Enhanced Pb and Zn stabilization in municipal solid waste incineration fly ash using waste fishbone hydroxyapatite

Nag, Mitali; Saffarzadeh, Amirhomayoun; Nomichi, Takeshi; Shimaoka, Takayuki; Nakayama, Hirofumi

doi:10.1016/j.wasman.2020.08.026

Cited by 30 publications

(6 citation statements)

References 53 publications

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“…All crystallisation salts were mainly chloride salts and small portion of sulphate salts. This was mainly due to the Cl content of MSW being higher than the S content (Liu et al, 2021; Nag et al, 2020), and most of the sulphate compounds were insoluble. The chloride compounds of GFAS were NaCl and KCl.…”

Section: Resultsmentioning

confidence: 99%

Experimental study on the washing characteristics of fly ash from municipal solid waste incineration

et al. 2021

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The disposal of fly ash with high salt content has become an important bottleneck for the further application of municipal solid waste incineration (MSWI). In this study, the soluble salt content and composition of fly ash from different MSWI were analysed. The composition of fly ash was affected by incinerator type and flue gas cleaning system, especially the type of deacidification solvent. The soluble salt content in fly ash from MSW grate incinerator can be over 35.16%. Most of the soluble salt was calcium salt and chloride salt. The effect of washing parameters including liquid/solid (L/S) ratio and washing time on salt removal from fly ash were studied. Raw fly ash contained high chlorine (Cl) with the maximum of 19.83% and it can be significantly reduced by washing. Double-washing and secondary-washing had better performance than single-washing on salt removal. The secondary-washing did not only save water, but also reduced the energy cost during evaporation for crystallising soluble salt. Based on the analysis of variance (ANOVA), L/S ratio was the most principal factor for salt and Cl removal of fly ash by washing.

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Section: Resultsmentioning

confidence: 99%

Experimental study on the washing characteristics of fly ash from municipal solid waste incineration

et al. 2021

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“…The sieving method was used to separate the ground fishbone into three particle size fractions (<600 µm, 600 µm-2 mm, and 0-2 mm). The details of the fishbone processing have been explained elsewhere [17].…”

Section: Collection and Preparation Of Fishbone And Fly Ashmentioning

confidence: 99%

“…6) were found to be homogenously distributed in the treated IFA particles. It is difficult to detect the newly-constituted compounds in the host medium, particularly the immensely scattered or as ultrafine aggregates [17].…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Degree of Pb stabilization in MSWI fly ash using size-fractionated natural fishbone hydroxyapatite

Nag

Saffarzadeh

SHİMAOKA

et al. 2022

Environmental Research and Technology

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Incineration is a common technique worldwide for treating Municipal Solid Waste (MSW). However, incineration residues (e.g., bottom and fly ash) require special treatment to prevent environmental risks due to the high content of heavy metals. The present study evaluated the stabilization degree of Pb, a toxic heavy metal in MSW incineration fly ash (IFA) treating by size-fractionated natural fishbone (FB) hydroxyapatite (HA). Bones from various fish species were used at different size fractions (<600 µm, 600 µm-2 mm, and 0-2 mm). The effect of different fishbone hydroxyapatite (FB-HA) sizes was studied by batch tests under the FB/IFA ratios of 0.0 and 1:10 (wt.), the contact or settling time of 6, 12, 24, and 672 hours, and the fixed W/S ratio of 1.5 mL/g. Using only 10% FB, Pb stabilization efficiency after 672 hours obtained 95.55% and 94.24% for FB sizes <600 µm and 600 µm-2 mm, respectively, and about 86.1% for non-fractionated FB (0-2 mm). The results indicated that contact time was the most critical factor for enhanced Pb stabilization. The FB particle size of 0-2 mm was deemed appropriate for Pb immobilization in short and long time settling periods. The adsorption isotherms were fitted well with the Langmuir and Freundlich models. The R L values of the Langmuir model were less than one and the n values of the Freundlich isotherm lie between 3 and 5, conferring the favorable adsorption of Pb to FB-HA for all size fractions.

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“…For managing and stabilizing the MSWI FA, new stabilization treatment techniques using waste and by-products have been promoted in recent years. FA mixed with rice husk (Bosio et al, 2014), silica fume (Rodella et al, 2017), residues of electrolytic manganese (Zhan et al, 2018), biochemical effluents , red mud (Li et al, 2019), sewage sludge ash (Benassi et al, 2019), and waste fishbone (Nag et al, 2020;Mu et al, 2018) as some of the most recent treatment technologies.…”

Section: Introductionmentioning

confidence: 99%

Feasibility of Natural Zeolite for Heavy Metal Stabilization in Municipal Solid Waste Incineration Fly Ash: A Novel Approach

Nag¹,

Saffarzadeh²,

Shimaoka³

2022

GEP

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The current study investigated the sorption process of heavy metals, especially lead (Pb 2+ ) and Zinc (Zn 2+ ), in Municipal Solid Waste Incineration (MSWI) fly ash applying natural zeolite, namely mordenite, as an inexpensive adsorbent to assess its feasibility for the treatment of fly ash. Batch experiments were performed to investigate the effects of the influential parameters, such as metals initial ion concentration, dosage of adsorbent, liquid to solid (L/S) ratio, and equilibrium concentration of metal on the immobilization of Pb 2+ and Zn 2+ , in a novel approach. Heavy metals removal efficiency increased with increasing the dosage of mordenite influenced by the media-specific surface area. Heavy metals adsorption is ascribed to various mechanisms of ion exchange and adsorption processes. The Langmuir and Freundlich isotherm models were investigated using the adsorption data. The adsorption process describes better in the Freundlich isotherm model compared to the Langmuir isotherm model with a high determination coefficient (R 2 ), especially for the adsorption of Pb 2+ . In addition, the affinity of mordenite to Pb 2+ was shown to be higher than that of Zn 2+ . This allows the use of mordenite to capture of Pb 2+ in MSWI fly ash. Results raise expectations about using mordenite as a low-cost material for treating MSWI fly ashes. The results show that heavy metal (Pb 2+ and Zn 2+ ) removed by mordenite adsorbent is practical and effective. In order to achieve the higher efficiency on heavy metal stabilization in MSWI fly ash, additional experiments are necessary.

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Enhanced Pb and Zn stabilization in municipal solid waste incineration fly ash using waste fishbone hydroxyapatite

Cited by 30 publications

References 53 publications

Experimental study on the washing characteristics of fly ash from municipal solid waste incineration

Experimental study on the washing characteristics of fly ash from municipal solid waste incineration

Degree of Pb stabilization in MSWI fly ash using size-fractionated natural fishbone hydroxyapatite

Feasibility of Natural Zeolite for Heavy Metal Stabilization in Municipal Solid Waste Incineration Fly Ash: A Novel Approach

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