Bacterial Biodegradation of CCA-Treated Waste Wood
Bacterial Biodegradation of CCA-Treated Waste Wood
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经过 CCA 处理的废木材的细菌生物降解
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
C. Clausen
中科院分区：
文献类型：
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作者：
Flecia Cole;C. Clausen
随着用铬酸盐砷酸铜 (CCA) 处理的木材不再使用，我们需要消除木材中有毒金属的方法。评估了耐 CCA 细菌对经 CCA 处理的木材进行改性的能力。需氧细菌是从 20 年历史的经过 CCA 处理的木桩试验田中分离出来的。根据在含有 CCA 成分的营养琼脂上生长的能力而选择的细菌被鉴定为恶臭假单胞菌、地衣芽孢杆菌或凝结芽孢杆菌。使用扫描电子显微镜进行的 X 射线分析显示，一种或多种细菌分离株在细胞内从含有 0.12% CCA 的营养琼脂中摄取铜、铬或砷。对暴露于这些细菌中 3 周的锯末进行的原子吸收分析显示，与未暴露的锯末相比，铜的重量减少了 22% 至 46%，铬的重量减少了 0% 至 9%，砷的重量减少了 0% 至 8%。废弃木片的细菌暴露显示出作为改性 CCA 处理木材的有效手段的潜力，非常适合回收成木纤维复合材料等增值产品。
As wood treated with chromated copper arsenate (CCA) is removed from service, methods for eliminating toxic metals from the wood are needed. CCA-tolerant bacteria were evaluated for their ability to modify CCA-treated wood. Aerobic bacteria were isolated from a 20-year-old test plot of CCA-treated stakes. Bacteria selected for their ability to grow on nutrient agar containing CCA components, were identified as Pseudomonas putida, Bacillus licheniformis, or Bacillus coagulans. X-ray analysis using scanning electron microscopy revealed intracellular uptake of copper, chromium, or arsenic from nutrient agar containing 0.12 percent CCA by one or more bacterial isolates. Atomic absorption analysis of the sawdust exposed to these bacteria for 3 weeks showed a reduction of 22 percent to 46 percent for copper, 0 percent to 9 percent for chromium, and 0 percent to 8 percent for arsenic by weight compared with the unexposed sawdust. Bacterial exposure of waste wood chips shows potential as an effective means of modifying CCA-treated wood, ideally for recycling into value-added products, such as wood fiber composites.