Coşkun Köse

Remediation of CCA-C treated wood using chelating agents

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.ZusammenfassungDer 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.

Adsorption of Copper, Chromium, and Arsenic from Chromated Copper Arsenate (CCA) Treated Wood onto Various Adsorbents

Substantial progress has been made in remediation of preservative treated waste wood by chemical extraction with several mineral and organic acids and biodegradation using bacteria and fungi in recent years. Non-conventional low-cost adsorbents are used to bind the metal ions in extremely stable complexes in heavy metal contaminated soils or polluted waters and thus to remediate such substrates. In this study, various adsorbents from industrial and agricultural processes were evaluated in removal of copper, chromium, and arsenic from chromated copper arsenate (CCA)- treated wood by using batch extracting experiments. Most adsorbents used in the study had the potential to remove copper ele- ment from CCA-treated wood, while chromium was the most resistant element against removal in most cases. In general, as amount of adsorbents in the extraction process and extraction duration increased, the percentage of elements removed increased. The adsorbents used in the study could be important in the remediation of wood treated with organic or water- borne wood preservatives containing copper since the use of the adsorbents is one key to unfix copper from treated wood treated.

What Women Know that Men Do Not about Chestnut Trees in Turkey: A Method of Hearing Muted Knowledge

Abstract. Decades of ethnobotanical observations have shown that knowledge varies significantly according to the identity attributes of participants, such as their religion, occupation, status, income level, geographic origin, and gender. Ethnobiology shares the imperative of all social science disciplines in tailoring gender-responsive methodologies and operating epistemologies. Particularly, researcher identity, performance, and preference for kinds of knowledge may have significant consequences. Here, we present a study centered around an extra effort to engage womens knowledge of sweet chestnut (Castanea sativa) in Turkey. In Turkeys Black Sea, Marmara, and Aegean regions, we conducted 142 extended ethnobotanical interviews with chestnut-utilizing participants using three distinct protocols: gender-unaddressed, men-only, and women-only. Based on participant contributions, we developed and analyzed a dataset which accounted for total reported uses, chestnut material typologies, direct and indirect plant traits, as well as unique and cultural reports. We compared the findings from these distinct protocols using Correspondence Analysis and two-way Analysis of Variance. Our results show that the knowledge reported by women-only was significantly more diverse than knowledge reported under men-only and gender-unaddressed protocols. This significant difference was most readily attributed to the higher frequency of unique and cultural knowledge shared during women-only interviews. Also, considering the routinely mixed-gender conditions under the gender-unaddressed protocol, our findings suggest that male presence, in any form, can mute, or render inadmissible, womens ethnobotanical testimony. These findings challenge the community consensus model of ethnobotanical knowledge and field methodologies that do not account for in-field gender dynamics. In conclusion, we articulate a way to amplify insights from intersectionality theory using ethnobotanical approaches.

Evaluation of decay oxalic acid production and strength loss in wood by the dry rot fungus, Serpula lacrymans

Evaluation of decay oxalic acid production and strength loss in wood by the dry rot fungus, Serpula lacrymans