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Effect of Reusing Extraction Liquids from Microwave Extracted Spent CCA-Treated Wood and its Anti-fungal Activities
Acid extraction microwave treatment is a fast and effective method to remove copper (Cu), chromium (Cr), and arsenic (As) from CCA-treated waste wood. The extraction liquids contain these removed metals, but the concentration is low due to the washing and dilution process. In this study, preHminary research was done to investigate the effect of reusable extraction liquids. 2.75% phosphoric acid and 0.75% acetic acid were prepared and mixed at 50:50 proportions. 1 g of CCA-treated waste wood powder was then mixed with 20 ml of acid in each reaction vessel. After treatment, the extraction liquids were reused for the next cycle, the lost volume was made up with previously unreacted acid. The liquids were used for 12 cycles. The concentration of Cu, Cr, and As in the liquids of each cycle were determined by ICP. The wood residue after each extraction cycle was digested and the metal concentration in the solution was also tested by ICP. The anti-fungal function of the extraction liquid was investigated by a white rot fungi (Trametes versicolor) and a brown rot fungi (Gloeophyllum trabeum in a Petris-dish based test.
Effect of Reusing Extraction Liquids from Microwave Extracted Spent CCA-Treated Wood and its Anti-fungal Activities
Acid extraction microwave treatment is a fast and effective method to remove copper (Cu), chromium (Cr), and arsenic (As) from CCA-treated waste wood. The extraction liquids contain these removed metals, but the concentration is low due to the washing and dilution process. In this study, preHminary research was done to investigate the effect of reusable extraction liquids. 2.75% phosphoric acid and 0.75% acetic acid were prepared and mixed at 50:50 proportions. 1 g of CCA-treated waste wood powder was then mixed with 20 ml of acid in each reaction vessel. After treatment, the extraction liquids were reused for the next cycle, the lost volume was made up with previously unreacted acid. The liquids were used for 12 cycles. The concentration of Cu, Cr, and As in the liquids of each cycle were determined by ICP. The wood residue after each extraction cycle was digested and the metal concentration in the solution was also tested by ICP. The anti-fungal function of the extraction liquid was investigated by a white rot fungi (Trametes versicolor) and a brown rot fungi (Gloeophyllum trabeum in a Petris-dish based test.
Effect of Reusing Extraction Liquids from Microwave Extracted Spent CCA-Treated Wood and its Anti-fungal Activities
Zhang, Xinan (author) / Shupe, Todd F. (author) / Hse, Chung Y. (author)
2013
7 Seiten, Bilder, Tabellen, 18 Quellen
Conference paper
English
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