2023 Fiscal Year Final Research Report
Fouling-free membrane filtration with submicron-sized super-fine activated carbon precoating and high-basicity PACl coagulant
| Project/Area Number |
21H04567
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Medium-sized Section 22:Civil engineering and related fields
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
松下 拓 北海道大学, 工学研究院, 教授 (30283401)
白崎 伸隆 北海道大学, 工学研究院, 准教授 (60604692)
安藤 直哉 北海学園大学, 工学部, 准教授 (20847595)
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| Project Period (FY) |
2021-04-05 – 2024-03-31
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| Keywords | 環境技術 / 環境材料 / 土木環境工学 / 反応・分離工学 / 水資源 |
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| Outline of Final Research Achievements |
The pretreatment method using pulsed addition of submicron-sized super-fine powdered activated carbon (SSPAC) was applied to three different types of membrane filtration. They are a tubular ceramic inorganic and an organic immersed-membrane filtration system both for vacuum-driven outside-in filtration, and a monolithic ceramic membrane system for pressure-driven inside-out filtration. The results showed that pulse dosing of SSPAC mitigated the increase in trance-membrane pressure rise for the inorganic and organic immersed-membrane filtration systems, due to the precoating and adsorption effects of the SSPAC layer. Pulse dosing of SSPAC combined with a coagulant formed precoat layer on the membrane that was easily removed by hydraulic backwashing. In the monolithic ceramic membrane system, the effectiveness of the cross-flow method for uniform precoat formation was suggested.
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| Free Research Field |
水環境工学
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| Academic Significance and Societal Importance of the Research Achievements |
水問題の有力な解決技術として膜分離技術が期待され，その中で MF膜は操作圧が低く適用拡大が期待されて久しいが，普及率が高い状況にはない．この理由は、膜自体が目詰まり（膜ファウリング）を起こしやすく、ろ過のためのエネルギー消費が大きくなる点にあり、このことが膜分離の水処理への普及の最大の障壁となっている．本研究では，この課題の解決策として，超微粉炭（粒径200 nm）、パルス／短期間添加による膜のプレコート、超高塩基度ポリ塩化アルミニウムを検討対象とし、膜ファウリングの革新的抑制技術を開発するとともに、そのメカニズムを解明し、ろ過性と処理水質の両方に優れた前処理－膜ろ過法を提案した．
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