In this work, simplified steady-state and dynamic models of a Recirculating Aquaculture System (RAS) of Atlantic salmon (Salmo salar) are described. The RAS process under study includes a fish tank, a biofilter, a CO₂ stripper, and an oxygen cone. Compared to existing models, the main contribution is that it explicitly models the pH, by using reaction invariants such as total inorganic carbon (TIC), total ammonia nitrogen (TAN), and alkalinity. As the possibility of placing the pH/alkalinity adjustment (base or buffer addition) into the fish tank or into the biofilter was considered, four steady-state scenarios were studied, where one of the adjustments is utilized in each scenario. A dynamic simulation of the process with oxygen and pH controllers was performed and compared with commercial RAS production data, and what adjustments had to be done to get an agreement between the model and the plant data.

在这项工作中，描述了大西洋鲑鱼（ Salmo salar）循环水产养殖系统（RAS）的简化稳态和动态模型。正在研究的RAS工艺包括鱼缸、生物过滤器、CO ₂汽提器和氧气锥。与现有模型相比，主要贡献在于它通过使用总无机碳等反应不变量来明确模拟 pH(TIC)、总氨氮 (TAN) 和碱度。由于考虑将 pH/碱度调节（碱或缓冲液添加）放入鱼缸或生物过滤器中的可能性，研究了四种稳态情景，其中每种情景中都使用其中一种调节。使用氧气和 pH 控制器对过程进行动态模拟，并将其与商业 RAS 生产数据进行比较，以及必须进行哪些调整才能在模型和工厂数据之间取得一致。