垂直流人工湿地水流规律研究

Hydraulic behaviors of vertical flow constructed wetlands

通过示踪剂实验,以流量加权时间为参变量,绘制湿地无因次停留时间分布曲线,同时引入水力学性能参数,评估湿地的水力效率,以研究植物、进水策略对垂直流人工湿地水力学的影响.结果显示:植物及较高的进水流速有利于提高系统的水力效率,综合水力性能参数分别提高11.4%和30.2%.进水流速相同时连续和间歇进水方式对系统水力效率综合影响效果无显著差异;日水力负荷相同时,间歇进水方式可获得较高的进水流速,从而获得较高的水力效率.

To understand the influences of plants and feeding strategies on hydraulic behaviors of vertical flow constructed wetlands （VFCW）,the residence time distribution curves were represented as the functions of the weighted flow time by means of tracer experiments,and the hydraulic efficiency were introduced.Results indicate that plants and higher flow rate are helpful to improve hydraulic efficiency of the VFCW,which the synthesized parameter of hydraulic efficiency increased by 11.4% and 30.2% respectively.Hydraulic efficiency compared between continuous and intermittent feeding has no distinctively difference when the same flow rate was employed.Otherwise intermittent feeding under the same hydraulic loading can obtain higher flow rate to improve hydraulic efficiency.