Sequential electrokinetic treatment and oxalic acid extraction for the removal of Cu, Cr and As from wood

Pirjo Isosaari (Corresponding Author), Pieti Marjavaara, Eila Lehmus

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (Scopus)

    Abstract

    Removal of Cu, Cr and As from utility poles treated with chromated copper arsenate (CCA) was investigated using different one- to three-step combinations of oxalic acid extraction and electrokinetic treatment. The experiments were carried out at room temperature, using 0.8% oxalic acid and 30 V (200 V/m) of direct current (DC) or alternating current in combination (DC/AC). Six-hour extraction removed only 15%, 11% and 28% and 7-day electrokinetic treatment 57%, 0% and 17% of Cu, Cr and As from wood chips, respectively. The best combination for all the metals was a three-step process consisting of pre-extraction, electrokinetics and post-extraction steps, yielding removals of 67% for Cu, 64% for Cr and 81% for As. Oxalic acid extraction prior to electrokinetic treatment was deleterious to further removal of Cu, but it was necessary for Cr and As removal. Chemical equilibrium modelling was used to explain the differences in the behaviour of Cu, Cr and As. Due to the dissimilar nature of these metals, it appeared that even more process sequences and/or stricter control of the process conditions would be needed to obtain the >99% removals required for safe recycling of the purified wood material.
    Original languageEnglish
    Pages (from-to)869-876
    Number of pages8
    JournalJournal of Hazardous Materials
    Volume182
    Issue number1-3
    DOIs
    Publication statusPublished - 2010
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Oxalic Acid
    Oxalic acid
    oxalic acid
    Wood
    Metals
    Recycling
    metal
    arsenate
    Temperature
    Poles
    recycling
    electrokinetics
    removal
    copper
    Copper
    modeling
    experiment
    temperature
    Experiments

    Keywords

    • Chromated copper arsenate
    • Electrodialysis
    • Equilibrium modelling
    • Oxalic acid
    • Utility pole

    Cite this

    Isosaari, Pirjo ; Marjavaara, Pieti ; Lehmus, Eila. / Sequential electrokinetic treatment and oxalic acid extraction for the removal of Cu, Cr and As from wood. In: Journal of Hazardous Materials. 2010 ; Vol. 182, No. 1-3. pp. 869-876.
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    abstract = "Removal of Cu, Cr and As from utility poles treated with chromated copper arsenate (CCA) was investigated using different one- to three-step combinations of oxalic acid extraction and electrokinetic treatment. The experiments were carried out at room temperature, using 0.8{\%} oxalic acid and 30 V (200 V/m) of direct current (DC) or alternating current in combination (DC/AC). Six-hour extraction removed only 15{\%}, 11{\%} and 28{\%} and 7-day electrokinetic treatment 57{\%}, 0{\%} and 17{\%} of Cu, Cr and As from wood chips, respectively. The best combination for all the metals was a three-step process consisting of pre-extraction, electrokinetics and post-extraction steps, yielding removals of 67{\%} for Cu, 64{\%} for Cr and 81{\%} for As. Oxalic acid extraction prior to electrokinetic treatment was deleterious to further removal of Cu, but it was necessary for Cr and As removal. Chemical equilibrium modelling was used to explain the differences in the behaviour of Cu, Cr and As. Due to the dissimilar nature of these metals, it appeared that even more process sequences and/or stricter control of the process conditions would be needed to obtain the >99{\%} removals required for safe recycling of the purified wood material.",
    keywords = "Chromated copper arsenate, Electrodialysis, Equilibrium modelling, Oxalic acid, Utility pole",
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    Sequential electrokinetic treatment and oxalic acid extraction for the removal of Cu, Cr and As from wood. / Isosaari, Pirjo (Corresponding Author); Marjavaara, Pieti; Lehmus, Eila.

    In: Journal of Hazardous Materials, Vol. 182, No. 1-3, 2010, p. 869-876.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Isosaari, Pirjo

    AU - Marjavaara, Pieti

    AU - Lehmus, Eila

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    N2 - Removal of Cu, Cr and As from utility poles treated with chromated copper arsenate (CCA) was investigated using different one- to three-step combinations of oxalic acid extraction and electrokinetic treatment. The experiments were carried out at room temperature, using 0.8% oxalic acid and 30 V (200 V/m) of direct current (DC) or alternating current in combination (DC/AC). Six-hour extraction removed only 15%, 11% and 28% and 7-day electrokinetic treatment 57%, 0% and 17% of Cu, Cr and As from wood chips, respectively. The best combination for all the metals was a three-step process consisting of pre-extraction, electrokinetics and post-extraction steps, yielding removals of 67% for Cu, 64% for Cr and 81% for As. Oxalic acid extraction prior to electrokinetic treatment was deleterious to further removal of Cu, but it was necessary for Cr and As removal. Chemical equilibrium modelling was used to explain the differences in the behaviour of Cu, Cr and As. Due to the dissimilar nature of these metals, it appeared that even more process sequences and/or stricter control of the process conditions would be needed to obtain the >99% removals required for safe recycling of the purified wood material.

    AB - Removal of Cu, Cr and As from utility poles treated with chromated copper arsenate (CCA) was investigated using different one- to three-step combinations of oxalic acid extraction and electrokinetic treatment. The experiments were carried out at room temperature, using 0.8% oxalic acid and 30 V (200 V/m) of direct current (DC) or alternating current in combination (DC/AC). Six-hour extraction removed only 15%, 11% and 28% and 7-day electrokinetic treatment 57%, 0% and 17% of Cu, Cr and As from wood chips, respectively. The best combination for all the metals was a three-step process consisting of pre-extraction, electrokinetics and post-extraction steps, yielding removals of 67% for Cu, 64% for Cr and 81% for As. Oxalic acid extraction prior to electrokinetic treatment was deleterious to further removal of Cu, but it was necessary for Cr and As removal. Chemical equilibrium modelling was used to explain the differences in the behaviour of Cu, Cr and As. Due to the dissimilar nature of these metals, it appeared that even more process sequences and/or stricter control of the process conditions would be needed to obtain the >99% removals required for safe recycling of the purified wood material.

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    KW - Electrodialysis

    KW - Equilibrium modelling

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    U2 - 10.1016/j.jhazmat.2010.06.128

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