Electrodialytic remediation of municipal solid waste incineration fly ash as pre-treatment before geopolymerisation with coal fly ash

Zhan, Xinyuan; Kirkelund, Gunvor Marie

doi:10.1016/j.jhazmat.2021.125220

Cited by 48 publications

(10 citation statements)

References 40 publications

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“…Based on the use of a geopolymer system for multiple disposal of EMR, reductions in the amount of FA, compressive strength with reference to MU7.5 in the General Specification for Masonry Structures, the overall design of the test, as well as optimization of the data from the Design-Expert software, the predicted values of the mathematical simulation and optimization ratios were obtained, as shown in Table 6 . In terms of prior studies, Zhan et al [ 24 ] used 75 wt% FA and 25 wt% EMR to prepare geopolymer to cure heavy metals. Wang et al [ 30 ] (10% doped EMR) replaced a portion of FA with 10% EMR to prepare a gelling material with a strong adsorption effect on Mn 2+ .…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Electrolytic Manganese Slag–Solid Waste-Based Geopolymers: Compressive Strength and Mn Immobilization

Mi,

Zhao,

et al. 2024

Materials

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The massive stockpiling of electrolytic manganese residue (EMR) has caused serious environmental pollution. In this study, EMR, coal gangue (CG), and fly ash (FA) were used as raw materials to obtain the optimal mix ratio based on Design-Expert mixture design. The effects of activator modulus, liquid–solid (L/S) ratio, and curing temperature on the mechanical properties of geopolymers were investigated. The results showed that the compressive strength of the prepared geopolymer was 12.0 MPa, and the 28d leaching of Mn was 0.123 mg/L under the conditions of EMR:CG:FA = 0.43:0.34:0.23, L/S = 0.9, a curing temperature of 60 °C, and a curing time of 24 h. This indicates that the geopolymer is an environmentally friendly material with high compressive strength. The mineral composition of the geopolymer is mainly hydrated calcium silicate and geopolymer gel. In addition, a more stable new mineral phase, MnSiO3, was generated. The Fourier transform infrared (FTIR) spectrogram showed that the peak at 1100 m−1 was shifted to 1112 cm−1, which indicated that a geopolymerization reaction had occurred. Through scanning electron microscopy (SEM) and energy dispersive spectrum (EDS) analysis, it was identified that the geopolymerization produced a large amount of amorphous gelatinous substances with a relatively dense structure, the major elements being oxygen, silicon, aluminum, calcium, and sodium.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Electrolytic Manganese Slag–Solid Waste-Based Geopolymers: Compressive Strength and Mn Immobilization

Mi,

Zhao,

et al. 2024

Materials

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“…However, the heat-cured regime can be used for the construction of precast members but is regarded as limitated for cast-in-situ applications. Moreover, the previous studies [ 3 , 8 , 9 ] on MSWIFA/PFA blended geopolymers developed a strength of less than 16 MPa, which does not meet the requirement for structural applications.…”

Section: Introductionmentioning

confidence: 93%

“…Recently, geopolymer science has been applied to immobilize heavy metals presented in MSWIFA. It has been found that heavy metals were successfully immobilized in geopolymer binders made with various raw materials, including metakaolin [ 3 ], red mud [ 7 ], coal gangue [ 8 ], and pulverized fly ash (PFA) [ 9 ]. Among these materials, PFA (a byproduct generated during the burning of coal in power stations) is one of the most commonly used raw materials for manufacturing geopolymers.…”

Section: Introductionmentioning

confidence: 99%

“…In the first part, the chemical and physical characteristics of pure MSWIFA, including particle size, morphology, corrosivity, and mineral composites, were characterized. A water immersion method was employed to pretreat MSWI fly ash for solving the volume expansion of MSWIFA/PFA blended geopolymers, which does not require the expensive electrodialytic equipment used in the previous study [ 9 ]. Then, the feasibility of preparing the binder with treated MSWIFA and PFA under an ambient curing regime was explored.…”

Section: Introductionmentioning

confidence: 99%

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Use of Municipal Solid Waste Incineration Fly Ash in Geopolymer Masonry Mortar Manufacturing

et al. 2022

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The feasibility of partially replacing pulverized fly ash (PFA) with municipal solid waste incineration fly ash (MSWIFA) to produce ambient-cured geopolymers was investigated. The influence of mixture design parameters on the compressive strength of geopolymer paste was studied. The investigated parameters included MSWIFA dosage, the ratio of sodium silicate to sodium hydroxide (SS/SH), the ratio of liquid to solid (L/S) alkaline activator, and the ratio of SH molar. A water immersion method was selected as a pretreatment process for MSWIFA, leading to effectively maintaining the volume stability of the MSWIFA/PFA geopolymer. The mixture of 30% treated MSWIFA and 70% PFA with 12 M SS, 0.5 L/S ratio, and 3.0 SS/SH ratio produced the highest three-day compressive strength (4.9 MPa). Based on the optimal paste mixture, category four masonry mortars (according to JGJT98-2011) were prepared to replace various ratios of natural sand with fine recycling glasses. Up to a 30% replacement ratio, the properties of the mortars complied with the limits established by JGJT98-2011. The twenty-eight-day leaching rate of mortars containing 30% MSWIFA was lower than the limits proposed by GB5085.3-2007. Microstructural analysis indicated that the main reaction product was a combination of calcium silicate hydrate gel and aluminosilicate gel.

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“…24 Absorbances centered at 2510, 2360, 1795, 1451 and 875 cm -1 are caused by vibrations of CO3 2-(carbonates). 25 Peaks at 1120 cm -1 and 660 cm -1 indicated vibration stretching of S-O bonds and SO3 2-(sulfates), respectively. 26 Besides, Si-O bonds were observed at 560 cm -1 .…”

Section: Fly Ash Characterizationmentioning

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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Electrodialytic remediation of municipal solid waste incineration fly ash as pre-treatment before geopolymerisation with coal fly ash

Cited by 48 publications

References 40 publications

Synthesis of Electrolytic Manganese Slag–Solid Waste-Based Geopolymers: Compressive Strength and Mn Immobilization

Synthesis of Electrolytic Manganese Slag–Solid Waste-Based Geopolymers: Compressive Strength and Mn Immobilization

Use of Municipal Solid Waste Incineration Fly Ash in Geopolymer Masonry Mortar Manufacturing

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

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