潜流人工湿地填料筛选及其对小城镇微污染水的修复性能评价

为了选择适合小城镇潜流人工湿地的填料,选取小城镇较为常见的材料(废砖、卵石、碎石),结合物化性质,研究25℃下填料对磷的吸附效果,并分析了填料种类对野外潜流人工湿地运行的影响。结果表明:(1)25℃时,3种填料对磷的吸附量随着溶液中初始磷浓度的增加而增加,吸附能力依次为废砖>碎石>卵石;(2)野外潜流人工湿地运行过程中,随HRT的延长,组合填料湿地WL1和废砖填料WL2湿地对总磷的净化效果有所提高,且WL2湿地对总磷的去除效果略优于WL1。因此,可以选择废砖作为小城镇潜流人工湿地系统的填料。

The Selection of Substrates for Subsurface Flow Constructed Wetlands and the Remedy for Slightly Polluted Water in Small-Sized Towns

In order to select suitable substrates for subsurface flow constructed wetlands(CWs) in small-sized towns,common materials(waste bricks,gravel and crushed stone) were used to study their phosphorus adsorption performance.The tests showed that the uptake by substrates would rise as the initial phosphorus concentration increased,and the phosphorus sorption ability of waste bricks was the highest and gravel was the lowest at a temperature of 25℃.The performance of CWs indicated that the total phosphorus removals by WL1 and WL2 wetlands with composite substrate and waste bricks,respectively,would be inclined to enhance along with the prolonged hydraulic retention time(HRT) whilst the latter one showed somewhat superior efficiency.As a result, waste bricks were adaptable as a substrate to subsurface flow constructed wetlands in small-sized towns.