State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan.
Sci Total Environ. 2020 Jun 1;719:137277. doi: 10.1016/j.scitotenv.2020.137277. Epub 2020 Feb 13.
Anaerobic ammonium oxidation (anammox) is recognized as the most cost-effective process for nitrogen removal from wastewater. In this study, effects of polyethylene plastics, nonwoven fabric, granular activated carbon (GAC) and polyurethane sponge as buoyant carriers were evaluated in lab-scale moving bed biofilm reactors (MBBRs). The overall performance of MBBRs with four types of carriers from priority to inferiority was noticed as, GAC, nonwoven fabrics, polyurethane sponge and polyethylene plastics under the same packing ratio of 20 v% and an average carrier size of 4 × 4 × 4 mm. The hydrophobic surface of GAC could selectively adsorb hydrophobic protein and favor anammox bacteria attachment, which contributed to achieving a total nitrogen removal rate of 0.40 kg-N/(m·d) in 60 days. In conclusion, our results provide compelling evidence for achieving effective anammox process in an MBBR with GAC carriers and would benefit towards accomplishing a stable partial nitritation-anammox process in the future.
厌氧氨氧化（anammox）被认为是从废水中去除氮的最具成本效益的过程。在这项研究中，评估了聚乙烯塑料、无纺纤维、颗粒状活性炭（GAC）和聚氨酯海绵作为浮性载体在实验室规模移动床生物膜反应器（MBBR）中的效果。在相同的 20 v%填充率和平均载体尺寸为 4×4×4 mm 的条件下，四种载体的 MBBR 从优到劣的整体性能依次为：GAC、无纺纤维、聚氨酯海绵和聚乙烯塑料。GAC 的疏水面可选择性地吸附疏水性蛋白质，有利于厌氧氨氧化菌的附着，这有助于在 60 天内实现 0.40 kg-N/（m·d）的总氮去除率。总之，我们的结果为在 MBBR 中使用 GAC 载体实现有效的厌氧氨氧化过程提供了有力的证据，并将有助于未来实现稳定的部分亚硝化-厌氧氨氧化过程。
