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首页> 外文会议>11th Annual North American Waste to Energy Conference Apr 28-30, 2003 Tampa, Florida >Potential Concerns and Impacts of CCA-Treated Wood for the Waste-to-Energy Industry
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Potential Concerns and Impacts of CCA-Treated Wood for the Waste-to-Energy Industry

机译：CCA处理过的木材对废物能源行业的潜在关注和影响

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An issue that has received much attention in the U.S. in recent years, especially in Florida, is the impact of CCA-treated wood on human health and the environment (Decker et al. 2002; Gordon et al. 2002), including risks faced as a result of discarded CCA-treated wood in the solid waste stream (Townsend et al. 2001; Townsend et al. 2003). CCA-treated wood is preserved with copper, chromium and arsenic. All of the metals have toxic impacts at high exposures; it is arsenic however, which has raised the greatest concern (it is more hazardous at lower concentrations than the other CCA constituents). CCA-treated wood often becomes mixed with other wood from construction and demolition (C&D) debris (Tolaymat et al. 2000). Mixed C&D debris wood is either landfilled along with the rest of the C&D debris stream (e.g. concrete, gypsum drywall) or it is separated and processed for a variety of recycling markets. A major market for processed wood from C&D debris recycling operations is fuel in combustion facilities. As will be discussed later, the presence of CCA-treated wood in combustion systems can have several potential negative impacts. For a system designed and permitted to combust only clean wood debris, the CCA-treated wood should ideally be removed prior to combustion. However, the identification and segregation of CCA-treated wood from untreated wood can be a challenge. CCA-treated wood that has been separated from the rest of the waste stream must still be disposed of properly. At the current time, however, no commercially viable recycling markets for the material exist. Combustion in waste-to-energy (WTE) facilities or some type of designated combustion operation has been proposed by some as perhaps the best available solution for managing discarded CCA-treated wood. This paper explores issues and concerns surrounding CCA-treated wood as related to the WTE industry. Background information on the subject, including an update of the current regulatory status of CCA-treated wood, is reviewed. The magnitude of the CCA-treated wood waste stream, both now and in the future, is explored. Potential regulatory and environmental impacts on ash quality and air emissions are discussed. Since recycling options are very limited for CCA-treated wood at the present time and because of concerns from landfilling large volumes of this material, combustion facilities may play an important role in the future management of this waste stream.
机译：近年来，在美国，尤其是在佛罗里达州，引起人们广泛关注的一个问题是经过CCA处理的木材对人类健康和环境的影响（Decker等，2002； Gordon等，2002），包括面临的风险。固体废物流中丢弃的经过CCA处理的木材的结果（Townsend等，2001； Townsend等，2003）。经过CCA处理的木材用铜，铬和砷保存。所有金属在高暴露量下均会产生毒害。然而，砷是引起人们最大关注的问题（在较低浓度下，其危害性大于其他CCA成分）。经过CCA处理的木材通常会与建筑和拆除（C＆D）碎屑中的其他木材混合（Tolaymat等人，2000年）。混合的C＆D杂物木材与其他C＆D杂物流（例如混凝土，石膏干墙）一起被填埋，或者将其分离并处理以用于各种回收市场。来自C＆D碎片回收业务的加工木材的主要市场是燃烧设施中的燃料。正如后面将要讨论的，燃烧系统中经过CCA处理的木材的存在可能会产生一些潜在的负面影响。对于设计并仅允许燃烧干净的木屑的系统，理想的是在燃烧前将经过CCA处理的木料去除。但是，将CCA处理过的木材与未处理过的木材进行鉴别和隔离可能是一个挑战。与其余废物流分离的经过CCA处理的木材仍必须正确处置。但是，目前，尚无商业上可行的材料回收市场。一些人已经提出了将废物转化为能源（WTE）的设施或指定类型的燃烧操作中的燃烧方法，这可能是管理丢弃的CCA处理过的木材的最佳可用解决方案。本文探讨了与WTE行业相关的CCA处理过的木材的问题和关注。审查了有关该主题的背景信息，包括CCA处理过的木材当前监管状况的更新。现在和将来，经过CCA处理的木材废料流的量都得到了探索。讨论了对灰分质量和空气排放的潜在法规和环境影响。由于目前对于CCA处理过的木材，回收选择非常有限，并且由于需要掩埋大量这种材料，因此燃烧设施可能在未来处理此类废物流中发挥重要作用。

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