Development of hypoxia control method in closed bay by enhancing transfer function of electron in bottom sediment

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K14332
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Civil and environmental engineering
• Research Institution: Yamaguchi University
• Principal Investigator: IMAI Tsuyoshi 山口大学, 大学院創成科学研究科, 教授 (20263791)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 電子授受機能 / 堆積物燃料電池 / 底質 / 閉鎖性水域 / 貧酸素化抑制手法

Outline of Final Research Achievements

In this study, sediment microbial fuel cells (SMFCs) were focused as the hypoxia control method in closed bay by enhancing transfer function of electron in bottom sediment. As the experimental results, it is showed that 95% of electric generation of SMFCs came from the metabolism of the microorganisms and 5% of that came from an inorganic matter in bottom sediment. SMFCs were operated for 90days with turn-on or turn-off the electricity line, oxygen utilization rate of sediment was decreased 24% in turn-on condition compared with turn-off condition. Additionally, as the ORP value is extremely high in turn-on condition compared with turn-off condition, it is clearly showed that anaerobic condition in bottom sediment can be improved by introduction of SMFCs. And it is showed the possibility that the purification area in bottom sediment can be expanded by mixing/spreading of an appropriate amount of magnetite. As stated above, the main objective of this study was accomplished.

Free Research Field

環境工学、衛生工学