The aim of this work was to evaluate the use of effluent from a Biofloc System (BFT) as a fertilizer for the red seaweed Kappaphycus alvarezii cultivated in tanks and analyze its influence on carrageenan yield and quality. Firstly, the optimum effluent concentration and period for enrichment were determined by an in vitro study. The seedlings were then cultivated for 7 days in two different culture media: 50% von Stosch solution (V) and 25% BFT (B), both diluted in sterilized seawater. Seaweeds cultivated only in sterilized seawater were used as a control (C). After this period, all plants were grown in only sterilized seawater for a further 28 days. Seedlings from V (1.05 ± 0.02% day⁻¹) and B (1.13 ± 0.01% day⁻¹) showed no significant differences in growth rates, being both higher than the control (0.91 ± 0.06% day⁻¹). Seedlings from V and B also removed a greater quantity of nitrate (58.39% and 22.97%, respectively). Seedlings from V removed 100% phosphate, while those from B removed 83.58%. The tissue nitrogen content was higher only in the V. Although no significant differences were observed among treatments in the carrageenan yield, significantly higher gel strength and viscosity were observed in B (248.85 g cm⁻² and 19.89 mPa s, respectively). According to the results, BFT effluent can be used to replace von Stosch solution to grow K. alvarezii in tanks. At the same time, the seaweed, together with bacteria and microalgae from the effluent, can be an effective biofilter in IMTA systems using bioflocs.

这项工作的目的是评估使用生物絮凝剂系统（BFT）的出水作为坦克中种植的红海藻Kappaphycus alvarezii的肥料，并分析其对角叉菜胶产量和品质的影响。首先，通过体外研究确定最佳的浓缩浓度和浓缩时间。然后将幼苗在两种不同的培养基中培养7天：50％的von Stosch溶液（V）和25％的BFT（B），均在无菌海水中稀释。仅在灭菌海水中种植的海藻用作对照（C）。在此期间之后，所有植物仅在灭菌的海水中再生长28天。V（1.05±0.02％day ^-1）和B（1.13±0.01％day ^-1）没有显示出显着的增长率差异，均高于对照组（0.91±0.06％day ^-1）。V和B的幼苗也去除了大量的硝酸盐（分别为58.39％和22.97％）。V的幼苗去除了100％的磷酸盐，而B的幼苗去除了83.58％。组织氮含量仅在V中较高。尽管在各处理中角叉菜胶产量未观察到显着差异，但在B中观察到明显更高的凝胶强度和粘度（分别为248.85 g cm ^-2和19.89 mPa s）。根据结果​​，BFT废水可以用来替代冯·斯托施溶液来生长阿尔瓦雷茨氏菌。在坦克中。同时，在使用生物絮凝剂的IMTA系统中，海藻与污水中的细菌和微藻一起可以成为一种有效的生物滤池。