Estimation of the biodegradation rate of 2,3,7,8-tetrachlorodibenzo-p-dioxin by using dioxin-degrading fungus, Pseudallescheria boydii |
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Authors: | Ishii Kazuei Furuichi Toru Tanikawa Noboru Kuboshima Masaru |
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Affiliation: | Graduate School of Engineering, Hokkaido University, Japan. k-ishii@eng.hokudai.ac.jp |
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Abstract: | We are developing a bioreactor system for treating dioxin-contaminated soil or water using the dioxin-degrading fungus, Pseudallescheria boydii (P. boydii). In order to design the bioreactor system, this study estimated the rate at which P. boydii degraded 2,3,7,8-tetrachlorodibenzo-p-dioxin (2,3,7,8-TCDD), which is the most toxic of the dioxins. The experimental results showed that P. boydii degraded 2,3,7,8-TCDD during its logarithmic growth phase, using glucose as a carbon source for growth, and that the growth of P. boydii was not affected by 2,3,7,8-TCDD concentrations usually found at contaminated sites. These results were then used to apply successfully an existing mathematical model to the degradation of 2,3,7,8-TCDD by P. boydii. This allowed an estimation of the rate of degradation of 2,3,7,8-TCDD by P. boydii that can be used in the design of the bioreactor system. |
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Keywords: | 2,3,7,8-Tetrachlorodibenzo-p-dioxin Pseudallescheria boydii Biodegradation rate Design of bioreactor system |
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