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Remediation of CCA-C treated wood using chelating agents

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Abstract

This study evaluates the effects of the common chelating agents, ethylenediaminetetracetic acid (EDTA), nitrilotriacetic acid (NTA), and oxalic acid (OA) on the removal of copper, chromium, and arsenic from CCA-C treated wood. In the study, the removal of the metal oxides from treated chips and sawdust by EDTA and NTA in conjunction with OA in dual extraction processes was investigated using batch-leaching experiments. Exposing CCA-C treated chips and sawdust to chelat extraction enhanced the removal of CCA-C components compared to extraction by deionized water. Grinding CCA-C treated wood chips into 40-mesh sawdust provided greater access to and removal of CCA-C components. Extraction with EDTA/OA and NTA/OA in dual extraction processes removed about 100% copper and arsenic and 90% chromium from CCA-C treated sawdust. However dual extraction of CCA-C treated chips resulted in about 80% copper and arsenic, and 70% chromium removal. In single extraction processes, EDTA and NTA removed significant amounts of copper from CCA-C treated chips and sawdust compared to other components.

Zusammenfassung

Der Effekt von chelierenden Agenzien wird abgeschätzt. Zum Einsatz kamen Ethylendiamintetraacetat (EDTA), Nitriloessigsäure (NTA) und Oxalsäure (OA) zum Entfernen von Kupfer, Chrom und Arsen aus CCA-C-behandelten Spänen und Sägemehl. Untersucht wurde das Entfernen der Metalloxide mit EDTA und NTA in Kombination mit Oxalsäure in einer zweifachen Extraktion im Batchverfahren. Der Zusatz von Chelaten zu CCA-C-behandelten Spänen und Sägemehl verbessert die Entfernung von CCA-C-Komponenten im Vergleich zur Extraktion mit deionisiertem Wasser. Die Doppelte Extraktion entfernte Kupfer zu 100% und Chrom zu 90% aus CCA-C-benadeltem Sägemehl. Dagenen wurden aus Spänen nur 80% Kupfer und 70% Chrom entfernt. Auch die einfache Extraktion entfernt bereits beträchtliche Mengen an Kupfer im Vergleich zu den anderen Komponenten aus dem behandelten Holz.

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Authors and Affiliations

  1. Wood Research Institute, Kyoto University, Gokasho, Uji 611-001, Kyoto, Japan

    S. N. Kartal

  2. Department of Forest Biology and Wood Protection Technology, Forestry Faculty, Istanbul University, Bahcekoy 80895 , Istanbul, Turkey

    C. Kose

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  1. S. N. Kartal
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  2. C. Kose
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Correspondence to S. N. Kartal.

Additional information

The authors acknowledge the support of Toktas Wood Impregnation Inc. and Unipole Forest Product Trading Ltd., a private Finnish-Turkish Joint Venture Corporation, Adana, Turkey

The use of trade or firm names in this publication is for reader information only and does not imply endorsement by Forestry Faculty, Istanbul University of any product or service.

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Kartal, S.N., Kose, C. Remediation of CCA-C treated wood using chelating agents. Holz Roh Werkst 61, 382–387 (2003). https://doi.org/10.1007/s00107-003-0412-7

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