Since low oxygen supplement rate in subsurface flow constructed wetland was a critical obstacle to bacterial nitrification process, a novel tidal unsaturated constructed wetland (CW_TU) realized by the siphon effluent pipe was proposed in this study to overcome the problem and strengthen the pollutants removal. Four CW_TUs were constructed with different ratios of tidal unsaturated section to constant saturated section (80: 0, 60: 20, 50: 30 and 30: 50). Results showed that the NH₄⁺-N removal efficiency increased with the increasing ratio of tidal unsaturated section to constant saturated section. Among which, CW_TU1 significantly enhanced the oxygen supplement from air to wastewater, and the subsequent removal efficiencies of NH₄⁺-N (51.04 ± 6.99 % in CW_TU1), and COD (89.90 ± 2.10 % in CW_TU1) compared with traditional wetland (NH₄⁺-N 12.96 ± 5.26 %, COD 65.30 ± 10.08 %) (p < 0.05), increasing the removal rate of NH₄⁺-N by approximately 3 times. According to the dynamic changes of pollutant distribution in CW_TU, the carbon source shortage in the constantly saturated section could be the reason for the poor TN removal, which could be modified by adding slow-released carbon substrate to realize the thorough removal of nitrogen pollutant in CW_TUs.

由于地下流人工湿地的低氧补给是细菌硝化过程的关键障碍，因此提出了一种通过虹吸污水管实现的新型潮汐非饱和人工湿地（CW _TU），以解决该问题并加强污染物的去除。构造了四个CW _TU，潮汐不饱和部分与恒定饱和部分的比率不同（80：0、60：20、50：30和30:50）。结果表明，NH ₄ ⁺ -N去除效率随潮汐不饱和部分与恒定饱和部分的比值增加而增加。其中，CW _TU1与传统湿地（NH ₄ ⁺）相比，NH ₄ ⁺ -N（CW _TU1中为51.04±6.99％）和COD（CW _TU1中为89.90±2.10％）的去除效率显着提高了空气和废水中的氧气补充量。-N 12.96±5.26％，COD 65.30±10.08％）（p <0.05），将NH ₄ ⁺ -N的去除率提高约3倍。根据CW _TU中污染物分布的动态变化恒定饱和区碳源的短缺可能是总氮去除率不高的原因，可以通过添加缓释碳底物来实现，以彻底去除CW _TUs中的氮污染物。