| Project/Area Number |
19404013
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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 | 海外学術 |
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| Research Field |
Civil and environmental engineering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
TAKIZAWA Satoshi The University of Tokyo, 大学院・工学系研究科, 教授 (10206914)
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| Co-Investigator(Kenkyū-buntansha) |
TOKUNAGA Tomochika 東京大学, 大学院・新領域創成科学研究科, 准教授 (70237072)
OGUMA Kumiko 東京大学, 大学院・工学系研究科, 講師 (00361527)
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| Project Period (FY) |
2007 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥16,900,000 (Direct Cost: ¥13,000,000、Indirect Cost: ¥3,900,000)
Fiscal Year 2009: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2008: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2007: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
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| Keywords | フッ素 / 地下水 / 健康リスク / フッ素歯牙症 / 地理情報システム / 膜汚染 / シリカ / 逆浸透膜 / ノツ素歯牙症 |
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| Research Abstract |
People living in Lamphun Province in the Chiang Mai Basin, Thailand, are suffering from fluoride intake from groundwaters. In this study, fluoride concentration in the groundwaters, the current status of health effects, and fluoride intake were investigated. Ultra-low-pressure reverse osmosis membranes were used to remove fluoride from groundwaters. It was revealed that fluoride-laden groundwater is widely distributed in Lamphun Province, and the maximum concentration was 16.1mg/L. Although their drinking water has been switched from groundwater to fluoride-free bottled water, high fluoride concentration was detected in their urine samples. Since their families still use groundwater for cooking, it was found that cooked rice was the major intake source of fluoride. When the local reverse-osmosis membrane plants were investigated, it was found that fluoride was removed by these facilities, but most of the pre-treatment processes were not functioning. Both calcium and silica cause membrane fouling and bring down the permeability, but the removal rates of fluoride went up or down depending on the condition of membrane fouling.
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