Bioremediation of CCA-treated wood by brown-rot fungi Fomitopsis palustris, Coniophora puteana, and Laetiporus sulphureus
Bioremediation of CCA-treated wood by brown-rot fungi Fomitopsis palustris, Coniophora puteana, and Laetiporus sulphureus
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DOI：
10.1007/s10086-003-0544-8
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发表时间：
2004-01-01
影响因子：
2.9
通讯作者：
Imamura, Y
中科院分区：
文献类型：
--
作者：
Kartal, SN;Munir, E;Imamura, Y
这项研究评估。3种褐腐真菌对铬化砷酸铜（CCA）处理木材的草酸积累及生物修复研究首先在发酵液中培养真菌以积累草酸。CCA处理过的木材进行生物修复，然后进行重金属与草酸浸出超过10天的发酵期。F. palustris和L. sulphureus与C. puteana。经过10天的发酵，草酸积累达到4.2克/升和3.2克/升，分别为这些真菌。沼泽层孔菌和L.硫脲氏菌暴露于CCA处理的木屑10天后，砷含量分别下降了100%和85%，而C. puteana补救去除只有18%的砷从CCA处理的木屑。同样，F. palustris和L. sulphureus修复过程中的生物量高于C. puteana。这是由于低草酸积累。这些结果表明，沼泽红毛藻和L.硫磺治理方法可以通过增加基质的酸度和增加金属的溶解度，经由草酸的产生来去除无机金属化合物。
This study evaluated. oxalic acid accumulation and bioremediation of chromated copper arsenate (CCA)treated wood by three brown-rot fungi Fomitopsis palustris, Coniophora puteana, and Laetiporus sulphureus. The fungi were first cultivated in a fermentation broth to accumulate oxalic acid. Bioremediation of CCA-treated wood was then carried out by leaching of heavy metals with oxalic acid over a 10-day fermentation period. Higher amounts of oxalic acid were produced by F. palustris and L. sulphureus compared with C. puteana. After 10-day fermentation, oxalic acid accumulation reached 4.2 g/l and 3.2 g/l for these fungi, respectively. Fomitopsis palustris and L. sulphureus exposed to CCA-treated sawdust for 10 days showed a decrease in arsenic of 100% and 85%, respectively; however, C. puteana remediation removed only 18% arsenic from CCA-treated sawdust. Likewise, chromium removal in F. palustris and L. sulphureus remediation processes was higher than those for C. puteana. This was attributed to low oxalic acid accumulation. These results suggest that F palustris and L. sulphureus remediation processes can remove inorganic metal compounds via oxalic acid production by increasing the acidity of the substrate and increasing the solubility of the metals.