Among the novel system configurations that remove organic matter and nitrogen simultaneously, the structured bed reactor with recirculation and intermittent aeration (SBRRIA) can be mentioned. Studies addressing the SBRRIA have shown high efficiency of organic matter and nitrogen removal, as well as low sludge production. However, operational parameters such as the recirculation rate, intermittent aeration time, and airflow are not fully established. Therefore, this research aimed to evaluate the effect of these three parameters on the mixing characteristics of an SBRRIA adopting established hydrodynamic models, also proposing a new flow model for the reactor. Hydrodynamic tests were performed using sodium chloride as a tracer, and the variables were the recirculation rate, intermittent aeration time, and airflow. Results showed that the reactor presented a plug-flow behavior when the aeration was turned off and behaved as a completely stirred reactor when the aeration was turned on. Traditional models were not sufficient to explain the flow of the SBRRIA, resulting in the development of a simplified programming pseudo-code to adequately represent the flow in the reactor. The tested airflow and recirculation rates did not affect the mixing behavior in the SBRRIA. These observations represent a significant advance in SBRRIA studies as they show that energy consumption could be optimized, making the system even more advantageous by saving electrical energy up to 75% due to pumping.

在同时去除有机物和氮的新颖系统配置中，可以提及具有再循环和间歇曝气的结构化床反应器（SBRRIA）。针对SBRRIA的研究表明，有机物和氮的去除效率很高，并且污泥产量低。但是，诸如再循环率，间歇通气时间和气流等操作参数尚未完全确定。因此，本研究旨在通过建立的水动力模型评估这三个参数对SBRRIA混合特性的影响，并为反应堆提出新的流动模型。使用氯化钠作为示踪剂进行了流体动力学测试，变量为再循环速率，间歇曝气时间和气流。结果表明，当曝气关闭时，反应器呈现出活塞流行为；当曝气开启时，其表现为完全搅拌的反应器。传统模型不足以解释SBRRIA的流程，导致开发了简化的编程伪代码以充分表示反应堆中的流量。测试的气流和再循环速率不影响SBRRIA中的混合行为。这些观察结果表明SBRRIA研究取得了重大进展，因为它们表明可以优化能耗，通过泵送节省多达75％的电能，从而使系统更具优势。传统模型不足以解释SBRRIA的流程，导致开发了简化的编程伪代码以充分表示反应堆中的流量。测试的气流和再循环速率不影响SBRRIA中的混合行为。这些观察结果表明SBRRIA研究取得了重大进展，因为它们表明可以优化能耗，通过泵送节省多达75％的电能，从而使系统更具优势。传统模型不足以解释SBRRIA的流程，导致开发了简化的编程伪代码以充分表示反应堆中的流量。测试的气流和再循环速率不影响SBRRIA中的混合行为。这些观察结果表明SBRRIA研究取得了重大进展，因为它们表明可以优化能耗，通过泵送节省多达75％的电能，从而使系统更具优势。