, so Pb concentration is high under highly alkaline conditions (such as in C70B0), but low in more neutral conditions.…”

Section: The Encapsulation Of Pbsupporting

confidence: 90%

“…2020, 10, x 14 of 22 not fixed within the C-S-H, but it can be adsorbed on the C-S-H surface. It is difficult to achieve efficient Pb immobilization using only cement [1,9,10,22,32,36]. Pb is mostly stabilized through physical encapsulation of its precipitates by the hardened hydrate matrix [10].…”

Section: The Encapsulation Of Pbmentioning

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%

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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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Section: The Encapsulation Of Sbsupporting

confidence: 91%

Section: The Encapsulation Of Pbsupporting

confidence: 90%

Section: The Encapsulation Of Pbmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…The most direct and simplest method is to add these wastes to cement to produce cement composites, which can greatly reduce the cost of cement and use a large amount of solid wastes. PC is the most used cementitious material [ 10 , 11 , 12 ]. Unfortunately, without special treatment, the hydration activity of these wastes is very low.…”

Section: Introductionmentioning

confidence: 99%

Influence of Superhydrophobic Coating on the Water Resistance of Foundry Dust/Magnesium Oxychloride Cement Composite

et al. 2020

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In this work, magnesium oxychloride cement (MOC) was used to realize the resource use of foundry dust (FD). Portland cement (PC)-based superhydrophobic coating was prepared on the surface of FD/MOC composite to improve the water resistance of the composite. First, the FD/MOC composites with different contents of FD were prepared. The phase structure of the composite was analyzed using X-ray diffraction (XRD). The microstructure of the cross-section and surface of the composite was observed using field emission scanning electron microscope (FE-SEM). The mechanical properties of the FD/MOC composites with different FD contents at different ages were tested and analyzed. Secondly, the superhydrophobic coating was prepared on the surface of MOC composite using silane/siloxane aqueous emulsion as the hydrophobic modifier, PC as the matrix and water as the solvent. The microstructure and chemical composition of the PC-based superhydrophobic coating were tested and analyzed. The results show that FD can significantly improve the early strength of the FD/MOC composite. The 28-day compressive strength of the FD/MOC composite decreases with increasing FD content. When the FD content is 30%, the 28-day compressive strength of the FD/MOC composite is as high as 75.68 MPa. Superhydrophobic coating can effectively improve the water resistance of the FD/MOC composite. The softening coefficient of the FD/MOC composite without superhydrophobic coating is less than 0.26, while that of the composite modified by superhydrophobic coating is greater than 0.81.

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Leaching behavior and mineral speciation of cement-solidified boiler fly ash from industrial waste incineration containing waste tires

Santiago

Sekito

Dote

2022

J Mater Cycles Waste Manag

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Comparison of long-term stability under natural ageing between cement solidified and chelator-stabilised MSWI fly ash

Cited by 68 publications

References 43 publications

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

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

Influence of Superhydrophobic Coating on the Water Resistance of Foundry Dust/Magnesium Oxychloride Cement Composite

Leaching behavior and mineral speciation of cement-solidified boiler fly ash from industrial waste incineration containing waste tires

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