Remediation of Zn(II)- and Cu(II)-Contaminated Soil Using Citric Acid and Citric Acid-Containing Wastewater

Fan Gu, Yu Zhang, Qiang Tang*, Cong Lu, Ting Zhou

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

This study investigated the desorption behavior of heavy metals, Zn(II) and Cu(II), in the contaminated soil using citric acid and citric acid-containing wastewater (CACW). Four influence factors, including soil contamination levels, dosage of citric acid, reaction time and soil pH were taken into account. Using the citric acid, the desorption reaction with heavy metals was rapid (i.e., less than 2 h). The removal percentage of Zn(II) and Cu(II) reached more than 90% for one type of Suzhou clay with a pH value of 6.58 and a contaminated level of Zn > 2.7 mg/g and Cu > 3.3 mg/g. The increase of soil pH inhibited the metal desorption. The desorption behavior predicted by Visual MINTEQ was in good agreement with the experimental results. The desorption behavior of Zn(II) and Cu(II) was governed by the affinity of sorption sites for heavy metals and the chelating of organic ligands. Soil contamination levels and contact time were investigated when using CACW as the desorbent. It was concluded that CACW was also effective in extracting Zn(II) and Cu(II) from soil surface. When the contact time between CACW and contaminated soil reached 2 h, the removal percentage of Zn(II) and Cu(II) increased to 33% and 60%, respectively. As a result, CACW that is usually treated as a waste product can be a promising washing solution for soil remediation.

Original languageEnglish
Pages (from-to)1607-1619
Number of pages13
JournalInternational Journal of Civil Engineering
Volume16
Issue number11
Early online date10 Apr 2018
DOIs
Publication statusPublished - 1 Nov 2018

Fingerprint

Citric acid
Remediation
Wastewater
Soils
Desorption
Heavy metals
Contamination
Chelation
Washing
Sorption
Clay
Ligands
Metals

Keywords

  • Citric acid
  • Citric acid-containing wastewater
  • Cu(II)
  • Desorption
  • Zn(II)

Cite this

Gu, F., Zhang, Y., Tang, Q., Lu, C., & Zhou, T. (2018). Remediation of Zn(II)- and Cu(II)-Contaminated Soil Using Citric Acid and Citric Acid-Containing Wastewater. International Journal of Civil Engineering, 16(11), 1607-1619. https://doi.org/10.1007/s40999-018-0300-5
Gu, Fan ; Zhang, Yu ; Tang, Qiang ; Lu, Cong ; Zhou, Ting. / Remediation of Zn(II)- and Cu(II)-Contaminated Soil Using Citric Acid and Citric Acid-Containing Wastewater. In: International Journal of Civil Engineering. 2018 ; Vol. 16, No. 11. pp. 1607-1619.
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abstract = "This study investigated the desorption behavior of heavy metals, Zn(II) and Cu(II), in the contaminated soil using citric acid and citric acid-containing wastewater (CACW). Four influence factors, including soil contamination levels, dosage of citric acid, reaction time and soil pH were taken into account. Using the citric acid, the desorption reaction with heavy metals was rapid (i.e., less than 2 h). The removal percentage of Zn(II) and Cu(II) reached more than 90{\%} for one type of Suzhou clay with a pH value of 6.58 and a contaminated level of Zn > 2.7 mg/g and Cu > 3.3 mg/g. The increase of soil pH inhibited the metal desorption. The desorption behavior predicted by Visual MINTEQ was in good agreement with the experimental results. The desorption behavior of Zn(II) and Cu(II) was governed by the affinity of sorption sites for heavy metals and the chelating of organic ligands. Soil contamination levels and contact time were investigated when using CACW as the desorbent. It was concluded that CACW was also effective in extracting Zn(II) and Cu(II) from soil surface. When the contact time between CACW and contaminated soil reached 2 h, the removal percentage of Zn(II) and Cu(II) increased to 33{\%} and 60{\%}, respectively. As a result, CACW that is usually treated as a waste product can be a promising washing solution for soil remediation.",
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Gu, F, Zhang, Y, Tang, Q, Lu, C & Zhou, T 2018, 'Remediation of Zn(II)- and Cu(II)-Contaminated Soil Using Citric Acid and Citric Acid-Containing Wastewater', International Journal of Civil Engineering, vol. 16, no. 11, pp. 1607-1619. https://doi.org/10.1007/s40999-018-0300-5

Remediation of Zn(II)- and Cu(II)-Contaminated Soil Using Citric Acid and Citric Acid-Containing Wastewater. / Gu, Fan; Zhang, Yu; Tang, Qiang; Lu, Cong; Zhou, Ting.

In: International Journal of Civil Engineering, Vol. 16, No. 11, 01.11.2018, p. 1607-1619.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Remediation of Zn(II)- and Cu(II)-Contaminated Soil Using Citric Acid and Citric Acid-Containing Wastewater

AU - Gu, Fan

AU - Zhang, Yu

AU - Tang, Qiang

AU - Lu, Cong

AU - Zhou, Ting

PY - 2018/11/1

Y1 - 2018/11/1

N2 - This study investigated the desorption behavior of heavy metals, Zn(II) and Cu(II), in the contaminated soil using citric acid and citric acid-containing wastewater (CACW). Four influence factors, including soil contamination levels, dosage of citric acid, reaction time and soil pH were taken into account. Using the citric acid, the desorption reaction with heavy metals was rapid (i.e., less than 2 h). The removal percentage of Zn(II) and Cu(II) reached more than 90% for one type of Suzhou clay with a pH value of 6.58 and a contaminated level of Zn > 2.7 mg/g and Cu > 3.3 mg/g. The increase of soil pH inhibited the metal desorption. The desorption behavior predicted by Visual MINTEQ was in good agreement with the experimental results. The desorption behavior of Zn(II) and Cu(II) was governed by the affinity of sorption sites for heavy metals and the chelating of organic ligands. Soil contamination levels and contact time were investigated when using CACW as the desorbent. It was concluded that CACW was also effective in extracting Zn(II) and Cu(II) from soil surface. When the contact time between CACW and contaminated soil reached 2 h, the removal percentage of Zn(II) and Cu(II) increased to 33% and 60%, respectively. As a result, CACW that is usually treated as a waste product can be a promising washing solution for soil remediation.

AB - This study investigated the desorption behavior of heavy metals, Zn(II) and Cu(II), in the contaminated soil using citric acid and citric acid-containing wastewater (CACW). Four influence factors, including soil contamination levels, dosage of citric acid, reaction time and soil pH were taken into account. Using the citric acid, the desorption reaction with heavy metals was rapid (i.e., less than 2 h). The removal percentage of Zn(II) and Cu(II) reached more than 90% for one type of Suzhou clay with a pH value of 6.58 and a contaminated level of Zn > 2.7 mg/g and Cu > 3.3 mg/g. The increase of soil pH inhibited the metal desorption. The desorption behavior predicted by Visual MINTEQ was in good agreement with the experimental results. The desorption behavior of Zn(II) and Cu(II) was governed by the affinity of sorption sites for heavy metals and the chelating of organic ligands. Soil contamination levels and contact time were investigated when using CACW as the desorbent. It was concluded that CACW was also effective in extracting Zn(II) and Cu(II) from soil surface. When the contact time between CACW and contaminated soil reached 2 h, the removal percentage of Zn(II) and Cu(II) increased to 33% and 60%, respectively. As a result, CACW that is usually treated as a waste product can be a promising washing solution for soil remediation.

KW - Citric acid

KW - Citric acid-containing wastewater

KW - Cu(II)

KW - Desorption

KW - Zn(II)

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Gu F, Zhang Y, Tang Q, Lu C, Zhou T. Remediation of Zn(II)- and Cu(II)-Contaminated Soil Using Citric Acid and Citric Acid-Containing Wastewater. International Journal of Civil Engineering. 2018 Nov 1;16(11):1607-1619. https://doi.org/10.1007/s40999-018-0300-5