Rather than direct nutrient removal from wastewaters, an alternative approach aimed at nutrient recovery from aquacultural wastewaters could enable sustainable management for aquaculture production. This study demonstrated the feasibility of cultivating marine macroalgae (Chaetomorpha maxima) with a moving bed bioreactor (MBBR-MA), to remove nitrogen and phosphorus in aquaculture wastewater as well as to produce macroalgae biomass. MBBR-MA significantly increased the simultaneous removal of nitrate and phosphate in comparison with only MBBR, resulting in an average total nitrogen (TN) and total phosphorus (TP) removal efficiency of % and %, respectively, in MBBR-MA while MBBR had no capacity for TN and TP removal. No chemical oxygen demand (COD) removal was detected in both reactors. Phosphorus could be a limiting factor for nitrogen uptake when N : P ratio increased. The recovered nitrogen and phosphorus resulted in a specific growth rate of 3.86%–10.35%/day for C. maxima with an uptake N : P ratio of 6. The presence of macroalgae changed the microbial community in both the biofilter and water by decreasing the relative abundance of Proteobacteria and Nitrospirae and increasing the abundance of Bacteroidetes. These findings indicate that the integration of the macroalgae C. maxima with MBBR could represent an effective wastewater treatment option, especially for marine recirculating aquaculture systems.

中文翻译：

---

将海洋大型藻类（Chaetomorpha maxima）与移动床生物反应器集成在一起，以去除海水养殖废水中的营养。

替代直接从废水中去除营养物的方法，旨在从水产养殖废水中回收营养物的替代方法可以实现水产养殖生产的可持续管理。这项研究证明了用移动床生物反应器（MBBR-MA）培养海洋大型藻类（Chaetomorpha maxima）的可行性，以去除水产养殖废水中的氮和磷以及生产大型藻类生物质。与仅MBBR相比，MBBR-MA显着提高了同时去除硝酸盐和磷酸盐的能力，因此平均去除总氮（TN）和总磷（TP）的效率为％和 MBBR-MA中的百分比分别为％，而MBBR没有TN和TP去除的能力。在两个反应器中均未检测到化学需氧量（COD）去除。当氮磷比增加时，磷可能是氮吸收的限制因素。回收的氮和磷导致最大C的比生长速率为3.86％–10.35％/天，吸收的N：P比率为6。大型藻类的存在通过降低生物滤池和水中的微生物群落而改变了微生物群落。变形杆菌和硝化螺旋菌的相对丰度，增加了拟杆菌的丰度。这些发现表明，大型藻类的最大梭菌与MBBR的整合可以代表一种有效的废水处理方案，特别是对于海洋循环水产养殖系统而言。