Solidification of heavy metals and PCDD/Fs from municipal solid waste incineration fly ash by the polymerization of calcium carbonate oligomers

Lin, Xiaoqing; Chen, Jie; Xu, Shuaixi; Mao, Tieying; Liu, Weiping; Wu, Jiezhen; Li, Xiaodong; Yan, Jun

doi:10.1016/j.chemosphere.2021.132420

Cited by 19 publications

(3 citation statements)

References 40 publications

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“…Calcium carbonate oligomers are precursors in the gel state to effectively solidify/stabilize heavy metals in MSWI FA. Lin et al 127 indicated that the curing of heavy metals by MSWI FA could be improved by synergistic treatment with water washing and calcium carbonate oligomers, with curing efficiencies of 81.9%, 90.0%, 93.5%, 91.8%, 99.6%, and 95.5% for zinc, copper, cadmium, chromium, lead, and arsenic, respectively. Moreover, geopolymers can be effective in significantly reducing greenhouse gas emission rates.…”

Section: Mechanochemical Methodmentioning

confidence: 99%

Advances and Outlook of Heavy Metal Treatment Technology from Municipal Solid Waste Incineration Fly Ash: A Review

Xiao,

Huang,

Cheng

et al. 2023

Energy Fuels

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With the global industrialization process and socioeconomic development, the amount of municipal solid waste (MSW) generated is growing significantly. With the growth trend of municipal solid waste, incineration is widely used for waste treatment but produces a large amount of municipal solid waste incineration fly ash, which contains heavy metals that can seriously harm human health and the ecological environment. In this Review, the current situation of MSWI fly ash disposal is reviewed, and the technologies for harmless disposal and resource utilization of heavy metals in MSWI fly ash are summarized, including solidification stabilization, leaching extraction, heat treatment, combination methods, etc. We meticulously summarized the recent progress of various incineration fly ash disposal technologies, analyzed the difficulties and solutions in formulating various feasible technical strategies, and compared their potential in the safe, environmentally friendly, and economical utilization of MSW fly ash resources. Furthermore, we also provide an outlook on the potential challenges and prospects of future progress in the harmless disposal and resource recycling of fly ash.

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Section: Mechanochemical Methodmentioning

confidence: 99%

Advances and Outlook of Heavy Metal Treatment Technology from Municipal Solid Waste Incineration Fly Ash: A Review

Xiao,

Huang,

Cheng

et al. 2023

Energy Fuels

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“…It is speculated that the formation of a small amount of carbonate precipitation, which is consistent with the research result that the weak acid extraction state of As increased slightly in this study. The continuous CaCO 3 structure adsorbed and encapsulated fly ash, heavy metal was transformed from the free state to carbonate precipitation through carbonation, was easier to be physically solidified by CaCO 3 [59]. In addition, the precipitation of metals on the surface of silicate phase reflects the degree of solidification of metals, CaCO 3 can accelerate the formation of silicate, promote the solidification/stability of waste.…”

Section: Influence Of Stabilized Products On As and Sbmentioning

confidence: 99%

<i>In-situ</i> Stability and Remediation of Typical Antimony (Sb) Tailings by Combined Solid Waste in Southwest China

Han¹,

Han²,

Luo³

et al. 2023

Pol. J. Environ. Stud.

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To explore the feasibility of reusing solid waste to stabilize high-content arsenic (As) and antimony (Sb) tailings, red mud, fly ash, dried sludge, ferrous sulfate (FeSO 4 ), and rice husk ash (RHA) were used as the stabilizer to stabilize the Sb tailings in Qing Long and Du Shan. The combined treatment with 5% red mud, 10% fly ash, 5% dried sludge, 1% FeSO 4 , and 1% rice husk ash had the best stabilization effects on As and Sb, the leaching concentrations of As and Sb decreased considerably under neutral conditions, this indicates that the leaching behavior of As and Sb is controlled by the alkaline and acid-retarding capacity of the materials. In addition, the leaching of heavy metals decreases with the formation of (C-S-H) and calcite (CaCO 3 ), indicating that heavy metals exist in the form of metal hydration or hydroxide and precipitate on the surface of calcium silicate hydrate (C-S-H) and calcite particles. Leaching of heavy metals in stabilized materials can be considered as a pH-dependent and control process of stabilization products.

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“…CCR has been studied for waste gas and wastewater treatment, adsorption of ions [ 8 ], soil treatment [ 9 ], and CO 2 capture [ 10 ]. Some studies [ 11 , 12 , 13 ] have focused on the comprehensive utilization of Ca-containing solid waste, which efficiently solidified the heavy metal and produced an inert and eco-material. Based on these studies, combining the properties of CCR, it is imperative finding a feasible way of reusing CCR to derive environmental, social, and economic benefits from this widespread by-product [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Calcium Carbide Residue as Solid Alkali for Preparing Fly Ash-Based Geopolymers: Dependence of Compressive Strength and Microstructure on Calcium Carbide Residue, Water Content and Curing Temperature

Wang

Guo

et al. 2022

Materials

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Calcium carbide residue (CCR) is a solid waste resulting from acetylene gas production. In this study, CCR was used as an alkali activator to prepare fly ash (FA)-based geopolymers without any alkali supplementation. We studied the factors (FA/CCR ratio, curing temperature, and water/binder ratio) influencing the mechanical property of FA/CCR-based geopolymers. The compressive strength results showed that, by optimizing these three factors, the FA/CCR mixture has great potential for use as a cementitious material and geopolymer with a dense microstructure having a maximal compressive strength of 17.5 MPa. The geopolymers’ chemical structure, microstructure, and chemical composition were characterized and determined by a combination of techniques. All these results revealed that amorphous C-(A)-S-H (calcium (aluminate) silicate hydrate) gels mainly formed after geopolymerization resulting from the reaction of FA and CCR. In addition, some crystallines, such as ettringite and monosulfate, were also formed. Further, geopolymers prepared with a suitable FA/CCR ratio (1:1 or 1:2) possessed a compact microstructure because of their sufficient reactive SiO2 and Al2O3 and high-enough alkalinity, responsible for higher content of C-(A)-S-H formation and better mechanical property. Too high curing temperature or water content induced the formation of a loosely bound geopolymer matrix that strongly weakens its mechanical property.

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Solidification of heavy metals and PCDD/Fs from municipal solid waste incineration fly ash by the polymerization of calcium carbonate oligomers

Cited by 19 publications

References 40 publications

Advances and Outlook of Heavy Metal Treatment Technology from Municipal Solid Waste Incineration Fly Ash: A Review

Advances and Outlook of Heavy Metal Treatment Technology from Municipal Solid Waste Incineration Fly Ash: A Review

<i>In-situ</i> Stability and Remediation of Typical Antimony (Sb) Tailings by Combined Solid Waste in Southwest China

Utilization of Calcium Carbide Residue as Solid Alkali for Preparing Fly Ash-Based Geopolymers: Dependence of Compressive Strength and Microstructure on Calcium Carbide Residue, Water Content and Curing Temperature

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