Department of Civil and Environmental Engineering, University of Michigan, 1351 Beal Avenue, Ann Arbor, MI 48109, USA E-mail:
Water Sci Technol. 2022 Oct;86(8):1887-1903. doi: 10.2166/wst.2022.315.
Partial nitritation anammox (PNA) membrane-aerated biofilm reactors (MABRs) can be used in mainstream nitrogen removal to help facilities reduce their energy consumption. Previous PNA MABR research has not investigated the impacts of staging, i.e. arraying MABRs in series, on their nitrogen removal performance, operation, and ability to suppress nitrite oxidizing bacteria. In this paper, a mathematical model simulated PNA MABR performance at different influent total ammonia concentrations and loadings. A design methodology for staging PNA MABRs was created and found that the amount of membrane surface area is dependent upon the total ammonia-nitrogen concentration and loading, and the air loading to the membrane must be proportional to the total ammonia-nitrogen loading to maximize the total inorganic nitrogen (TIN) removal rate. This led to approximately equal-sized stages that each had a TIN removal percentage of 71% of the influent total ammonia nitrogen. Staging a treatment train resulted in 9.8% larger total ammonia and 9.3% larger total nitrogen removal rates when compared with an un-staged reactor. The un-staged reactor also was not able to produce an effluent total ammonia concentration below 5 mg N/L which would be necessary for many facilities' permits.
部分亚硝化-厌氧氨氧化（PNA）膜曝气生物膜反应器（MABRs）可用于主流脱氮，帮助设施降低能耗。以往的 PNA MABR 研究尚未考察分级（即串联排列 MABR）对其脱氮性能、运行和抑制亚硝酸盐氧化菌能力的影响。本文使用数学模型模拟了不同进水总氨浓度和负荷下的 PNA MABR 性能。创建了一种设计 PNA MABR 分级的方法，发现膜表面积的数量取决于总氨氮浓度和负荷，并且必须使空气负荷与总氨氮负荷成比例，以最大程度地提高总无机氮（TIN）去除率。这导致每个阶段的 TIN 去除率都约为进水总氨氮的 71%，阶段大小大致相同。与未分级的反应器相比，分阶段处理的总氨氮和总氮去除率分别提高了 9.8%和 9.3%。未分级的反应器也无法产生许多设施许可证所需的低于 5mg/L 的出水总氨浓度。
