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

2018 Fiscal Year Final Research Report

• 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
• Keywords: 天然凝集剤 / アルギン酸

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.

Free Research Field

高分子化学

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。