基于增氧的潜流人工湿地强化措施研究进展

Research Progress on Environment and Protection Based on Strengthening Strategies of Oxygen Enriched Subsurface Constructed Wetlands

指出了人工湿地是一种行之有效的农村污水分散式处理措施,但氧的缺乏在一定程度上制约了人工湿地的处理效率以及应用范围。在研究大量文献的基础上,归纳了人工湿地的氧来源及各来源的贡献水平,并综述了近年来国内外为改善湿地内部氧环境,对湿地结构上及运行模式上进行的改良,并从复氧原理、复氧能力、存在的问题等角度对各强化措施进行了介绍:主要强化措施有跌水复氧、通气管复氧、人工曝气、变浸润线运行与间歇进水方式。目前结构上的改良存在复氧能力有限、增加管理运行费用、增加施工难度等问题;运行模式的改变能在不过分增加额外投入的前提下得到良好的复氧效果并提升湿地处理效率,也可与结构上的改良共同使用。但是间歇进水的脉冲频率对于不同污染物的去除的影响还缺乏深入的定量研究。

Constructed wetland is an effective distributed processing measure for the rural sewage ,but the lack of oxygen limits the pollutant removal efficiency and the application range of constructed wetlands to some extent .Based on extensive review of literature , the article concludes constructed wetland＇s main sources of oxygen and the contribution level of each source . In addition , the article reviews the improvement of wetland structure and operational mode which aims to perfect the wetland＇s inside oxygen environment ,and introduces the strengthening strategies through several aspects ,including reoxygenation mechanisms ,reoxygenation capacity and the existing defects of the configuration innovations ,etc/the main strengthening strategies include which includes water -dropping reoxygenation ,breather pipe reoxygenation ,artificial aeration ,modified saturation line operation and batch influent method . The existing configuration innovations have some major disadvantages , such as limited reoxygenation ability ,adding extra management and operation costs ,increasing difficulties for construction;the change of operating mode can gain the good effect of reoxygenation ability and improve wetland treatment efficiency with limited extra investment .However ,the impact of batch injection＇s impulse frequency on the removal of pollutant needs further quantitative research .