2022 Fiscal Year Final Research Report

Construction of a photocatalyst/diamond electrode combination tank that purifies biological sewage-treated water to the utmost limit

Research Project

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Project/Area Number	20K06352
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 41050:Environmental agriculture-related
Research Institution	Tokyo University of Science
Principal Investigator	Suzuki Tomonori 東京理科大学, 教養教育研究院野田キャンパス教養部, 教授 (50256666)
Project Period (FY)	2020-04-01 – 2023-03-31
Keywords	光触媒 / ダイヤモンド電極 / 汚水処理 / 殺菌 / 細菌叢解析 / トリハロメタン / 有効遊離塩素 / 低環境負荷
Outline of Final Research Achievements	The purpose of this study was to develop a low environmental impact treatment system using a combination of a photocatalyst and a boron-doped diamond (BDD) electrode. The current value at which the decomposition rate of organic substances was high and the amount of chloroform, which is a trihalomethane, was low was set to 30 mA. A synergistic effect was confirmed in organic matter decomposition by using the combination of a photocatalyst and a BDD electrode, but it was confirmed that there was the presence of bacteria that could not be sterilized. It was also suggested that peptidoglycan is also involved in the bactericidal resistance mechanism. Compared to the BDD electrode alone, it was confirmed that the amount of effective free chlorine generation could be suppressed to 10% by using the combination with a photocatalyst, so it has been shown that this combined treatment system may be a technology that is less likely to generate environmental pollutants.
Free Research Field	微生物制御学
Academic Significance and Societal Importance of the Research Achievements	光触媒反応は汚水処理にあまり有効ではないとの研究がこれまでには報告されていたが、本研究により、BDD電極反応を併用することで、相乗効果的に有機物を分解することが示された。また、BDD電極単独で汚水処理を行うとクロロホルムが生成されてしまうが、光触媒反応を併用することで、クロロホルムの生成が大きく抑えられることも示された。つまり、本研究により環境低負荷な汚水処理システムの構築が可能となった。本併用処理システムによって殺菌も可能であることが示されたが、完全殺菌は達成されなかった。しかし、殺菌メカニズムの一端が本研究で示唆されたことで、完全殺菌に向けた改良方策も考案できると思われる。