CCA removal from treated wood using a dual remediation process
CCA removal from treated wood using a dual remediation process
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使用双重修复工艺从处理过的木材中去除 CCA
DOI：
10.1177/0734242x0001800510
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发表时间：
2000
影响因子：
3.9
通讯作者：
C. Clausen
中科院分区：
文献类型：
--
作者：
C. Clausen
需要新的方法来修复铬化砷酸铜（CCA）处理的废木材，以转移这种材料从垃圾填埋场。在本研究中，采用两步修复工艺处理cca处理的木材薄片，去除铜、铬和砷。工艺条件，包括酸提取和细菌培养与耐金属细菌，进行了优化。结果表明，暴露于1.0%草酸18小时是本研究中使用的木材尺寸的最佳暴露时间。然后改变草酸浓度以确定去除金属的最佳浓度。草酸浓度的增加去除了越来越多的铜、铬和砷。在0.80%的酸萃取和细菌暴露下，铜、铬和砷的总量分别减少了78%、97%和93%。草酸浓度为0.8%，然后用地衣芽孢杆菌CC01进行细菌培养，可以最大限度地去除处理过的木材中的铜、铬和砷，同时木材纤维在酸条件下暴露最少。
Novel approaches to remediate chromated-copper-arsenate (CCA)-treated waste wood are needed to divert this material from landfills. In this study, CCA-treated wood wafers were treated with a two-step remediation process to remove copper, chromium and arsenic. Process conditions, involving an acid extraction and bacterial culture with a metal-tolerant bacterium, were optimized. It was determined that 18 h of exposure to 1.0% oxalic acid was an optimal exposure time for the size of wood used in this study. Oxalic acid concentration was then varied to determine optimal concentration for metal removal. Increasing concentrations of oxalic acid removed increasing quantities of copper, chromium and arsenic. Acid extraction at 0.80% and bacterium exposure resulted in a total reduction of 78% copper, 97% chromium and 93% arsenic. An 0.8% of oxalic acid followed by bacterial culture with Bacillus licheniformis CC01 afforded the best conditions for maximum removal of copper, chromium, and arsenic from treated wood with minimal exposure of the wood fiber to acid conditions.