ABSTRACT

This research aimed the performance evaluation of a structured bed reactor with different cycles of Intermittent Aeration (IA)(SBRRIA) in the municipal sewage treatment and the verification of the effect of IA cycles on the total nitrogen (TN) removal and organic matter (COD). Three IA cycles were evaluated: phase I (4 h AE (aeration on) – 2 h NA (aeration off)); II (2 h AE–1 h NA) and III (2 h AE–2 h NA), with Hydraulic Retention Time of 16 h. The best nitrogen removal was obtained during phase II, with the lowest non-aeration time: efficiency of nitrification, denitrification, TN and COD removal of 80 ± 15%, 82 ± 12%, 67 ± 6% and 94 ± 7%, respectively. The mean cell residence time was 19, 26 and 33 d in phases I, II and III, respectively. The statistical analysis applied to the AE/NA profiles showed that the time of AE and NA in the cycles did not influence nitrogen and organic matter removal. Thus, this indicates the recirculation and the gradient formed in the support material facilitate the process of Simultaneous Nitrification and Denitrification. The lowest concentration of nitrifying and denitrifying microorganisms was obtained in effluent and sludge at the end of phase III. From the TP (Total Proteins)/TPS (Total Polysaccharides) ratio obtained (0.8 ± 0.1, 1.3 ± 0.1 e 1.5 ± 0.1 in phases I, II and III), it was possible to conclude that the biofilm in phase I was more porous, with a thin layer if compared to that in phase II and III.

摘要

本研究旨在对不同周期间歇曝气（IA）（SBRRIA）结构床反应器在城市污水处理中的性能进行评估，并验证IA循环对总氮（TN）去除和有机物（COD）的影响。 ）。评估了三个 IA 周期：第一阶段（4 小时 AE（充气）– 2 小时 NA（充气关闭））；II (2 h AE–1 h NA) 和 III (2 h AE–2 h NA)，水力停留时间为 16 h。第二阶段的脱氮效果最好，非曝气时间最短：硝化效率、反硝化效率、TN 和 COD 去除率分别为 80 ± 15%、82 ± 12%、67 ± 6% 和 94 ± 7% . I、II 和 III 期的平均细胞停留时间分别为 19、26 和 33 天。应用于 AE/NA 曲线的统计分析表明，循环中 AE 和 NA 的时间不影响氮和有机物的去除。因此，这表明在支撑材料中形成的再循环和梯度促进了同时硝化和反硝化过程。在第三阶段结束时，出水和污泥中硝化和反硝化微生物的浓度最低。从获得的 TP（总蛋白质）/TPS（总多糖）比率（I、II 和 III 阶段为 0.8 ± 0.1、1.3 ± 0.1 e 1.5 ± 0.1）可以得出结论，I 阶段的生物膜多孔性更强，如果与阶段 II 和 III 相比，则具有薄层。这表明在支撑材料中形成的再循环和梯度促进了同时硝化和反硝化过程。在第三阶段结束时，出水和污泥中硝化和反硝化微生物的浓度最低。从获得的 TP（总蛋白质）/TPS（总多糖）比率（I、II 和 III 阶段为 0.8 ± 0.1、1.3 ± 0.1 e 1.5 ± 0.1）可以得出结论，I 阶段的生物膜多孔性更强，如果与阶段 II 和 III 相比，则具有薄层。这表明在支撑材料中形成的再循环和梯度促进了同时硝化和反硝化过程。在第三阶段结束时，出水和污泥中硝化和反硝化微生物的浓度最低。从获得的 TP（总蛋白质）/TPS（总多糖）比率（I、II 和 III 阶段为 0.8 ± 0.1、1.3 ± 0.1 e 1.5 ± 0.1）可以得出结论，I 阶段的生物膜多孔性更强，如果与阶段 II 和 III 相比，则具有薄层。