| Project/Area Number |
14350284
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Civil and environmental engineering
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| Research Institution | Gifu University |
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Principal Investigator |
MATSUI Yoshihiko Gifu University, Faculty of Engineering, Professor, 工学部, 教授 (00173790)
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| Co-Investigator(Kenkyū-buntansha) |
INOUE Takanobu Toyohasi University of Technology, Department of Architecture and Civil Engineering, Professor, 工学部, 教授 (00184755)
MATSUSHITA Taku Gifu University, Faculty of Engineering, Research Ass., 工学部, 助手 (30283401)
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| Project Period (FY) |
2002 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥5,600,000 (Direct Cost: ¥5,600,000)
Fiscal Year 2004: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2003: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2002: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Keywords | coagulation / flocculation / aluminum / ferric coagulant / coagulant / polyaluminum chloride / virus / bacteriophage |
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| Research Abstract |
Inorganic aluminum salts, such as aluminum sulfate, are coagulants that cause small particles, such as bacteria and viruses as well as inorganic particles, to destabilize and combine into larger aggregates. In this investigation, batch coagulation treatments of water samples spiked with Qβ, MS2, T4, and P1 viruses were conducted with 4 different aluminum coagulants. The total infectious virus concentration in the suspension of floc particles that eventually formed by dosing with coagulant was measured after the floc particles were dissolved by raising the pH with an alkaline beef extract solution. The virus concentrations were extremely reduced after the water samples were dosed with aluminum coagulants. Viruses mixed with and adsorbed onto preformed aluminum hydroxide floc were, however, completely recovered after the floc dissolution. These results indicated that the aluminum coagulation process inactivates viruses. Virucidal activity was most prominent with the prehydrolyzed aluminum salt coagulant, polyaluminum chloride (PAC). Virucidal activity was lower in river water than in ultra-pure water-natural organic matter in the river water depressed the vrucidal activity. Mechanisms and kinetics of the virus inactivation were discussed. Our results suggest that intermediate polymers formed during hydrolysis of the aluminum coagulants sorbed strongly to viruses, either rendering them inactive or preventing infectivity.
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