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Release behavior of arsenic, chromium, and copper during heat treatments of CCA-treated wood
Journal of Material Cycles and Waste Management ( IF 2.7 ) Pub Date : 2021-05-19 , DOI: 10.1007/s10163-021-01246-z
Takahiro Kato , Takeshi Hatakeyama , Katsuyasu Sugawara

Biomass has been attracting attention as an environmentally friendly energy resource due to concerns about global environmental problems. Chromated copper arsenate-treated wood produced by injecting a solution containing sub-percent of chromium, copper, and arsenic (hereinafter referred to as CCA-treated wood) is one of the construction wastes. As fundamental research on the development of clean gasification process for biomass, pyrolysis (400–800 °C) which is the initial stage of gasification and CO2 gasification (1000 °C, 0–60 min) characteristics of CCA-treated wood were investigated. The release behavior of high-volatile arsenic during pyrolysis and gasification of CCA-treated wood was followed. When the CCA-treated wood was pyrolyzed, the release of arsenic proceeded with increasing temperature and the release extent was 41% at 800 °C. In the case of gasification, the release extent of arsenic increased with gasification time and 90% of the arsenic was released into gas phase within 60 min. Furthermore, it was possible to suppress the release of arsenic by 800 °C during pyrolysis by mixing organic sludge rich in iron and calcium with CCA-treated wood.



中文翻译:

CCA处理过的木材在热处理过程中砷,铬和铜的释放行为

由于对全球环境问题的关注,生物质作为一种环境友好型能源一直受到关注。通过注入含铬,铜和砷含量不足的溶液制成的经铬酸砷酸铜处理的木材(以下称为CCA处理的木材)是建筑废料之一。作为发展生物质清洁气化工艺的基础研究,热解(400–800°C)是气化和CO 2的初始阶段研究了CCA处理过的木材的气化(1000°C,0-60分钟)特性。遵循了高挥发性砷在CCA处理过的木材的热解和气化过程中的释放行为。将CCA处理过的木材热解后,砷的释放随温度的升高而进行,在800°C时的释放程度为41%。在气化的情况下,砷的释放程度随气化时间的增加而增加,并且90%的砷在60分钟内释放到气相中。此外,通过将富含铁和钙的有机污泥与CCA处理过的木材混合,可以在热解过程中在800°C抑制砷的释放。

更新日期:2021-05-19
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