A comparative study on solidification/stabilization characteristics of coal fly ash-based geopolymer and Portland cement on heavy metals in MSWI fly ash

Fan, Chengcheng; Wang, Baomin; Ai, Hongmei; Qi, Yi; Liu, Ze

doi:10.1016/j.jclepro.2021.128790

Cited by 144 publications

(19 citation statements)

References 43 publications

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“…Sun et al [ 60 ] used sludge residue to synthesize geopolymer and achieved a high-efficient immobilization of the unstable forms of Zn. It is also reported that the immobilization rate of more than 99% for Zn can be achieved by geopolymer-based S/S [ 61 ]. Similarly, the alkaline condition of the geopolymer plays an important role in the S/S of Zn.…”

Section: Geopolymer-based S/s Processmentioning

confidence: 99%

Application of Geopolymer in Stabilization/Solidification of Hazardous Pollutants: A Review

et al. 2022

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Geopolymers, as a kind of inorganic polymer, possess excellent properties and have been broadly studied for the stabilization/solidification (S/S) of hazardous pollutants. Even though many reviews about geopolymers have been published, the summary of geopolymer-based S/S for various contaminants has not been well conducted. Therefore, the S/S of hazardous pollutants using geopolymers are comprehensively summarized in this review. Geopolymer-based S/S of typical cations, including Pb, Zn, Cd, Cs, Cu, Sr, Ni, etc., were involved and elucidated. The S/S mechanisms for cationic heavy metals were concluded, mainly including physical encapsulation, sorption, precipitation, and bonding with a silicate structure. In addition, compared to cationic ions, geopolymers have a poor immobilization ability on anions due to the repulsive effect between them, presenting a high leaching percentage. However, some anions, such as Se or As oxyanions, have been proved to exist in geopolymers through electrostatic interaction, which provides a direction to enhance the geopolymer-based S/S for anions. Besides, few reports about geopolymer-based S/S of organic pollutants have been published. Furthermore, the adsorbents of geopolymer-based composites designed and studied for the removal of hazardous pollutants from aqueous conditions are also briefly discussed. On the whole, this review will offer insights into geopolymer-based S/S technology. Furthermore, the challenges to geopolymer-based S/S technology outlined in this work are expected to be of direct relevance to the focus of future research.

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Section: Geopolymer-based S/s Processmentioning

confidence: 99%

Application of Geopolymer in Stabilization/Solidification of Hazardous Pollutants: A Review

et al. 2022

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“…Moreover, this technique showed a satisfactory HMs stabilization efficiency over the course of time. In a study conducted by Fan et al [39], the solidification of MSWI fly ash using Portland cement and coal fly ash-based geopolymer was investigated. Based on the leaching test results, under geopolymer treatment, the immobilization rates of Pb, Zn, and Cd were more than 99%.…”

Section: Solidification/stabilizationmentioning

confidence: 99%

Heavy metals removal/stabilization from municipal solid waste incineration fly ash: a review and recent trends

Ajorloo

Ghodrat

Scott

et al. 2022

J Mater Cycles Waste Manag

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Waste treatment using thermal technologies, such as incineration, leads to the production of pollutants and wastes, including fly ash (FA). Fly ash contains heavy metals (HMs) and other contaminants and can potentially pose high risks to the environment and negatively impact health and safety. Consequently, stabilizing fly ash prior to either use or landfilling is crucial. The toxicity of fly ash through heavy metal leaching can be assessed using leaching tests. The leaching rates of heavy metals primarily depend on the surrounding conditions as well as fly ash properties and metal speciation. Physical separation, leaching or extraction, thermal treatment and solidification/chemical stabilization are proposed as suitable approaches for fly ash treatment. Economic considerations, environmental concerns, energy consumption and processing times can define the efficiency and selection of the treatment approach. This review considers the latest findings and compares the advantages and shortcomings of different fly ash treatment methods with the aim of highlighting the recent advances in the field. The review concludes that the simultaneous implementation of various methods can lead to highly efficient heavy metals removal/stabilization while simultaneously taking economic and environmental considerations into account.

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“…Fan et al believed that MSW fly ash is basically an aluminosilicate material. 9 Therefore, it could be reused as cementitious materials, soil amendment or light-weight aggregate in construction and road pavement materials. 10 However, it is important to remove harmful elements before fly ash can be reused.…”

Section: Introductionmentioning

confidence: 99%

Controlling reactions during heavy metal leaching from municipal solid waste incineration fly ash

Chen

Wang

et al. 2023

JSCS

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This research aimed to characterize the physical, chemical properties of municipal solid waste incineration fly ash and investigate the leaching of heavy metals during Toxicity Characteristics Leaching Procedure (TCLP) process. To understand the leaching behavior, concentrations of heavy metals, chloride, sulfate and calcium at various leaching time was monitored together with pH of the leaching solution. Results showed that chemical compositions of fly ashes led to differences in leaching environment. For the two fly ashes under study, one resulted in a leaching environment of pH of 10-12 while the other had a pH about 6-7. Based on pH, anions and cations concentrations, Minteq software was employed to investigate the speciation of heavy metals. Results showed that the shift in precipitation/dissolution balance of carbonate and hydroxides of heavy metals could explain the fluctuation in metal concentrations during the leaching process. This indicates that leaching was probably controlled by these reactions. On the other hand, addition of EDTA changed the controlling reactions. Chelating reactions between heavy metals and EDTA led to much higher leaching toxicity of heavy metals showing that presence of chelating organics in natural environment may facilitate heavy metal leaching.

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A comparative study on solidification/stabilization characteristics of coal fly ash-based geopolymer and Portland cement on heavy metals in MSWI fly ash

Cited by 144 publications

References 43 publications

Application of Geopolymer in Stabilization/Solidification of Hazardous Pollutants: A Review

Application of Geopolymer in Stabilization/Solidification of Hazardous Pollutants: A Review

Heavy metals removal/stabilization from municipal solid waste incineration fly ash: a review and recent trends

Controlling reactions during heavy metal leaching from municipal solid waste incineration fly ash

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