Department of Science of Technology Innovation, Nagaoka University of Technology, Nagaoka, 940-2188, Japan.
Department of Civil Engineering, Thammasat School of Engineering, Thammasat University, Pathumthani 12120, Thailand.
Bioresour Technol. 2024 Dec;413:131496. doi: 10.1016/j.biortech.2024.131496. Epub 2024 Sep 17.
This study presents a novel approach to sustainable aquaculture by integrating biofloc technology (BFT) with a compact down-flow hanging sponge (DHS) reactor. The integrated BFT-DHS system effectively removed nitrogen compounds while maintaining ammonia-nitrogen (NH-N) concentrations below 1 mg-N L without water exchange. Application of this system in a tank bred with juvenile Oreochromis niloticus showed a high NH-N removal rate of up to 97 % and nitrite (NO -N) concentrations were maintained at 0.1 ± 0.1 mg-N L. Microbial analysis revealed Gordonia as the predominant genus in the biofloc contributing to heterotrophic nitrification, while the Peptostreptococcaceae family dominated the DHS reactor. Heterotrophic nitrification seemed to be the primary process for enhanced nitrogen removal. Pathogenic bacteria, Vibrio sp. was absent throughout the study. This study highlights the potential integration of BFT and DHS system for sustainable aquaculture practice with effective nitrogen removal.
本研究提出了一种将生物絮团技术（BFT）与紧凑下流式悬挂海绵（DHS）反应器相结合的可持续水产养殖新方法。该集成的 BFT-DHS 系统在不换水的情况下，有效去除了氮化合物，同时将氨氮（NH-N）浓度维持在 1mg-N L 以下。该系统在一个养殖幼年尼罗罗非鱼的水箱中的应用表明，NH-N 的去除率高达 97%，亚硝酸盐（NO -N）浓度维持在 0.1±0.1mg-N L。微生物分析表明，生物絮团中的优势属为戈登氏菌，有助于异养硝化，而 DHS 反应器中则以消化链球菌科为主导。异养硝化似乎是增强氮去除的主要过程。在整个研究过程中，致病性细菌弧菌均未检出。本研究强调了 BFT 和 DHS 系统在可持续水产养殖实践中的潜在整合，具有有效的氮去除效果。
