Zero water exchange aquarium system; A new approach towards a sustainable and low management aquarium system

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K23362
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 1101:Environmental analyses and evaluation, environmental conservation measure and related fields
• Research Institution: Nagaoka University of Technology
• Principal Investigator: NUR ADLIN BINTI ABU BAKAR 長岡技術科学大学, 工学研究科, 助教 (70883958)
• Project Period (FY): 2020-09-11 – 2023-03-31
• Keywords: 窒素除去 / リン除去 / 生物学的水処理 / 閉鎖循環型養殖システム

Outline of Final Research Achievements

In this study, we developed a closed circulation aquaculture system capable of conducting a simultaneous removal of nitrogen and phosphorus compounds. The system has successfully removed ammonia, nitrite and nitrate nitrogen from the aquaria. Hence, maintaining a safe and viable environment for fish to survive despite limited water exchange was performed. The average ammonia-nitrogen, nitrite-nitrogen, and nitrate-nitrogen concentrations in the breeding tank were 0.10±0.04 mg-N/L, 0.14±0.02 mg-N/L, and 9.00±1.00 mg-N/L, respectively. The average phosphorus concentration in the aquarium was 17.8±0.76 mg-P/L. Phosphorus adsorption was confirmed, but further studies is required to improve the amount of phosphorus adsorption.

Free Research Field

環境解析評価、環境保全対策およびその関連分野

Academic Significance and Societal Importance of the Research Achievements

水資源を富む国では養殖によって水産物を生産することが出来るが，水交換が必要であることから水不足の国々及び内陸での養殖は困難を極める．今後10年で水不足の問題はより深刻になると考えられている。本研究は，省エネルギー型生物学的処理技術であるDHS-USBシステムを陸上養殖に導入により窒素およびリン化合物を同時除去によって目指した閉鎖循環型養殖システムの構築ができ、水交換の必要性を減らすことができた。本システムの成功は水産養殖業界に計り知れない利益をもたらす。