Metal Retention in the Solid Residue after Low-Temperature Pyrolysis of Chromated Copper Arsenate (CCA)-Treated Wood
Abstract
Based on previous research work, it is expected that dry recuperation of the metals in chromated copper arsenate (CCA)-treated wood waste can be achieved by low-temperature pyrolysis if a combination of pyrolysis temperature and residence time can be found, for which the two requirements: (1) zero-emission of metals, and (2) metal agglomeration are satisfied. To determine the working conditions for zero metal release, pyrolysis experiments with precisely controlled temperature and residence time and accurately known input metal concentrations of the CCA-treated wood samples, were conducted. Temperatures lower than 327°C are considered, since the release of arsenic is thought to be controlled by the reduction reaction of As2O5 to As2O3, which occurs sharply at 327°C. Metal retentions are calculated based on the measured metal concentrations in the pyrolysis residue and in the dried CCA-treated wood. The results suggest that pyrolysis at 300°C for 20 min gives rise to zero release for the three metals (Cr, Cu, and As), while pyrolysis at 320°C leads to nonnegligible metal releases. Thus, the experimental results suggest that the decomposition temperature of As2O5 is lower than 320°C. However, due to the high experimental uncertainty the observations are inconclusive. For future industrial applications, this study already shows that very careful control of process parameters will be required to ensure a zero arsenic emission. Moreover, this study indicates that an arsenic sampli…
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As(V) is reduced to arsenic trioxide (As2O3), decomposes, and becomes volatile during pyrolysis, even at 200 °C.
“These findings are in good agreement with other studies that reported that As (V) is reduced to arsenic trioxide (As 2 O 3 ), decomposes, and becomes volatile during pyrolysis, even at 200 • C [29,30].”
From Pyrolysis of Chromated Copper Arsenate-Treated Wood: Investigation of Temperature, Granulometry, Biochar Yield, and Metal Pathways (2022) · cites this paper as [29]
The interaction of arsenate with glucose might result in acceleration of the decomposition reaction, oxidation-reduction reactions, and formation and decomposition of arsenate esters.
“It might result in the acceleration of the decomposition reaction, oxidation-reduction reactions, and the formation and decomposition of arsenate esters [29].”
From Pyrolysis of Chromated Copper Arsenate-Treated Wood: Investigation of Temperature, Granulometry, Biochar Yield, and Metal Pathways (2022) · cites this paper as [29]
Heating chromium and arsenic oxides volatilizes free arsenic oxide, some of which reacts with Cr2O3 to form chromium arsenate (CrAsO4).
“Similarly, heating chromium and arsenic oxides volatilize free arsenic oxide, some of which reacts with Cr 2 O 3 to form chromium arsenate (CrAsO 4 ).”
From Pyrolysis of Chromated Copper Arsenate-Treated Wood: Investigation of Temperature, Granulometry, Biochar Yield, and Metal Pathways (2022) · cites this paper as [29]
Heating copper and arsenic oxides volatilizes part of the arsenic oxide, and the remaining part reacts with copper oxide to form mixed copper arsenates (2CuO.As2O5 and Cu3(AsO4)2).
“Heating copper and arsenic oxides volatilize part of the arsenic oxide, and the remaining part reacts with copper oxide to form mixed copper arsenates (2 CuO.As 2 O 5 and Cu 3 (AsO 4 ) 2 ).”
From Pyrolysis of Chromated Copper Arsenate-Treated Wood: Investigation of Temperature, Granulometry, Biochar Yield, and Metal Pathways (2022) · cites this paper as [29]
This reduction reaction occurs at about 327°C.
“This reaction occurs at about 327 • C.”
From Pyrolysis of Chromated Copper Arsenate-Treated Wood: Investigation of Temperature, Granulometry, Biochar Yield, and Metal Pathways (2022) · cites this paper as [29]
The thermal decomposition of the inorganic components of CCA-treated wood can be influenced by their interaction with the decomposition products of wood.
“The thermal decomposition of the inorganic components of CAA-treated wood can be influenced by their interaction with the decomposition products of wood.”
From Pyrolysis of Chromated Copper Arsenate-Treated Wood: Investigation of Temperature, Granulometry, Biochar Yield, and Metal Pathways (2022) · cites this paper as [29]
The decomposition of arsenate is highly influenced by the presence of glucose.
“For instance, the decomposition of arsenate is highly influenced by the presence of glucose.”
From Pyrolysis of Chromated Copper Arsenate-Treated Wood: Investigation of Temperature, Granulometry, Biochar Yield, and Metal Pathways (2022) · cites this paper as [29]
As release during wood pyrolysis is governed by a reduction reaction of arsenate (As2O5) to arsenite (As2O3).
“The As release during wood pyrolysis is governed by a reduction reaction of arsenate (As 2 O 5 ) to arsenite (As 2 O 3 ).”
From Pyrolysis of Chromated Copper Arsenate-Treated Wood: Investigation of Temperature, Granulometry, Biochar Yield, and Metal Pathways (2022) · cites this paper as [29]
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Self-citation
- Authors
- Helsen, L., & van den Bulck, E.
- Affiliations
- KU Leuven (BE)
- ORCID
- Helsen, Lieve
- Venue
- Environmental Engineering Science
- Publisher
- SAGE Publications
- Published
- 2003-11
- Volume
- 20
- Issue
- 6
- Pages
- 569-580
- ISSN
- 1092-8758 (ISSN-L)
- 1557-9018
- OpenAlex
- W2122635719
- Cited by
- 24
- References
- 25
- Citations by year
- 2022: 2 · 2021: 1 · 2019: 1 · 2018: 1 · 2015: 3 · 2013: 3 · 2012: 1
- FWCI
- 7.25
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Environmental Engineering Science (publishedVersion)
- Lirias (submittedVersion)
- Funders
- Fonds Wetenschappelijk Onderzoek
- Vlaamse regering
- Topics
- Physical Sciences › Environmental Science › Waste Management and Disposal › Recycling and Waste Management Techniques
- Physical Sciences › Engineering › Biomedical Engineering › Thermochemical Biomass Conversion Processes
- Physical Sciences › Engineering › Building and Construction › Recycling and utilization of industrial and municipal waste in materials production
- Keywords
- chromated copper arsenate, CCA-treated wood, low-temperature pyrolysis, metal retention, arsenic emissions, arsenate reduction, chromium, copper, wood waste, pyrolysis temperature, residence time, solid residue
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