Application of a CCA-treated wood waste decontamination process to other copper-based preservative-treated wood after disposal.
Application of a CCA-treated wood waste decontamination process to other copper-based preservative-treated wood after disposal.
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DOI：
10.1016/j.jhazmat.2010.12.094
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发表时间：
2011-02
影响因子：
13.6
通讯作者：
A. Janin;L. Coudert;P. Riché;G. Mercier;P. Cooper;J. Blais
中科院分区：
文献类型：
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作者：
A. Janin;L. Coudert;P. Riché;G. Mercier;P. Cooper;J. Blais
直到2004年，铬化砷酸铜（CCA）处理木材被广泛用于住宅和工业应用。自2004年以来，由于健康问题，CCA被替代铜防腐剂如碱性季铜（ACQ）、铜唑（CA）和微粉季铜（MCQ）所取代，用于住宅应用。处理过的木材废料处理正在成为一个问题。先前的研究确定了一种基于硫酸浸出的化学方法来净化cca处理的木材废料。研究了该工艺在铜基防腐剂（碱性季铜（ACQ）、唑铜（CA）和微细季铜（MCQ））处理木材中的潜在应用。在75°C下，用0.1M硫酸连续浸出2小时，对所有类型的处理木材都成功，铜的溶解率超过98%。采用氯化铁混凝、氢氧化钠沉淀（pH=7）处理不同酸性渗滤液。在2A电流下电沉积90min后，渗滤液中铜的回收率可达94% ~ 99%。因此，以前为cca处理的木材废料去污开发的工艺可以有效地应用于CA-， ACQ-或mcq -处理的木材。
Chromated copper arsenate (CCA)-treated wood was widely used until 2004 for residential and industrial applications. Since 2004, CCA was replaced by alternative copper preservatives such as alkaline copper quaternary (ACQ), copper azole (CA) and micronized copper quaternary (MCQ), for residential applications due to health concerns. Treated wood waste disposal is becoming an issue. Previous studies identified a chemical process for decontaminating CCA-treated wood waste based on sulfuric acid leaching. The potential application of this process to wood treated with the copper-based preservatives (alkaline copper quaternary (ACQ), copper azole (CA) and micronized copper quaternary (MCQ)) is investigated here. Three consecutive leaching steps with 0.1M sulfuric acid at 75°C for 2h were successful for all the types of treated wood and achieved more than 98% copper solubilisation. The different acidic leachates produced were successively treated by coagulation using ferric chloride and precipitation (pH=7) using sodium hydroxide. Between 94 and 99% of copper in leachates could be recovered by electrodeposition after 90min using 2A electrical current. Thus, the process previously developed for CCA-treated wood waste decontamination could be efficiently applied for CA-, ACQ- or MCQ-treated wood.