新型超吸附植被垂直流人工湿地水力学特性

Hydraulic characteristics of vertical flow constructed wetland planted with new vegetation of hyperaccumulators

选取短毛蓼、水蓼及鸭跖草3种锰超吸附新型湿地植被建立7种不同植物组合的垂直流人工湿地（VFCW）系统,通过示踪剂实验得到不同工况下各系统的水流停留时间分布及水力学特征参数,得出水流在VFCW系统中的流态是介于活塞流与全混流之间的流动型式,植物系统根系的延伸有利于水流流态接近理想推流;各系统的水力学停留时间随水力负荷（HL）的增加而降低,植物混合时的停留时间较单一植物运行时间缩短;水力负荷的变化对有植物系统水流扩散的影响明显,对无植物系统的影响不大;测定各系统中植物的生物量及含水量,得出单一植物系统的水力停留时间与生物量、含水量呈正相关关系.

Three new species of manganese hyperaccumulation plants：polygonum pubescens blume,polygonum hydropiper and commelina communis are selected to construct seven different combinations plants of vertical flow constructed wetlands system（VFCW）.The retention time distribution（RTD）and hydraulic characteristic parameters are obtained by tracer experiment;the actual flow pattern is between plug flow and continuous stirred flow;hydraulic retention time of VFCW system is shortened with the increase of the hydraulic load（HL）;the retention time of the combination plants is shorter than single plant system,which is favorable to purifying function.The change of hydraulic load has a large effect on the diffusion process of water in plant system,and less effect on the system without plants.The plant root is found favorable for the flow pattern to approximate the ideal plug flow.Moreover,biomass and water content of plant in every VFCW system are determinated;and it is found that the hydraulic retention time has a positive correlation with biomass and water content in a single plant VFCW system.