Uri-Carreño Nerea, Nielsen Per H, Gernaey Krist V, Flores-Alsina Xavier
Vandcenter Syd A/S, Vandværksvej 7, Odense 5000, Denmark; Process and Systems Engineering Center (PROSYS), Department of Chemical and Biochemical Engineering, Technical University of Denmark, Søltofts Plads 228A, Kgs. Lyngby 2800, Denmark.
Vandcenter Syd A/S, Vandværksvej 7, Odense 5000, Denmark.
Sci Total Environ. 2021 Jul 20;779:146366. doi: 10.1016/j.scitotenv.2021.146366. Epub 2021 Mar 10.
Membrane-aerated biofilm reactor (MABR) technology is an exciting alternative to conventional activated sludge, with promising results in bench and pilot-scale systems. Nevertheless, there is still a lack of long-term and full-scale data under different operational conditions. This study aims to report the performance of a full-scale hybrid MABR located in the North of Europe. Influent, effluent, and exhaust data were collected for 1 year (September 2019 to September 2020) using online sensors/gas-analyzers and off-line laboratory analysis. Next, oxygen transfer rate (OTR), oxygen transfer efficiency (OTE), and nitrification rates (NR) were quantified as process indicators. Finally, multivariate methods were used to find patterns among monitored variables. Observations revealed that lower airflows achieved higher OTE at the same values of OTR and OTR was strongly correlated to ammonia/um concentration in the MABR tank (NH). The dynamics between oxygen concentration in the exhaust (O) and NH indicated that a nitrifying biofilm was established within 3 weeks. Average NR were calculated using four different methods and ranged between 1 and 2 g N md. Principal component analysis (PCA) explained 81.4% of the sample variance with the first three components and cluster analysis (CA) divided the yearly data into five distinctive periods. Hence, it was possible to identify typical Nordic episodes with high frequency of heavy rain, low temperature, and high variations in pollution load. The study concludes that nitrification capacity obtained with MABR is robust during cold weather conditions, and its volumetric value is comparable to other well-established biofilm-based technologies. Moreover, the aeration efficiency (AE) obtained in this study, 5.8 kg O kW h, would suppose an average reduction in energy consumption of 55% compared to fine pore diffused aeration and 74% to the existing surface aeration at the facility.
膜曝气生物膜反应器（MABR）技术是传统活性污泥法的一种令人兴奋的替代方案，在实验室规模和中试规模系统中取得了令人期待的结果。然而，在不同运行条件下仍缺乏长期和全规模数据。本研究旨在报告位于北欧的一座全规模混合MABR的性能。使用在线传感器/气体分析仪和离线实验室分析，收集了1年（2019年9月至2020年9月）的进水、出水和尾气数据。接下来，将氧传递速率（OTR）、氧传递效率（OTE）和硝化速率（NR）量化为过程指标。最后，使用多变量方法来寻找监测变量之间的模式。观察结果表明，在相同的OTR值下，较低的气流实现了更高的OTE，并且OTR与MABR池中氨/铵浓度（NH）密切相关。尾气中氧浓度（O）和NH之间的动态关系表明，在3周内建立了硝化生物膜。使用四种不同方法计算的平均NR在1至2 g N m⁻³ d⁻¹之间。主成分分析（PCA）用前三个成分解释了81.4%的样本方差，聚类分析（CA）将年度数据分为五个不同时期。因此，有可能识别出暴雨频率高、温度低且污染负荷变化大的典型北欧事件。该研究得出结论，MABR在寒冷天气条件下获得的硝化能力很强，其体积值与其他成熟的基于生物膜的技术相当。此外，本研究中获得的曝气效率（AE）为5.8 kg O kW⁻¹ h⁻¹，与微孔曝气相比，平均能耗将降低55%，与该设施现有的表面曝气相比将降低74%。
