Fungal biodegradation of CCA-treated wood and removal of its metal components |
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Authors: | Choi Yong-Seok Kim Jae-Jin Kim Min-Ji Imamura Yuji Yoshimura Tsuyoshi Kim Gyu-Hyeok |
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Institution: | a Division of Environmental Science & Ecological Engineering, College of Life Sciences & Biotechnology, Korea University, 5-1 Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea b Research Institute for Sustainable Humanosphere (RISH), Kyoto University, Uji, Kyoto 611-2011, Japan |
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Abstract: | In the present study, 5 isolates of brown-rot fungi were used for fungal bioprocessing (FB) of chromated copper arsenate (CCA)-treated wood wastes: Antrodia vaillantii SEL8501, Fomitopsis palustris TYP0507 and TYP6137, and Crustoderma sp. KUC8065 and KUC8611. The isolates showed notable capacity for the degradation of treated wood and removal of CCA components via the American Wood Protection Association soil block test. Among them, Crustoderma sp. KUC8611 effectively decayed the treated wood, causing a mass loss of up to 60%. F. palustris caused extensive leaching of CrO3 of up to 79% and As2O5 of up to 87%, but only moderate leaching of CuO of up to 50%. This high capacity for removal of CrO3 and As2O5 showed a strong logarithmic relationship with the amount of oxalic acid produced in the decayed wood. The majority of metals removed from treated wood during the decay process were deposited in the soil and feeder strip. Further investigation will be required to establish the capability of selected fungi for FB of full-sized lumber treated with CCA. |
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Keywords: | Fungal bioprocessing Biodegradation Metal removal Brown-rot fungi CCA-treated wood wastes |
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