2019 Fiscal Year Final Research Report
Target concentration and state of manganese in finished water for controlling drinking water discoloration
| Project/Area Number |
19K21087
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| Project/Area Number (Other) |
18H05918 (2018)
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund (2019)
Single-year Grants (2018) |
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| Review Section |
0303:Civil engineering, social systems engineering, safety engineering, disaster prevention engineering, and related fields
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2018-08-24 – 2020-03-31
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| Keywords | マンガン / 配水管 / 蓄積 / 物理付着 / 自触媒反応 / モデル化 / 浄水中の目標マンガン濃度 |
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| Outline of Final Research Achievements |
Trace manganese (Mn) in treated drinking water can accumulate in water distribution systems over a long period of time, which can eventually cause "black water" at customers' taps. This study revealed that there are two mechanisms for Mn accumulation in pipes: physical attachment of Mn particles and chemical oxidation by free chlorine. After developing the mathematical model of these pathways, the target value of Mn concentration in treated water was discussed for preventing the occurrence of "black water".
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| Free Research Field |
上水道工学
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| Academic Significance and Societal Importance of the Research Achievements |
これまで配水管内のマンガン(Mn)の蓄積は生物作用や重力沈降によると考えられてきたが、日本のような塩素消毒をしている配水管網においては残留塩素とMnとの化学酸化を介した蓄積が重要となることを初めて明らかにした。また、科学的根拠を持って黒水被害を防止するための浄水中Mn濃度を提示することができ、水道水の快適性を確保するために重要な知見を得ることができた。
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