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The effects of substrate type, HRT and reed on the lead removal in horizontal subsurface-flow constructed wetland

机译：基质类型，HRT和芦苇对水平地下流人工湿地中铅去除的影响

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In this research, between June 2013 and October 2013, the effects of three substrate types, hydraulic retention time (HRT), and Phragmites (common reed) on the removal of lead in horizontal subsurface-flow constructed wetlands (CWs) were investigated in the Islamic Republic of Iran. The results showed that the more HRT increased, the more removal efficiency (RE) increased, so that there was a significant difference between RE in sand substrate and retention times of 1, 3, and 5d (p<0.05), while no significant difference was observed between 5 and 10d retention time at 5% level. Moreover, there was a significant difference between retention times of 1 and 3d in two fine- and medium-gravel substrates (p<0.05), but no significant difference was observed between retention times of 3, 5, and 10d at 5% level. Therefore, the best HRT for sand, gravel, and medium-gravel substrate was recommended 5, 3, and 3d, respectively, with the maximum efficiency of 88.51, 81.53, and 80.35%. The analysis results of substrate type also showed that sand substrate had higher efficiency than the other two substrates. Moreover, the results indicated the root of reed is highly capable of assimilating and accumulating influent lead and plays an important role on the lead removal in horizontal subsurface-flow CW.
机译：在这项研究中，2013年6月至2013年10月，研究了三种基质类型，水力停留时间（HRT）和芦苇（普通芦苇）对水平地下流人工湿地（CW）中铅去除的影响。伊朗伊斯兰共和国。结果表明，HRT增加得越多，去除效率（RE）越高，因此砂土中RE与保留时间分别为1、3和5d有显着差异（p <0.05），而无显着差异。在5％至10d的保留时间之间观察到浓度为5％。此外，在两个细和中度砾石基质中，保留时间1和3d之间存在显着差异（p <0.05），但是在5％浓度下，保留时间3、5和10d之间没有观察到显着差异。因此，分别建议在砂砾，砾石和中砾石基质上使用最佳HRT，分别为5、3和3d，其最大效率为88.51、81.53和80.35％。基质类型的分析结果还表明，砂基质比其他两种基质具有更高的效率。此外，结果表明，芦苇的根部具有很高的吸收和积累进水铅的能力，并且在水平地下流连续波中去除铅中起着重要作用。

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