Electrodialytic Arsenic Removal from Bulk and Pre-treated Soil

Ana Rita Ferreira*, Nazare Couto, Alexandra B. Ribeiro, Lisbeth M. Ottosen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Arsenic (As) is a well-known highly toxic and carcinogenic element. A combination of electrodialytic remediation (EDR) after soil washing with flocculant addition targeting remediation of a soil polluted with As from wood preservation industry is the focus of this paper. The fine fraction (<0.063mm) from the washed soil after dry sieving was also considered. The EDR experiments were carried out in a 2-compartment cell applying 0.01mA/cm2 during 14, 7 and 3days. The suspended soil slurry was placed in cathode compartment separated by anion exchange membrane (AEM) of the anolyte where the pH was kept at 10. The soil was highly polluted with As, and the EDR was able to remove between 50 and 80% corresponding to 400-478mg As/kg of soil. The major part of the As was removed within the first 3days (63%), and approx. 10% more of As was released doubling the time of the experiment: 72% in 7days and 80% in 14days. The pre-treated soil showed higher As initial concentration, but did not show a clear advantage in terms of removal rate as the original soil (not washed or sieved) showed 80% of As removal comparing with 61% and 50% for washed and fine fraction, respectively (although the absolute removed concentration was similar). The sequential extraction results confirmed that As was bound into more mobile fractions in original soil, and the higher removal was mainly due to its larger exchangeable and reducible fractions compared to the oxidizable and residual fraction in pre-treated soil.
Original languageEnglish
JournalWater, Air and Soil Pollution
Volume230
Issue number4
Pages (from-to)1-11
Number of pages11
ISSN0049-6979
DOIs
Publication statusPublished - 2019

Keywords

  • Arsenic
  • Electrodialytic remediation
  • Soil contamination
  • Soil washing

Cite this

Ferreira, Ana Rita ; Couto, Nazare ; Ribeiro, Alexandra B. ; Ottosen, Lisbeth M. / Electrodialytic Arsenic Removal from Bulk and Pre-treated Soil. In: Water, Air and Soil Pollution. 2019 ; Vol. 230, No. 4. pp. 1-11.
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abstract = "Arsenic (As) is a well-known highly toxic and carcinogenic element. A combination of electrodialytic remediation (EDR) after soil washing with flocculant addition targeting remediation of a soil polluted with As from wood preservation industry is the focus of this paper. The fine fraction (<0.063mm) from the washed soil after dry sieving was also considered. The EDR experiments were carried out in a 2-compartment cell applying 0.01mA/cm2 during 14, 7 and 3days. The suspended soil slurry was placed in cathode compartment separated by anion exchange membrane (AEM) of the anolyte where the pH was kept at 10. The soil was highly polluted with As, and the EDR was able to remove between 50 and 80{\%} corresponding to 400-478mg As/kg of soil. The major part of the As was removed within the first 3days (63{\%}), and approx. 10{\%} more of As was released doubling the time of the experiment: 72{\%} in 7days and 80{\%} in 14days. The pre-treated soil showed higher As initial concentration, but did not show a clear advantage in terms of removal rate as the original soil (not washed or sieved) showed 80{\%} of As removal comparing with 61{\%} and 50{\%} for washed and fine fraction, respectively (although the absolute removed concentration was similar). The sequential extraction results confirmed that As was bound into more mobile fractions in original soil, and the higher removal was mainly due to its larger exchangeable and reducible fractions compared to the oxidizable and residual fraction in pre-treated soil.",
keywords = "Arsenic, Electrodialytic remediation, Soil contamination, Soil washing",
author = "Ferreira, {Ana Rita} and Nazare Couto and Ribeiro, {Alexandra B.} and Ottosen, {Lisbeth M.}",
year = "2019",
doi = "10.1007/s11270-019-4116-y",
language = "English",
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Electrodialytic Arsenic Removal from Bulk and Pre-treated Soil. / Ferreira, Ana Rita; Couto, Nazare; Ribeiro, Alexandra B.; Ottosen, Lisbeth M.

In: Water, Air and Soil Pollution, Vol. 230, No. 4, 2019, p. 1-11.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Electrodialytic Arsenic Removal from Bulk and Pre-treated Soil

AU - Ferreira, Ana Rita

AU - Couto, Nazare

AU - Ribeiro, Alexandra B.

AU - Ottosen, Lisbeth M.

PY - 2019

Y1 - 2019

N2 - Arsenic (As) is a well-known highly toxic and carcinogenic element. A combination of electrodialytic remediation (EDR) after soil washing with flocculant addition targeting remediation of a soil polluted with As from wood preservation industry is the focus of this paper. The fine fraction (<0.063mm) from the washed soil after dry sieving was also considered. The EDR experiments were carried out in a 2-compartment cell applying 0.01mA/cm2 during 14, 7 and 3days. The suspended soil slurry was placed in cathode compartment separated by anion exchange membrane (AEM) of the anolyte where the pH was kept at 10. The soil was highly polluted with As, and the EDR was able to remove between 50 and 80% corresponding to 400-478mg As/kg of soil. The major part of the As was removed within the first 3days (63%), and approx. 10% more of As was released doubling the time of the experiment: 72% in 7days and 80% in 14days. The pre-treated soil showed higher As initial concentration, but did not show a clear advantage in terms of removal rate as the original soil (not washed or sieved) showed 80% of As removal comparing with 61% and 50% for washed and fine fraction, respectively (although the absolute removed concentration was similar). The sequential extraction results confirmed that As was bound into more mobile fractions in original soil, and the higher removal was mainly due to its larger exchangeable and reducible fractions compared to the oxidizable and residual fraction in pre-treated soil.

AB - Arsenic (As) is a well-known highly toxic and carcinogenic element. A combination of electrodialytic remediation (EDR) after soil washing with flocculant addition targeting remediation of a soil polluted with As from wood preservation industry is the focus of this paper. The fine fraction (<0.063mm) from the washed soil after dry sieving was also considered. The EDR experiments were carried out in a 2-compartment cell applying 0.01mA/cm2 during 14, 7 and 3days. The suspended soil slurry was placed in cathode compartment separated by anion exchange membrane (AEM) of the anolyte where the pH was kept at 10. The soil was highly polluted with As, and the EDR was able to remove between 50 and 80% corresponding to 400-478mg As/kg of soil. The major part of the As was removed within the first 3days (63%), and approx. 10% more of As was released doubling the time of the experiment: 72% in 7days and 80% in 14days. The pre-treated soil showed higher As initial concentration, but did not show a clear advantage in terms of removal rate as the original soil (not washed or sieved) showed 80% of As removal comparing with 61% and 50% for washed and fine fraction, respectively (although the absolute removed concentration was similar). The sequential extraction results confirmed that As was bound into more mobile fractions in original soil, and the higher removal was mainly due to its larger exchangeable and reducible fractions compared to the oxidizable and residual fraction in pre-treated soil.

KW - Arsenic

KW - Electrodialytic remediation

KW - Soil contamination

KW - Soil washing

U2 - 10.1007/s11270-019-4116-y

DO - 10.1007/s11270-019-4116-y

M3 - Journal article

VL - 230

SP - 1

EP - 11

JO - Water, Air and Soil Pollution

JF - Water, Air and Soil Pollution

SN - 0049-6979

IS - 4

ER -