Department of Science of Technology Innovation, Nagaoka University of Technology, Nagaoka, Japan.
Department of Biological Science and Technology, Kanazawa University, Kanazawa, Japan.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2024;59(7):358-368. doi: 10.1080/10934529.2024.2399444. Epub 2024 Sep 11.
Aquaponics is a promising solution for addressing food security concerns. Nonetheless, an effective water-purification system is necessary to achieve high and stable yields of fish and vegetables. This study aimed to evaluate the nitrification and oxygen transfer performance of a laboratory-scale down-flow hanging sponge (DHS) reactor with aquaponics system to treat water in an closed-aquaculture system. The DHS reactor showed a higher oxygen transfer coefficient ( than the conventional aerator and provided an adequate dissolved oxygen (DO) concentration of approximately 5.5 mg/L essential for growth throughout the experimental period. The evaluated DHS-based aquaponic system maintained high water quality in an aquaculture tank, with a survival rate of 97%. The grew at a low feed conversion ratio of 1.5-2.1 and a low feeding rate of 0.5% at high stocking densities of 17.5-22.2 kg-fish-weight/m. 16S rRNA gene sequencing indicated that the DHS sponge carrier effectively retained nitrifying bacteria such as and . This study demonstrated that the DHS reactor provided a high DO concentration and that a simultaneous DHS reactor with a hydroponic tank provided a low-cost aquaponic system that could be applied for food production in the aquaculture industry.
水培系统是解决食品安全问题的有前途的解决方案。然而，需要有效的水净化系统才能实现鱼类和蔬菜的高产和稳产。本研究旨在评估带有水产养殖系统的实验室规模下流式悬挂海绵（DHS）反应器在处理封闭水产养殖系统中的水的硝化和氧气转移性能。DHS 反应器的氧气转移系数（KLa）高于传统曝气器，并提供了约 5.5mg/L 的充足溶解氧（DO）浓度，这是生长所必需的，整个实验期间。所评估的基于 DHS 的水产养殖系统在水产养殖池中保持了高水质，成活率为 97%。在此期间，在 17.5-22.2kg 鱼重/m3 的高放养密度下，以 1.5-2.1 的低饲料转化率和 0.5%的低投喂率生长。16S rRNA 基因测序表明，DHS 海绵载体有效地保留了硝化细菌，如 和 。本研究表明，DHS 反应器提供了高 DO 浓度，并且与水培罐同时使用的 DHS 反应器提供了低成本的水产养殖系统，可应用于水产养殖行业的食品生产。
