| Project/Area Number |
59460146
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
都市工学・衛生工学
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| Research Institution | Hokkaido University, Faculty of Engineering |
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Principal Investigator |
TAMBO Norihito Professor, Faculty of Engineering, Hokkaido University, 工学部, 教授 (80001147)
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| Co-Investigator(Kenkyū-buntansha) |
KAMEI Tasuku Associate Professor, Faculty of Engineering, Hokkaido University, 工学部, 助教授 (70001998)
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| Project Period (FY) |
1984 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥7,900,000 (Direct Cost: ¥7,900,000)
Fiscal Year 1986: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1985: ¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 1984: ¥3,700,000 (Direct Cost: ¥3,700,000)
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| Keywords | THM / TOX / Organic halogens / Humic Substances / Reaction kinetics / 生成量予測 |
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| Research Abstract |
A series of kinetic studies to evaluate trihalomethane (THM) and total organic halogen formation in chlorination process of water and wastewater treatment was carried out. The results are summarized as follows: 1) Major precursors in natural and urban water systems are humic substances being characterized as DOC which shows UV adsorption at 260nm ( <E_(260)> ). 2) Three kinds of reactive functional group with <Cl_2> on the humic substances are defined with respect to their reaction rate. 3) The amount of <Cl_2> distributed on those functional groups are calculated from <Cl_2> / <E_(260)> ratio. 4) The reactions of TOX and THM formation proceed as a consecutive parallel reaction with the above mentioned three kinds of active functional group reacting. 5) The maximum amount of THM and TOX formation is obtainable in one hour with elevated 80゜C reaction temperature. 6) Many maximum amounts of THM and TOX were examined with both the elevated and normal temperature conditions. From the results, functions to give the maximum values were derived with respect to ratio <Cl_2> / <E_(260)> . 7) From the above-mentioned results, when <Cl_2> / <E_(260)> value and maximum THM or TOX formation or <Cl_2> consumption value are given, whole kinetic behaviors of TOX or THM formation and the decrease of residual chlorine are possible to calculate with accuracy.
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