Preparation of one-step type tannin-conjugated natural flocculant by using metal salt and enzyme

• Project/Area Number: 16K00610
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental conscious materials and recycle
• Research Institution: Tokyo University of Marine Science and Technology
• Principal Investigator: Enoki Makiko 東京海洋大学, 学術研究院, 准教授 (90342758)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 天然凝集剤 / アルギン酸 / ペクチン / 環境材料 / 環境技術 / 機械材料・材料力学 / 水質汚濁・土壌汚染防止・浄化

Outline of Final Research Achievements

The algal and plant flocculants are two-step type flocculants which requires coagulant. In addition, their flocculation ability is lower than synthetic polymer flocculants. The aim of this study is to obtain one-step type algal and plant flocculant and to improve their flocculation ability by complexation reaction of tannin with enzyme and/or mixing metal salt.
As metal salts, magnesium and calcium salts were used, both of which gave one-step type flocculant. Relatively low concentration of calcium salt revealed to yield high functional one-step type flocculant with alginic acid which was active ingredient of algae.

Academic Significance and Societal Importance of the Research Achievements

凝集剤は汚水処理に欠かせない薬剤であるが、本研究の成果によって、カルシウムイオンの混合方法を工夫することで、海藻成分であるアルギン酸から一液型の高性能な凝集剤が得られることがわかった。この成果を海藻や陸上植物に応用することで、無毒で環境調和型の天然系凝集剤の実用性を高めることができる。このことは、有害性が懸念される無機系・合成高分子系凝集剤の代替物を与えることにつながり、安全で安心な水供給の実現に大きく貢献すると考えられる。

Research Products

• [Journal Article] Ascophyllum nodosumを原料とした天然凝集剤の調製条件が成分組成および凝集性能に及ぼす影響 (2016)
  • Author(s): 佐藤駿佑、小林蒼馬、榎牧子
  • Journal Title: 日本水産学会誌 Volume: 82 Pages: 939-944
  • Peer Reviewed
• [Presentation] Papain-catalyzed lysine-treated pectin as a flocculant: structure and flocculation properties (2017)
  • Author(s): Shunsuke SATO and Makiko ENOKI
  • Organizer: 8th International Conference on Green and Sustainable Chemistry
  • Int'l Joint Research
• [Presentation] アルギン酸を用いた一液型天然凝集剤の開発 (2016)
  • Author(s): 休波 巧, 佐藤 駿佑, 榎 牧子
  • Organizer: 第65回高分子学会年次大会
  • Place of Presentation: 神戸国際会議場
  • Year and Date: 2016-05-25
• [Presentation] 渡辺 兼樹, 榎 牧子 (2016)
  • Author(s): 成分分離を伴わない植物ベース凝集剤の調製
  • Organizer: 第65回高分子学会年次大会
  • Place of Presentation: 神戸国際会議場
  • Year and Date: 2016-05-25