Departamento de Hidráulica e Saneamento e Escola de Engenharia de São Carlos e Universidade de São Paulo (SHS/EESC/USP), Av. Trabalhador São-Carlense 400, CEP 13566-590 São Carlos - SP, Brazil.
J Environ Manage. 2012 May 15;98:163-7. doi: 10.1016/j.jenvman.2012.01.009. Epub 2012 Jan 24.
The removal of nitrogen and organic matter using a single reactor has been a common focus of investigation, and reactors operated in batch mode and under intermittent aeration have attracted special attention. This study aimed to evaluate the application of a new reactor configuration consisting of a fixed-bed reactor that was operated under conditions of continuous feeding and intermittent aeration. The reactor was built using acrylic, with a working volume of 6.1L. The fixed bed used for biomass support was composed of polyurethane foam cylinders vertically oriented inside the reaction zone. The reactor was operated under intermittent aeration (2h aerated and 1h non-aerated) and a recirculation ratio Q(r)/Q=5. Three different operating conditions (Phase I, Phase II, and Phase III) corresponding to hydraulic retention times (HRT) of 12h, 8h, and 10h, respectively, were tested. In Phase I, the system achieved total nitrogen (TN) and chemical oxygen demand (COD) removal efficiencies of 82% and 89%, respectively. At HRTs of 8 h and 10 h, the reactor was unstable with respect to TN removal, and the average resultant removal efficiencies were 49% and 45%, respectively. However, COD removal efficiencies remained high with mean values of 85% and 88% for Phases II and III, respectively. Based on these results, it can be concluded that this new reactor configuration constitutes an alternative method for effective removal of organic matter and nitrogen from wastewater.
采用单一反应器去除氮和有机物一直是研究的重点，间歇曝气操作的反应器受到了特别关注。本研究旨在评估一种新型反应器配置的应用，该配置由连续进料和间歇曝气操作的固定床反应器组成。该反应器采用亚克力制成，工作容积为 6.1L。用于生物质支撑的固定床由垂直位于反应区内部的聚氨酯泡沫圆柱体组成。该反应器在间歇曝气（曝气 2 小时，非曝气 1 小时）和回流比 Q(r)/Q=5 的条件下运行。测试了三个不同的操作条件（相 I、相 II 和相 III），分别对应水力停留时间（HRT）为 12h、8h 和 10h。在相 I 中，系统实现了总氮（TN）和化学需氧量（COD）去除率分别为 82%和 89%。在 HRT 为 8h 和 10h 时，TN 去除方面反应器不稳定，平均去除效率分别为 49%和 45%。然而，COD 去除效率仍然很高，相 II 和相 III 的平均值分别为 85%和 88%。根据这些结果，可以得出结论，这种新型反应器配置是从废水中有效去除有机物和氮的一种替代方法。
