| Project/Area Number |
11650798
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
反応・分離工学
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| Research Institution | Shizuoka University |
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Principal Investigator |
UCHIDA Shigeo Shizuoka University, Dept.Mat.Sci & Chem.Eng., Professor, 工学部, 教授 (10023194)
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| Co-Investigator(Kenkyū-buntansha) |
MAEZAWA Akinori Shizuoka University, Dept.Mat.Sci & Chem.Eng., Assistant Professor, 工学部, 助手 (20209365)
OKAMURA Seichi Shizuoka University, Dept.Electro.Sci., Professor, 工学部, 教授 (20022014)
WARSITO 静岡大学, 工学部, 非常勤研究員
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1999: ¥3,000,000 (Direct Cost: ¥3,000,000)
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| Keywords | Waste water treatment / Ultrasound / Photo-catalysis / Aggregation / Surfactant |
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| Research Abstract |
In order to develop the new process for the waste water treatment, the decomposition of surfactant was carried out by using the photo-catalytic and sonolytic oxidations.
For the consecutive process, that is, after the concentration of total organic carbon (TOC) was considerably decreased with the photo-catalytic process, ultrasonic process was applied. The TOC concentration was slightly decreased by ultrasound irradiation. However, the TOC removal efficiency of 100% was not reached. It must be that the decomposition of TOC hardly progresses since the TOC concentration was too low.
For the combined process of the photo-catalysis and the sonolysis, the decomposition rate of surfactant decreased with the stirring speed. In the case of the lower stirring speed, the particles of the TiO_2 as photo-catalyst may be localized at the nodes of standing wave. Therefore, the apparent reactivity of catalyst decreases.
The aggregation and precipitation of the catalyst particles with glass beads were found when the ultrasonic at 26kHz was irradiated to the suspension of catalyst added the appropriate amount of glass beads. The dependency of the amount of added glass beads on the aggregation of the particles can be explained by the theory of Brant-Hiedemann.
The precipitates of the catalyst particles were re-dispersed by the irradiation of ultrasonic at 200kHz. The re-dispersed catalysts still held the same photo-activity as the raw catalysts.
From the above results, we propose a new hybrid process for waste water treatment. The process consists of two tanks. One is a decomposition tank with a low-pressure mercury lamp and an ultrasonic generator of high frequency. Another is a recovery tank with a ultrasonic generator of low frequency. Waste water is treated in the decomposition tank and flows into the recovery tank where the photo-catalyst particles are separated by the irradiation of ultrasonic at low frequency. Separated particles are returned to the decomposition tank.
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