Hydraulic and Design Parameters in Full-Scale Constructed Wetlands and Treatment Units: Six Case Studies
Hydraulic and Design Parameters in Full-Scale Constructed Wetlands and Treatment Units: Six Case Studies
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DOI：
10.1007/s40710-018-0313-8
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发表时间：
2018-11-01
影响因子：
4.4
通讯作者：
Pearson, Jonathan M.
中科院分区：
文献类型：
--
作者：
Ioannidou, Vasiliki G.;Pearson, Jonathan M.
池塘和人工湿地（CW）处理系统的效率受到内部流体动力学和水与水生植被之间的混合相互作用的影响。为了有助于目前的知识如何新兴的真实的植被影响溶质混合，以及形状和大小的影响是什么混合特性，这些物理过程和相互作用的理解和量化。本文介绍了2015-2016年期间在英国六个全尺寸系统中进行的示踪剂测试结果，这些系统处于不同的流态、操作深度、形状和尺寸以及入口/出口配置。其目的是量化的水力性能和混合特性的处理单元，并调查的混合过程中的大小和形状的影响。出口配置，流入条件，和内部特征之间的六个不同的处理单元的相对比较表明，停留时间的变化高达3倍。这项研究的一个关键结果是，与深度相比，宽度是单位效率的更重要的尺寸。结果强调了在全尺寸单元中调查流体动力学和流动物理学的重要性，以提高处理效率和水质模型的预测。
The efficiency of pond and constructed wetland (CW) treatment systems is influenced by the internal hydrodynamics and mixing interactions between water and aquatic vegetation. In order to contribute to current knowledge of how emergent real vegetation affects solute mixing, and on what the shape and size effects are on the mixing characteristics, an understanding and quantification of those physical processes and interactions were made. This paper presents results from tracer tests conducted during 2015-2016 in six full-scale systems in the UK under different flow regimes, operational depths, shapes and sizes, and inlet/outlet configurations. The aim was to quantify the hydraulic performance and mixing characteristics of the treatment units, and to investigate the effect of size and shape on the mixing processes. Relative comparison of outlet configuration, inflow conditions, and internal features between the six different treatment units showed variations in residence times of up to a factor of 3. A key outcome of this study was that the width is a more important dimension for the efficiency of the unit compared to the depth. Results underlined the importance of investigating hydrodynamics and physics of flow in full-size units to enhance treatment efficiency and predictions of water quality models.