跨越河道宽度、串联布置的浮式处理湿地的流量分布和质量去除

IF 2.4 3区 环境科学与生态学 Q2 ENGINEERING, CIVIL Journal of Hydro-environment Research Pub Date : 2022-09-01 DOI:10.1016/j.jher.2022.07.001
Taís N. Yamasaki , Christopher Walker , Johannes G. Janzen , Heidi Nepf
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引用次数: 2

摘要

浮动处理湿地(FTWs)利用植物的根来改善水质。这些植物由部署在水面上的浮力结构支撑。根在结构下形成一个多孔区,通过过滤、吸收和吸收去除悬浮中的污染物。本文采用CFD模拟方法,对跨通道宽度串联布置的FTWs进行建模,研究了根长和FTWs间距对水流分布和质量去除的影响。根区被模拟为多孔介质,去除用一阶衰变计算,并对去除常数范围进行了测试。较长的根系增加了根区的反应体积,从而增加了污染物流入FTWs的比例。增加FTW之间的距离可以使上游FTW下面的水之间的混合更大。这增加了进入每个FTW的浓度,从而提高了每个FTW的质量去除。然而,FTWs之间的距离越大,通道中FTWs的数量就会减少,反应体积就会减小。在混合和反应体积之间的权衡中,反应体积更为重要,因此随着根的延长和FTW单位的增加(间隙距离的缩短),通道中的总去除量增加。然而,完全消除间隙是有害的,因为串联的FTW比相同体积的连续FTW减少了更多的质量。本研究提出了两个串联ftw的设计建议。首先,如果用于构建fts的资源不受限制,但通道长度受到限制,则最好优先考虑更高的反应体积(更短的间隙距离),以实现每个通道长度的最大移除。其次,如果FTW的资源有限,但通道长度没有限制,则最好将FTW放置在较长的间隙距离上,最好足够长,以便在FTW之间的整个深度上进行混合,因为这将实现每个FTW的最大去除。
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Flow distribution and mass removal in floating treatment wetlands arranged in series and spanning the channel width

Floating treatment wetlands (FTWs) use plants’ roots for water quality improvement. The plants are supported by a buoyant structure deployed at the water surface. The roots form a porous zone beneath the structure and remove pollutants carried in suspension through filtering, absorption and uptake. This paper used CFD simulation to model FTWs arranged in series and spanning the channel width and to study the effects of root length and spacing between FTWs on flow distribution and mass removal. The root zone was modelled as a porous media, and removal was computed using first-order decay, for which a range of removal constants was tested. Longer roots increased the reactive volume of the root zone, which increased the fraction of pollutant inflow entering the FTWs. Increasing the distance between FTWs allowed greater mixing between water that went through and beneath the upstream FTW. This increased the concentration entering each FTW, which enhanced mass removal per FTW. However, a larger distance between FTWs reduced the number of FTWs in the channel, reducing the reactive volume. In the tradeoff between mixing and reactive volume, the reactive volume was more important, such that total removal in the channel increased with longer roots and more units of FTW (shorter gap distance). However, removing the gap entirely was detrimental, as FTWs in series removed more mass than a continuous FTW of same volume. This study points to two design recommendations for FTWs in series. First, if resources for building FTWs are not limiting, but the channel length is, it is preferable to prioritize higher reactive volume (shorter gap distance) to achieve maximum removal per channel length. Second, if resources for FTWs are limiting, but channel length is not, it is better to place the FTWs with a longer gap distance, preferably along enough to allow mixing over the full depth between FTWs, as this will achieve maximum removal per FTW.

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来源期刊
Journal of Hydro-environment Research
Journal of Hydro-environment Research ENGINEERING, CIVIL-ENVIRONMENTAL SCIENCES
CiteScore
5.80
自引率
0.00%
发文量
34
审稿时长
98 days
期刊介绍: The journal aims to provide an international platform for the dissemination of research and engineering applications related to water and hydraulic problems in the Asia-Pacific region. The journal provides a wide distribution at affordable subscription rate, as well as a rapid reviewing and publication time. The journal particularly encourages papers from young researchers. Papers that require extensive language editing, qualify for editorial assistance with American Journal Experts, a Language Editing Company that Elsevier recommends. Authors submitting to this journal are entitled to a 10% discount.
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