Department of Chemical Engineering, School of Engineering, Universidade de Santiago de Compostela, Rúa de Lope Gómez de Marzoa s/n, E-15782, Santiago de Compostela, Galicia, Spain.
Department of Sustainable Development, Environmental Science and Engineering, Royal Institute of Technology (KTH), Teknikringen 10B, SE-10044, Stockholm, Sweden.
J Environ Manage. 2019 Nov 15;250:109538. doi: 10.1016/j.jenvman.2019.109538. Epub 2019 Sep 23.
The partial nitritation-anammox processes implementation in the main line of wastewater treatment plants would lead them closer to the energy autarky. With this purpose, an integrated fixed film activated sludge (IFAS) reactor was operated at pilot scale. Efficient nitrogen removal (72 ± 11%) was achieved for anaerobically pre-treated municipal wastewater at low temperature (21 - 15 °C), with a nitrogen removal rate of 37 ± 3 g N/(m·d) at 15 °C. The ammonium oxidizing bacteria were more abundant in the activated sludge, while anammox bacteria were primarily located in biofilm attached onto the carriers surface. Nitrite oxidizing bacteria (NOB) activity was similar between both fractions and its specific activity decreased more than that of other populations when the operating temperature was reduced. Furthermore, the IFAS operational strategy (aerobic/anoxic periods) allowed an efficient NOB activity suppression inside the reactor, which accounted only for the 10 - 20% of the maximum potential activity.
在废水处理厂的主线上实施部分亚硝化-厌氧氨氧化工艺将使它们更接近能源自给。为此，在中试规模下运行了一个集成固定膜活性污泥（IFAS）反应器。对于在低温（21-15°C）下经厌氧预处理的城市废水，可实现高效的氮去除（72±11%），在 15°C 时氮去除速率为 37±3 g N/（m·d）。氨氧化细菌在活性污泥中更为丰富，而厌氧氨氧化细菌主要位于附着在载体表面的生物膜中。好氧/缺氧周期的 IFAS 操作策略允许在反应器内有效地抑制亚硝酸氧化菌（NOB）的活性，当操作温度降低时，其比其他种群的比活性下降得更多。此外，该操作策略还使得反应器内的 NOB 活性仅占最大潜在活性的 10-20%。
