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Extra resources for Wood Modification: Chemical, Thermal and Other Processes (Wiley Series in Renewable Resource)

Sample text

This treated wood will inevitably appear as waste in the future and strategies for disposal will have to be developed. At the present time, procedures are being developed to collect preservative-treated timber, incinerate the material, and recover the flue-stack emissions and ash to prevent dispersal into the environment. A significant concern with the use of incineration is the high volatility of arsenic (Dobbs and Grant, 1978). There have been suggestions that the recovered metals could be reused in preservative treatments, resulting in a cyclic flow of the metals used for wood preservation.

This treated wood will inevitably appear as waste in the future and strategies for disposal will have to be developed. At the present time, procedures are being developed to collect preservative-treated timber, incinerate the material, and recover the flue-stack emissions and ash to prevent dispersal into the environment. A significant concern with the use of incineration is the high volatility of arsenic (Dobbs and Grant, 1978). There have been suggestions that the recovered metals could be reused in preservative treatments, resulting in a cyclic flow of the metals used for wood preservation.

To be sure, the wood property has been improved and the wood can, in a sense, be considered to be modified. In addition, the property enhancement can be considered to occur for the lifetime of the product. However, although these changes have been made, the mode of action of the preservatives is due to the biocidal action of these substances on decay organisms. Such activity is often nonspecific, in that although the attack by the target organisms is prevented or retarded, the property may also be extended to nontarget organisms, such as mammals.

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