曝气方式对人工湿地氮去除效果的影响研究

Effects of Aeration Patterns on Nitrogen Removal in Constructed Wetlands

水平潜流人工湿地强制通风被认为是提高营养盐,特别是氨氮去除效率的重要方法。针对持续曝气能耗高、出水硝氮高等问题,本实验拟采用间歇曝气取代持续曝气。本实验对比研究了持续曝气、间歇曝气(溶解氧浓度>0.5mg/L)和不曝气三种条件下,有机物和氨氮的去除效率。结果表明:间歇曝气是最有效的操作方式,它既提供了好氧和缺氧的交替环境,又降低了能源消耗。COD和氨氮去除率分别达到67%和99%,总氮最大去除率可达79%。

Forced aeration of horizontal subsurface flow constructed wetlands is considered to be a good way for improving nutrientremoval, especially ammonia. The purpose of this study is to remove ammonia effectively and reduce energy, based on efficiencyof continuous and intermittent aeration. In this study, three aeration systems were used： continuous aeration, intermittent aeration（dissolved oxygen concentration greater than 0.5 mg/L） and a contrast test. The experiments results showed that intermittentaeration was the most effective method. Aerobic and anoxic environment was provided in this process, simultaneously, the energyconsumption was reduced. The chemical oxygen demand （ COD）, and ammonia nitrogen removal rate were 66% and 99%,respectively, and maximal total nitrogen （TN） removal can reach 79%.