Estimation of the biodegradation rate of 2,3,7,8-tetrachlorodibenzo-p-dioxin by using dioxin-degrading fungus, Pseudallescheria boydii.
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.
Ishii
Kazuei
K
Graduate School of Engineering, Hokkaido University, Japan. k-ishii@eng.hokudai.ac.jp
Furuichi
Toru
T
Tanikawa
Noboru
N
Kuboshima
Masaru
M
D001673:Biodegradation, Environmental; D019149:Bioreactors; D003470:Culture Media; D005947:Glucose / Q000378:metabolism / Q000494:pharmacology; D007700:Kinetics; D015233:Models, Statistical; D000072317:Polychlorinated Dibenzodioxins / Q000378:metabolism*; D011541:Pseudallescheria / Q000187:drug effects / Q000378:metabolism*
D003470:Culture Media; D000072317:Polychlorinated Dibenzodioxins; D005947:Glucose