Marine anammox bacteria: a new alternative filtering technology for the sustainable development of land-based recirculating aquaculture systems

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K19866
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 64:Environmental conservation measure and related fields
• Research Institution: Hiroshima University
• Principal Investigator: Kindaichi Tomonori 広島大学, 先進理工系科学研究科(工), 教授 (10379901)
• Project Period (FY): 2021-07-09 – 2024-03-31
• Keywords: 海洋性アナモックス細菌 / 閉鎖循環式陸上養殖 / 窒素除去

Outline of Final Research Achievements

Although it is important to obtain biomass of marine anammox bacteria to treat wastewater from recirculated land-based aquaculture systems, the culture conditions of marine anammox bacteria have not been optimized. Therefore, we focused on trace metal elements and phosphorus, which are added as culture medium components, and examined their effects on anammox activity. As for trace metal elements, the metal elements contained in the artificial seawater used for culture were sufficient for anammox activity. For phosphorus, a comparison was made by changing the phosphorus concentration in three levels, and there was no difference in anammox activity among the three conditions. These results suggest that reducing the amounts of trace metals and phosphorus that have been added as culture medium components in the past might be possible for maintaining the activity of marine anammox bacteria.

Free Research Field

排水処理工学

Academic Significance and Societal Importance of the Research Achievements

本研究は陸上養殖のデメリットであった排水処理コストの50％を削減し、海水交換頻度を1/10まで低減でき、窒素除去施設の面積を半分にできる、海水へアクセスしにくい内陸部での養殖が可能になるなど、これまでの閉鎖循環式陸上養殖の概念（構成要素・イメージ）を大きく変革させ、環境工学と水産学が融合した次世代型の陸上養殖システムの構築が可能となる。既にヨーテボリ大学養殖研究センターと連携体制にあり、各種海水魚養殖の実飼育水の入手が可能であり、コマーシャルベースでの普及への壁はない。国内では山間部においても陸上養殖が試みられており、海洋性アナモックス細菌による除去法を適用できる可能性が高い。