Excessive nitrogen emission is a common problem in the secondary effluents of rural wastewater treatment facilities. Nitrogen could be removed by constructed wetlands and ecological floating beds, but these techniques have low purification capacity in practice. Here, a novel tubular reactor-enhanced ecological floating bed was developed to enhance nitrogen removal of secondary effluents. We tested the feasibility of this system during a long-term operation. Results show that our system achieves a removal efficiency of secondary effluent N of 82.2% for 30 days after start-up and then maintains this efficiency for an additional 220 days. Dissolved oxygen was reduced from 2.92 to 0.23 mg L⁻¹, and the COD_Cr/TN (C/N) ratio increased from 2.6 to 13.1 along the reactor channel. This finding is explained by the synergy between the unique tubular reactor configuration and the mixed filler: palm fiber and bagasse. This environment enhances the spatial distribution of nitrifiers and denitrifiers along the channel, which was further demonstrated by scanning electron microscopy and high-throughput sequencing.

氮的过量排放是农村污水处理设施二次排放中的普遍问题。人工湿地和生态浮床可以去除氮，但是这些技术在实践中净化能力很低。在这里，开发了一种新型的管式反应器增强型生态浮床，以提高对二级废水的氮去除率。我们在长期运行中测试了该系统的可行性。结果表明，我们的系统在启动后的30天内达到了82.2％的二级废水N去除效率，然后又保持了220天的去除效率。溶解氧从2.92降至0.23 mg L ^-1，COD _Cr降低沿反应器通道的/ TN（C / N）比从2.6增加到13.1。独特的管式反应器配置与混合填料（棕榈纤维和甘蔗渣）之间的协同作用解释了这一发现。这种环境增强了硝化剂和反硝化剂沿通道的空间分布，这通过扫描电子显微镜和高通量测序得到了进一步证明。