Candida tropicalisのフェノール分解に対する環境因子 : フェノールの微生物学的分解に関する研究(第5報)

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Candida tropicalis No. 708 isolated from sewage was able to metabolize substantial amounts of phenol as the sole source of carbon. In order to obtain the basic data for contiunous treatment of waste water containing phenol using the strain No. 708,the kinetics of the oxidative degradation of phenol were studied. The studies were concerned with the adaptive pretreatment to induce the phenol-degrading enzyme system and the effect of certain environmetal conditions (pH, temperature, concentration of phenol, and dissolved oxygen, etc.) on the activity of phenol degradation. Candida tropicalis No. 708 became quickly adapted to the medium with 500 ppm of phenol and ultimately grew without the lag period after more than 4 hr adaptation.The results of kinetic studies on phenol degradation with phenol adapted cells indicated that the decomposition of phenol conformed to the Monod equation over a limited lower range of phenol concentration but deviated at higher concentrations (>500ppm) in that the speicific rate of growth, μ, and of phenol consumption, σ, progressively fell off and was reduced almost to zero at 2,000ppm of phenol. Consequentially, the optimum concentration of phenol was between 200 and 500ppm. Under these conditions, the maximum specific rates of growth, μ_m, and of phenol consumption, σ_m, were 0.22hr^<-1> and 0.45mg phenol/mg cell・hr, respectively. It was found from these kinetic constants that C. tropicalis No. 708 showed a high ability ot degrade phenol.As the metabolism of phenol by C. tropicalis No. 708 is aerobic, the effect of the oxygen transfer coefficinet, K_La, on μ and σ was studied. The values of μ and σ increased with the increase in the K_La value, until it approached 15hr^<-1> which gave the critical concentraion of dissolved oxygen, 1.0 ppm ; above this value, there was no enhancement in the values of μ and σ.
社団法人日本生物工学会の論文
1973-11-25

Candida tropicalisのフェノール分解に対する環境因子 : フェノールの微生物学的分解に関する研究(第5報)

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