Preliminary treatment of MSW fly ash as a way of improving electrodialytic remediation

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Preliminary treatment of MSW fly ash as a way of improving electrodialytic remediation. / Ferreira, Célia Maria Dias; Jensen, Pernille Erland; Ottosen, Lisbeth M.; Ribeiro, Alexandra.

In: Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering, Vol. 43, No. 8, 2008, p. 837-843.

Research output: Contribution to journalJournal article – Annual report year: 2008Researchpeer-review

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@article{acde8ef3482a42179d3d090907c41025,
title = "Preliminary treatment of MSW fly ash as a way of improving electrodialytic remediation",
abstract = "In the current work electrodialytic remediation (EDR) was applied to remove heavy metals from municipal solid waste (MSW) fly ash, a hazardous waste collected during flue gas treatment. Tests were conducted to evaluate if EDR could be improved by introducing a preliminary treatment in which very soluble salts were removed. Three different preliminary treatments were conducted with different L:S ratios and pH. Treatment in which metal release and L/S ratio were lower was selected for EDR. Electrodialytic remediation was performed at a constant current of 38 mA, for 14 days, using gluconate as a solubilisation enhancement agent. Conductivity and pH were monitored and electrolyte samples were collected every 4 days to evaluate metal release over time. It was found that the preliminary treatment reduces fouling of the ion-exchange membranes used in EDR and drastically increases the removal of metals. Remediation time was also considerably reduced. Additionally, preliminary washing reduces energy consumption during EDR, since electric current is not wasted in the transport of soluble salts. Sequential extraction was performed in the untreated and treated samples to help identify how metals are bond to the fly ash. It was seen that at the end metals are mainly found in the strongly bonded and residual phases. This indicates that the combined treatment (washing + EDR) is successful in reducing the environmental risk posed by fly ash.",
author = "Ferreira, {C{\'e}lia Maria Dias} and Jensen, {Pernille Erland} and Ottosen, {Lisbeth M.} and Alexandra Ribeiro",
year = "2008",
doi = "10.1080/10934520801974319",
language = "English",
volume = "43",
pages = "837--843",
journal = "Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering",
issn = "1093-4529",
publisher = "Taylor & Francis Inc.",
number = "8",

}

RIS

TY - JOUR

T1 - Preliminary treatment of MSW fly ash as a way of improving electrodialytic remediation

AU - Ferreira, Célia Maria Dias

AU - Jensen, Pernille Erland

AU - Ottosen, Lisbeth M.

AU - Ribeiro, Alexandra

PY - 2008

Y1 - 2008

N2 - In the current work electrodialytic remediation (EDR) was applied to remove heavy metals from municipal solid waste (MSW) fly ash, a hazardous waste collected during flue gas treatment. Tests were conducted to evaluate if EDR could be improved by introducing a preliminary treatment in which very soluble salts were removed. Three different preliminary treatments were conducted with different L:S ratios and pH. Treatment in which metal release and L/S ratio were lower was selected for EDR. Electrodialytic remediation was performed at a constant current of 38 mA, for 14 days, using gluconate as a solubilisation enhancement agent. Conductivity and pH were monitored and electrolyte samples were collected every 4 days to evaluate metal release over time. It was found that the preliminary treatment reduces fouling of the ion-exchange membranes used in EDR and drastically increases the removal of metals. Remediation time was also considerably reduced. Additionally, preliminary washing reduces energy consumption during EDR, since electric current is not wasted in the transport of soluble salts. Sequential extraction was performed in the untreated and treated samples to help identify how metals are bond to the fly ash. It was seen that at the end metals are mainly found in the strongly bonded and residual phases. This indicates that the combined treatment (washing + EDR) is successful in reducing the environmental risk posed by fly ash.

AB - In the current work electrodialytic remediation (EDR) was applied to remove heavy metals from municipal solid waste (MSW) fly ash, a hazardous waste collected during flue gas treatment. Tests were conducted to evaluate if EDR could be improved by introducing a preliminary treatment in which very soluble salts were removed. Three different preliminary treatments were conducted with different L:S ratios and pH. Treatment in which metal release and L/S ratio were lower was selected for EDR. Electrodialytic remediation was performed at a constant current of 38 mA, for 14 days, using gluconate as a solubilisation enhancement agent. Conductivity and pH were monitored and electrolyte samples were collected every 4 days to evaluate metal release over time. It was found that the preliminary treatment reduces fouling of the ion-exchange membranes used in EDR and drastically increases the removal of metals. Remediation time was also considerably reduced. Additionally, preliminary washing reduces energy consumption during EDR, since electric current is not wasted in the transport of soluble salts. Sequential extraction was performed in the untreated and treated samples to help identify how metals are bond to the fly ash. It was seen that at the end metals are mainly found in the strongly bonded and residual phases. This indicates that the combined treatment (washing + EDR) is successful in reducing the environmental risk posed by fly ash.

U2 - 10.1080/10934520801974319

DO - 10.1080/10934520801974319

M3 - Journal article

VL - 43

SP - 837

EP - 843

JO - Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering

JF - Journal of Environmental Science and Health. Part A: Toxic Hazardous Substances and Environmental Engineering

SN - 1093-4529

IS - 8

ER -