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Ari Väisänen - One of the best experts on this subject based on the ideXlab platform.

  • An uptake and elimination kinetics approach to assess the bioavailability of chromium, Copper, and arsenic to earthworms (Eisenia andrei) in contaminated field soils
    Environmental Science and Pollution Research, 2019
    Co-Authors: Johanna Kilpi-koski, Olli-pekka Penttinen, Ari Väisänen
    Abstract:

    The aim of this study was to determine the bioavailability of metals in field soils contaminated with Chromated Copper Arsenate (CCA) mixtures. The uptake and elimination kinetics of chromium, Copper, and arsenic were assessed in the earthworm Eisenia andrei exposed to soils from a gradient of CCA wood preservative contamination near Hartola, Finland. In soils contaminated with 1480–1590 mg Cr/kg dry soil, 642–791 mg Cu/kg dry soil, and 850–2810 mg Ag/kg dry soil, uptake and elimination kinetics patterns were similar for Cr and Cu. Both metals were rapidly taken up and rapidly excreted by Eisenia andrei with equilibrium reached within 1 day. The metalloid As, however, showed very slow uptake and elimination in the earthworms and body concentrations did not reach equilibrium within 21 days. Bioaccumulation factors (BAF) were low for Cu and Cr (

  • an uptake and elimination kinetics approach to assess the bioavailability of chromium Copper and arsenic to earthworms eisenia andrei in contaminated field soils
    Environmental Science and Pollution Research, 2019
    Co-Authors: Johanna Kilpikoski, Olli-pekka Penttinen, Ari Väisänen
    Abstract:

    The aim of this study was to determine the bioavailability of metals in field soils contaminated with Chromated Copper Arsenate (CCA) mixtures. The uptake and elimination kinetics of chromium, Copper, and arsenic were assessed in the earthworm Eisenia andrei exposed to soils from a gradient of CCA wood preservative contamination near Hartola, Finland. In soils contaminated with 1480–1590 mg Cr/kg dry soil, 642–791 mg Cu/kg dry soil, and 850–2810 mg Ag/kg dry soil, uptake and elimination kinetics patterns were similar for Cr and Cu. Both metals were rapidly taken up and rapidly excreted by Eisenia andrei with equilibrium reached within 1 day. The metalloid As, however, showed very slow uptake and elimination in the earthworms and body concentrations did not reach equilibrium within 21 days. Bioaccumulation factors (BAF) were low for Cu and Cr (< 0.1), but high for As at 0.54–1.8. The potential risk of CCA exposure for the terrestrial ecosystem therefore is mainly due to As.

Lieve Helsen - One of the best experts on this subject based on the ideXlab platform.

  • REVIEW OF THERMOCHEMICAL CONVERSION PROCESSES AS DISPOSAL TECHNOLOGIES FOR Chromated Copper Arsenate (CCA) TREATED WOOD WASTE
    2015
    Co-Authors: Lieve Helsen, Eric Van Den Bulck
    Abstract:

    Several alternative methods for the disposal of Chromated Copper Arsenate (CCA) treated wood waste have been studied in the literature, and these methods are reviewed and compared in this paper. Extraction experiments have been carried out on CCA treated wood and evaluated as a method to recover the metal compounds into either fresh wood preservatives or other useful industrial materials. Recycling and recovery processes of the metals in the metallurgical industry have also been studied, but not yet all metal products are transformed to usable forms. A study about biorecycling of CCA treated wood through bioremediation and biodeterioration has been initiated. Numerous studies and experiments have been carried out on burning contaminated wood. Direct electrodialytic removal of the metals from CCA treated wood, as well as electrochemical cleaning processes for ash resulting from combustion of CCA treated wood, are under study. Pyrolysis processes (both slow and flash pyrolysis) have been investigated as a major process for the disposal of cellulosic wastes, also CCA treated wood waste. The authors performed a lot of experimental and theoretical work to get more insight in the metal behaviour during the low-temperature pyrolysis of CCA treated wood waste. Experiments wer

  • review of disposal technologies for Chromated Copper Arsenate cca treated wood waste with detailed analyses of thermochemical conversion processes
    Environmental Pollution, 2005
    Co-Authors: Lieve Helsen, Eric Van Den Bulck
    Abstract:

    Several alternative methods for the disposal of Chromated Copper Arsenate (CCA) treated wood waste have been studied in the literature, and these methods are reviewed and compared in this paper. Alternative disposal methods include: recycling and recovery, chemical extraction, bioremediation, electrodialytic remediation and thermal destruction. Thermochemical conversion processes are evaluated in detail based on experiments with model compounds as well as experimental and modelling work with CCA treated wood. The latter category includes: determination of the percentage of arsenic volatilised during thermal conversion of CCA treated wood, identification of the mechanisms responsible for arsenic release, modelling of high temperature equilibrium chemistry involved when CCA treated wood is burned, overview of options available for arsenic capture, characterisation of ash resulting from (co-)combustion of CCA treated wood, concerns about polychlorinated dibenzo-p-dioxins/furans (PCDD/F) formation. Finally, the most appropriate thermochemical disposal technology is identified on short term (co-incineration) and on long term (low-temperature pyrolysis or high-temperature gasification).

  • determination and characterisation of Copper chromium and arsenic in Chromated Copper Arsenate cca treated wood and its pyrolysis residues by inductively coupled plasma mass spectrometry
    Analyst, 1997
    Co-Authors: Kristel Van Den Broeck, Lieve Helsen, Carlo Vandecasteele, Eric Van Den Bulck
    Abstract:

    To dispose of Chromated Copper Arsenate (CCA) treated wood waste, pyrolysis is a valuable method. In the context of a study aimed at optimising the pyrolysis of CCA treated wood, a method for the determination and characterisation of Cr, Cu and As in wood and its pyrolysis residues was developed. Leaching and dissolution procedures were applied and compared to determine the total amount of Cr, Cu and As in the dried wood and in the pyrolysis residue. A sequential extraction procedure was also applied to the pyrolysis residue and confirmed that As is bound to oxidised compounds, carbonates and the organic matrix. Copper showed a similar behaviour to As in the leaching environments considered, whereas Cr behaved in a totally different way. ICP-MS was used to determine Cu, Cr and As. Special attention was given to the analysis of the organic matrices resulting from the sequential extraction procedure. To determine the oxidation state of As in the different extraction steps, hydride generation coupled to ICP-MS was used. It could be seen clearly that AsIII is far more mobile than AsV and that the AsV compounds, originally present in the CCA solution and CCA treated wood, are partly reduced to AsIII compounds.

Olli-pekka Penttinen - One of the best experts on this subject based on the ideXlab platform.

  • An uptake and elimination kinetics approach to assess the bioavailability of chromium, Copper, and arsenic to earthworms (Eisenia andrei) in contaminated field soils
    Environmental Science and Pollution Research, 2019
    Co-Authors: Johanna Kilpi-koski, Olli-pekka Penttinen, Ari Väisänen
    Abstract:

    The aim of this study was to determine the bioavailability of metals in field soils contaminated with Chromated Copper Arsenate (CCA) mixtures. The uptake and elimination kinetics of chromium, Copper, and arsenic were assessed in the earthworm Eisenia andrei exposed to soils from a gradient of CCA wood preservative contamination near Hartola, Finland. In soils contaminated with 1480–1590 mg Cr/kg dry soil, 642–791 mg Cu/kg dry soil, and 850–2810 mg Ag/kg dry soil, uptake and elimination kinetics patterns were similar for Cr and Cu. Both metals were rapidly taken up and rapidly excreted by Eisenia andrei with equilibrium reached within 1 day. The metalloid As, however, showed very slow uptake and elimination in the earthworms and body concentrations did not reach equilibrium within 21 days. Bioaccumulation factors (BAF) were low for Cu and Cr (

  • an uptake and elimination kinetics approach to assess the bioavailability of chromium Copper and arsenic to earthworms eisenia andrei in contaminated field soils
    Environmental Science and Pollution Research, 2019
    Co-Authors: Johanna Kilpikoski, Olli-pekka Penttinen, Ari Väisänen
    Abstract:

    The aim of this study was to determine the bioavailability of metals in field soils contaminated with Chromated Copper Arsenate (CCA) mixtures. The uptake and elimination kinetics of chromium, Copper, and arsenic were assessed in the earthworm Eisenia andrei exposed to soils from a gradient of CCA wood preservative contamination near Hartola, Finland. In soils contaminated with 1480–1590 mg Cr/kg dry soil, 642–791 mg Cu/kg dry soil, and 850–2810 mg Ag/kg dry soil, uptake and elimination kinetics patterns were similar for Cr and Cu. Both metals were rapidly taken up and rapidly excreted by Eisenia andrei with equilibrium reached within 1 day. The metalloid As, however, showed very slow uptake and elimination in the earthworms and body concentrations did not reach equilibrium within 21 days. Bioaccumulation factors (BAF) were low for Cu and Cr (< 0.1), but high for As at 0.54–1.8. The potential risk of CCA exposure for the terrestrial ecosystem therefore is mainly due to As.

Eric Van Den Bulck - One of the best experts on this subject based on the ideXlab platform.

  • review of disposal technologies for Chromated Copper Arsenate cca treated wood waste with detailed analyses of thermochemical conversion processes
    Environmental Pollution, 2005
    Co-Authors: Lieve Helsen, Eric Van Den Bulck
    Abstract:

    Several alternative methods for the disposal of Chromated Copper Arsenate (CCA) treated wood waste have been studied in the literature, and these methods are reviewed and compared in this paper. Alternative disposal methods include: recycling and recovery, chemical extraction, bioremediation, electrodialytic remediation and thermal destruction. Thermochemical conversion processes are evaluated in detail based on experiments with model compounds as well as experimental and modelling work with CCA treated wood. The latter category includes: determination of the percentage of arsenic volatilised during thermal conversion of CCA treated wood, identification of the mechanisms responsible for arsenic release, modelling of high temperature equilibrium chemistry involved when CCA treated wood is burned, overview of options available for arsenic capture, characterisation of ash resulting from (co-)combustion of CCA treated wood, concerns about polychlorinated dibenzo-p-dioxins/furans (PCDD/F) formation. Finally, the most appropriate thermochemical disposal technology is identified on short term (co-incineration) and on long term (low-temperature pyrolysis or high-temperature gasification).

Eric Van Den Bulck - One of the best experts on this subject based on the ideXlab platform.

  • REVIEW OF THERMOCHEMICAL CONVERSION PROCESSES AS DISPOSAL TECHNOLOGIES FOR Chromated Copper Arsenate (CCA) TREATED WOOD WASTE
    2015
    Co-Authors: Lieve Helsen, Eric Van Den Bulck
    Abstract:

    Several alternative methods for the disposal of Chromated Copper Arsenate (CCA) treated wood waste have been studied in the literature, and these methods are reviewed and compared in this paper. Extraction experiments have been carried out on CCA treated wood and evaluated as a method to recover the metal compounds into either fresh wood preservatives or other useful industrial materials. Recycling and recovery processes of the metals in the metallurgical industry have also been studied, but not yet all metal products are transformed to usable forms. A study about biorecycling of CCA treated wood through bioremediation and biodeterioration has been initiated. Numerous studies and experiments have been carried out on burning contaminated wood. Direct electrodialytic removal of the metals from CCA treated wood, as well as electrochemical cleaning processes for ash resulting from combustion of CCA treated wood, are under study. Pyrolysis processes (both slow and flash pyrolysis) have been investigated as a major process for the disposal of cellulosic wastes, also CCA treated wood waste. The authors performed a lot of experimental and theoretical work to get more insight in the metal behaviour during the low-temperature pyrolysis of CCA treated wood waste. Experiments wer

  • determination and characterisation of Copper chromium and arsenic in Chromated Copper Arsenate cca treated wood and its pyrolysis residues by inductively coupled plasma mass spectrometry
    Analyst, 1997
    Co-Authors: Kristel Van Den Broeck, Lieve Helsen, Carlo Vandecasteele, Eric Van Den Bulck
    Abstract:

    To dispose of Chromated Copper Arsenate (CCA) treated wood waste, pyrolysis is a valuable method. In the context of a study aimed at optimising the pyrolysis of CCA treated wood, a method for the determination and characterisation of Cr, Cu and As in wood and its pyrolysis residues was developed. Leaching and dissolution procedures were applied and compared to determine the total amount of Cr, Cu and As in the dried wood and in the pyrolysis residue. A sequential extraction procedure was also applied to the pyrolysis residue and confirmed that As is bound to oxidised compounds, carbonates and the organic matrix. Copper showed a similar behaviour to As in the leaching environments considered, whereas Cr behaved in a totally different way. ICP-MS was used to determine Cu, Cr and As. Special attention was given to the analysis of the organic matrices resulting from the sequential extraction procedure. To determine the oxidation state of As in the different extraction steps, hydride generation coupled to ICP-MS was used. It could be seen clearly that AsIII is far more mobile than AsV and that the AsV compounds, originally present in the CCA solution and CCA treated wood, are partly reduced to AsIII compounds.