Research and development of water bloom reduction by diatoms of destruction Microcystis colonies

2014 Fiscal Year Final Research Report

• Project/Area Number: 25550057
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Environmental engineering and reduction of environmental burden
• Research Institution: Kyushu University
• Principal Investigator: HAO AIMIN 九州大学, 学内共同利用施設等, 研究員 (40586971)
• Co-Investigator(Kenkyū-buntansha): KUBA Takahiro 九州大学, 大学院工学研究院, 教授 (60284527) ; NISIMURA Kohe ; HAYASHITA Megumu
• Co-Investigator(Renkei-kenkyūsha): HARAGUCHI Tomokazu 佐賀大学, 農学部附属アグリ創生教育研究センター, 准教授 (90346833)
• Research Collaborator: ISERI Yasushi 西日本技術開発株式会社, 環境部, 部長代理
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: Microcystis colonies / Nitzschia palea / Biomass / water quality / competition environment

Outline of Final Research Achievements

Under this research, we have investigated effectiveness of water bloom reduction by a supply of silicate nutrients and installing attachment carriers on the site and at laboratory experiment, and through changes of algae and water quality. The research results show that proliferations of diatoms such as Nitzschia palea and green algae such as Ankistrodesmus spp. are enhanced and a proliferation of Cyanobacteria such as Microcystis spp. is suppressed. Additionally, as a new finding, we have observed rapid extinction of Microcystis spp. through invasion and destruction by Nitzschia palea of Microcystis colonies. It is expected that this method can be applied as one of water bloom prevention methods.

Free Research Field

水環境工学