On Plant Test of Oxidation Reaction by Chemoautorophic Bacteria under the low-pH. unsteady state condition
| Project/Area Number |
01850139
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
資源開発工学
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| Research Institution | Tohoku Univ. |
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Principal Investigator |
KOUNOSU AKira Tohoku Univ. Fac. of Eng. Associate professor, 工学部, 助教授 (20089791)
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| Co-Investigator(Kenkyū-buntansha) |
INOUE Chihiro Dowa Mining Co. Researcher, 中央研究所, 研究員
NIIBORI Yuichi Tohoku Univ. Fac. of Eng. Research associate, 工学部, 助手 (90180562)
ENOMOTO Heizi Tohoku Univ. Fac. of Eng. Professor, 工学部, 教授 (80005412)
NAKAZAWA Hiroshi Iwate Univ. Fac. of Eng. Associate professor, 工学部, 助教授 (00113861)
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| Project Period (FY) |
1989 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥6,300,000 (Direct Cost: ¥6,300,000)
Fiscal Year 1991: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1990: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1989: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | Thiobacillus ferrooxidans / Enrichment Culture / Ferrous Sulfate / Oxidation Reaction Rate / Batch Plant Test / Rate Equation proposed / Low-pH Region / Control Mechanism / 反応速度 / 回分酸化反応 / パラメ-タ-値 / 酸化過程曲線 / 付養菌 / 反応条件 / 2パラメ-タ / 酵素反応型 |
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| Research Abstract |
The authors carried out some experiments for plant test of oxidation reaction, using Thiobacillus ferrooxidans. The conclusions are as follows :
(1) A new approximation equation proposed by this research stands for the reaction rate. The equation (a) is available in the technical point of view, and is a function accompanied by some factors which are compatible for the known, fundamental data.
(2) The equation is applied into the laboratory experiment data obtained from Tohoku Univ., Iwate Univ. and Dowa mining Co.
(3) Also, values in the initial Iron-oxidizing activity are measured from the oxidation experiment data under the various conditions.
The equation is derived, assuming a control mechanism of Thiobacillus ferrooxidans in low pH region :
((1+alpha)beta)t=1n((alpha+1-R_t)/(alphaR_t)) (a)
Symbols
alpha parameter of the rate equation, alpha=X_0/(Ys_0) [-]
beta Parameter of the rate equation, beta=kY [h^<-1>]
k reaction rate constant [mol cell^<-1> h^<-1>]
R_t control function at time t (R_t=[Fe^2]/([Fe^<3+>]+[Fe^<2+>]))
s substrate density at time t [mol m^<-3>]
s_0 initial substrate density [mol m^<-3>] : t reaction time [h]
Y yield factor [cell mol^<-1>]
X apparent cell density in the uncontrolled steady state (when R^t=1) [cell m^<-3>]
x_0 initial apparent cell density in the uncontrolled steady state [cell m^<-3>]
X'_0 initial cell density measured [cell mol^<-1>]
A_c A_c=1, Iron -oxidizing activity, when Fe^<2+> 100% [-]
A_0 A_0=X_0/X'_0, Iron-oxidizing activity of inoculum, when t=0 [-]
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Report
(4 results)
Research Products
(13 results)
