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首页> 外文会议>Progress in environmental science and technology.;vol. 3. >Remediation of Out-of-Service CCA-Treated Utility Poles Using Ozone and Peroxyacetic Acid
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Remediation of Out-of-Service CCA-Treated Utility Poles Using Ozone and Peroxyacetic Acid

机译：使用臭氧和过氧乙酸对CCA处理过的停工的公用事业设施进行修复

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Chromated copper arsenate (CCA) has been one of the most widely used since the 1933's as a wood preservative to protect wood against decay and insects for exterior applications such as decks, housing, utility poles, play equipment and fences. Although its major use for consumer lumber products was replaced with chromium-and arsenic-free preservatives in the USA, Canada and European Countries by the end of 2003, large volumes of CCA-treated wood has been still coming out-of-service each year. Therefore, at present, the potential diffusion of heavy metals from CCA-treated wood waste after disposal has become an important problem. The aim of this study was to investigate the ozone and peroxyacetic acid as potential alternatives and their effectiveness in terms of removal of Cu, Cr and As from CCA treated wood sawdust. Extraction experiments were designed to determine optimum extraction conditions using aqueous peroxyacetic acid which was prepared by mixing 50-50% (v/v) of 30% H2O2 and 100% acetic acid. Experiments were carried out in 50 mL screw-capped test tubes at room temperature, 3 different concentrations (100%, 50% and 25%), and for 5 reaction time intervals (0.5 h, 1 h, 2 h, 6 h, and 24 h). For each series, two replicate samples were evaluated using 3 g wood sawdust and a mass ratio of liquid extractant to solid wood of 10-1. An additional series of extractions were done using ozone. CCA-treated wood sawdust samples were exposed to ozone at room temperature for 2 reaction time intervals (15 and 30 min) using Enaly 20K-4U (20g/hr) Ozone Generator. The results showed that both peroxyacetic acid and ozone were very effective to remove Cu, Cr and As from CCA-treated sawdust. It was found that about 96% Cu, 98% Cr and 98% As were extracted when wood sawdust samples were remediated with 25% of peroxyacetic acid while 96% Cu, 94% Cr and 92% As when wood samples were remediated with ozone. The results showed that concentrations of peroxyacetic acid did not affect the remediation efficiency while reaction time intervals significantly enhance the remediation efficiency up to 6 hours.
机译：铬酸砷酸铜（CCA）自1933年代以来一直是最广泛使用的木材防腐剂之一，用于保护木材免于腐烂和驱虫，可用于甲板，房屋，电线杆，游乐设备和围栏等外部应用。尽管到2003年底，其在消费木材产品中的主要用途已在美国，加拿大和欧洲国家被无铬和无砷的防腐剂取代，但每年仍大量停用经CCA处理的木材。因此，目前，重金属在处理后从CCA处理过的木材废料中的潜在扩散已成为一个重要问题。这项研究的目的是研究臭氧和过氧乙酸作为潜在的替代品及其在从CCA处理过的木屑中去除Cu，Cr和As方面的有效性。设计萃取实验以确定使用过氧乙酸水溶液的最佳萃取条件，该过氧乙酸水溶液是通过混合50-50％（v / v）的30％H2O2和100％乙酸制备的。实验是在50 mL螺旋盖试管中于室温，3种不同浓度（100％，50％和25％）的条件下进行的，反应间隔为5小时（0.5 h，1 h，2 h，6 h和5 h）。 24小时）。对于每个系列，使用3 g的木屑和液体萃取剂与实木的质量比为10-1来评估两个重复样品。使用臭氧进行了另一系列的提取。使用Enaly 20K-4U（20g / hr）臭氧发生器，将CCA处理过的木屑样品在室温下暴露于臭氧中2个反应时间间隔（15和30分钟）。结果表明，过氧乙酸和臭氧均能有效去除CCA处理过的木屑中的Cu，Cr和As。已经发现，当用25％的过氧乙酸对木屑样品进行补救时，提取了约96％的Cu，98％的Cr和98％的As，而当用臭氧对木材样品进行了修复时，提取了96％的Cu，94％的Cr和92％的As。结果表明，过氧乙酸的浓度不影响修复效率，而反应时间间隔可显着提高长达6小时的修复效率。

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