2022 Fiscal Year Final Research Report
Removal of fluoride and arsenic by an electrolysis system with a perforated plate as a diaphragm
| Project/Area Number |
20K04754
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 22060:Environmental systems for civil engineering-related
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| Research Institution | Toyama Prefectural University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 多孔板 / スリット板 / フッ素 / ヒ素 / 電解法 |
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| Outline of Final Research Achievements |
Electrolysis was used to remove fluoride and arsenic from drinking water and from wastewater. In the electrolysis system, anode cell and cathode cell was separated by a perforated plate with many holes with a diameter of 0.8 mm. As electrolysis progrssed, pH in the cathode cell increased to produce precipitation of magnesium hydroxide. Fluoride and arsenic was co-precipitated with magnesium hydroxide. By this method, fluorine was removed from synthetic well water of Sri Lanka, and Gero hot spring water. Also, arsenic was be removed from synthetic well water of Bangladesh. Finally, fluoride and arsenic was removed more effectively by opening slits instead of holes for the diaphragm.
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| Free Research Field |
水処理工学
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| Academic Significance and Societal Importance of the Research Achievements |
隔膜に多孔板やスリット板を用いた電解法により、飲料水や廃水からフッ素やヒ素の除去に成功した。陰極で生成する水酸化マグネシウムとの共沈により、フッ素やヒ素を除去するため、原水にマグネシウムがもともと含まれている場合には、外部から試薬を添加する必要が無い。また、隔膜にセラミックなどの多孔質板では無く、プラスチックを用いた多孔板やスリット板を用いることで安価な装置が実現できた。また、セラミックなどの多孔質の材料とは異なり、孔やスリット幅が大きいため、隔膜の閉塞を防ぐことができた。これらのことから、発展途上国での利用や温泉旅館での利用が期待できる。
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