ABSTRACT

The Structured Bed Reactor with Recirculation and Intermittent Aeration (SBRRIA) is a reactor configuration that presents high efficiency of organic matter and nitrogen removal, besides low sludge production. However, operational parameters, as the recirculation rate, aeration time, and airflow, are not fully established. A bench-scale structured bed reactor with intermittent aeration was fed with synthetic effluent simulating the characteristics of sanitary sewage. The reactor was operated for 280 days with an operational hydraulic retention time (HRT) of 10 h. The reactor was operated without effluent recirculation for the first time since this approach was not yet reported, and was named Structured Bed Reactor with Intermittent Aeration (SBRIA). The COD removal was higher than 81% for all operational conditions, and the total nitrogen removal ranged from 10 to 80%. The highest efficiencies were obtained with an aeration time of 1 h 45 min (total cycle of 3 h) and an airflow rate of 4.5 L.min⁻¹. Different nitrification and denitrification behaviours were observed, resulting in nitrification efficiencies over 90% when the reactor was submitted to higher aeration times and denitrification efficiencies above 90% when the reactor was submitted to low aeration times. The airflow ranges tested in this study affected the nitrification and the total nitrogen efficiencies. Even without effluent recirculation, the temporal profile showed that there were no peaks in the concentration of the nitrogen forms in the reactor effluent, saving electrical energy up to 75% due to pumping.

摘要

具有再循环和间歇曝气的结构化床反应器 (SBRRIA) 是一种反应器配置，除了低污泥产量外，还具有高效的有机物和氮去除。然而，操作参数，如再循环率、曝气时间和气流，还没有完全确定。向具有间歇曝气的台式结构床反应器进料模拟生活污水特性的合成流出物。反应器运行 280 天，运行水力停留时间 (HRT) 为 10 小时。由于这种方法尚未被报道，该反应器首次在没有流出物再循环的情况下运行，并被命名为具有间歇曝气的结构化床反应器 (SBRIA)。在所有操作条件下，COD 去除率均高于 81%，总氮去除率为10%～80%。曝气时间为 1 小时 45 分钟（总周期为 3 小时）和 4.5 L.min 的气流速率获得了最高效率^-1。观察到不同的硝化和反硝化行为，当反应器经受较高曝气时间时，硝化效率超过90%，而当反应器经受低曝气时间时，反硝化效率在90%以上。本研究中测试的气流范围影响了硝化作用和总氮效率。即使没有流出物再循环，时间曲线也显示反应器流出物中氮形式的浓度没有峰值，由于泵送，节省了高达 75% 的电能。