Sierra-Alvarez Reyes
Department of Chemical and Environmental Engineering, University of Arizona, Tucson, AZ 85721-0011, USA.
Waste Manag. 2009 Jun;29(6):1885-91. doi: 10.1016/j.wasman.2008.12.015. Epub 2009 Jan 10.
Large volumes of preservative-treated wood containing toxic Cr, Cu and As salts are decommissioned worldwide. This study investigated the effectiveness of solid-state fermentation with copper-tolerant brown-rot fungi for the remediation of wood treated with chromated copper arsenate (CCA) and acid copper chromate (ACC) formulations. Treatment of CCA- and ACC-wood with the most effective strain, Antrodia vaillantii FRLP-14G, attained extensive leaching of As and/or Cr, but Cu elimination was poor (<18%). Additional research showed that a variety of organic acids, including citrate, are effective Cu extractants. Based on these findings, a process combining chemical extraction and subsequent fungal treatment was developed that proved highly effective in removing inorganic pollutants from CCA-wood. Extraction of CCA-wood with citric acid (30 mM, pH 3.10) followed by a 28-day solid-state fermentation period removed 87% Cu, 80% Cr, and 100% As. These results indicate the potential of the two-stage process for the remediation of preservative-treated wood.
全球范围内，大量含有有毒铬、铜和砷盐的防腐处理木材被退役。本研究调查了利用耐铜褐腐真菌进行固态发酵修复经铬酸铜砷（CCA）和酸性铬酸铜（ACC）配方处理木材的有效性。用最有效的菌株瓦氏革裥菌FRLP - 14G处理CCA木材和ACC木材，可实现砷和/或铬的大量浸出，但铜的去除效果较差（<18%）。进一步研究表明，包括柠檬酸盐在内的多种有机酸是有效的铜萃取剂。基于这些发现，开发了一种化学萃取与后续真菌处理相结合的工艺，该工艺在从CCA木材中去除无机污染物方面被证明非常有效。用柠檬酸（30 mM，pH 3.10）萃取CCA木材，随后进行28天的固态发酵，可去除87%的铜、80%的铬和100%的砷。这些结果表明了该两阶段工艺在修复防腐处理木材方面的潜力。
