Abstract The aim of the present study was to propose a low-cost nitrogen removal system through the nitrification / denitrification process in order to maintain the water quality required for the Pacific white shrimp superintensive cultivation in closed systems without water renewal. The increase in productivity consequently causes the accumulation of organic matter and nitrogenous compounds, especially ammonia nitrogen and nitrite, which in high concentrations can be lethal to aquatic organisms. In addition, the accumulation of solids in the system provides conditions for the emergence of opportunistic pathogens, microalgae booms, and increases the producer's cost of inputs to maintain the equilibrium physicochemical relationships required for shrimp farming. The experimental productive cycle lasted 36 days using Litopenaeus vannamei shrimps with 7.1 g ± 0.56 g and density of 350 shrimps m−³. The nitrogen removal efficiency observed during the study period was 71.3 ± 5.3 %, and the shrimp had a survival of 92.9 % and a final weight of 13.1 ± 1.4 g. Thus, we established a system (ammonia and nitrite), capable of managing solids without interaction with the sea, ensuring high biosecurity against exogenous diseases in marine shrimps farms.

中文翻译：

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硝化和反硝化工艺在生物絮团养殖太平洋白虾直接回用水系统中的应用

摘要 本研究的目的是通过硝化/反硝化过程提出一种低成本的脱氮系统，以保持太平洋白虾超集约化养殖在没有水更新的封闭系统中所需的水质。因此，生产力的提高导致有机物和含氮化合物的积累，尤其是氨氮和亚硝酸盐，这些物质在高浓度下对水生生物是致命的。此外，系统中固体的积累为机会性病原体的出现、微藻繁荣提供了条件，并增加了生产者的投入成本，以维持对虾养殖所需的平衡物理化学关系。实验生产周期为 36 天，使用 7.1 g ± 0.56 g 和 350 对虾 m-³ 的密度的南美白对虾。研究期间观察到的脱氮效率为 71.3 ± 5.3 %，虾的存活率为 92.9 %，最终重量为 13.1 ± 1.4 克。因此，我们建立了一个系统（氨和亚硝酸盐），能够在不与海洋相互作用的情况下管理固体，确保海水虾养殖场抵御外源性疾病的高度生物安全性。