氧调控强化人工湿地脱氮性能的研究进展

Research Progress on Enhancing Nitrogen Removal Performance of Constructed Wetland by Oxygen Regulation

对人工湿地中溶解氧的主要来源进行了描述,主要包括进水携氧、植物供氧和大气复氧等;探讨了表面流、水平潜流、垂直流人工湿地各自的氧分布特征;重点论述了现有人工湿地氧调控策略及其优缺点,包括机械曝气氧调控、改善进出水方式氧调控、强化自然通风氧调控、优化湿地结构氧调控、改良基质氧调控和优化动植物氧调控;对今后人工湿地氧调控的研究方向进行了展望,建议从曝气方式、大气复氧、动植物优化以及自养型脱氮工艺等方面加强湿地氧调控,从而进一步提高人工湿地的脱氮性能。

In this paper,the main sources of dissolved oxygen in constructed wetlands were described,mainly including inlet water oxygen,plant oxygen,and atmospheric reoxygenation,etc.The oxygen distribution characteristics of surface flow,horizontal submerged flow and vertical flow constructed wetlands were discussed.The advantages and disadvantages of existing oxygen control strategies for constructed wetlands were emphasized including mechanical aeration oxygen control,improved inlet and outlet water oxygen control,enhanced natural ventilation oxygen control,and optimized wetland structure oxygen.The future research directions of oxygen regulation in constructed wetlands were discussed,and it was suggested that the oxygen regulation of wetlands should be strengthened from the aspects of aeration method,atmospheric reoxygenation,optimization of plants and animals,and autotrophic denitrification process,so as to further improve the denitrification performance of constructed wetlands.