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Time-domain induced polarization as a tool to image clogging in treatment wetlands

机译:时域诱导的极化作为湿地堵塞图像堵塞的工具

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摘要

During the last decade, treatment (artificial) wetlands have flourished all over Europe for the treatment of sewages from small communities thanks to their low cost of operation. The clogging of the filter of these wetlands is an issue affecting their efficiency and considered as their main operational problem. The present work shows the results of the application of a geophysical method called time-domain induced polarization. It is used to non-intrusively image, in 3D, the clogging of the gravel filters in a quick and efficient way. Induced polarization characterizes the ability of a porous material to reversibly store electrical charges when submitted to an electrical field. The material property characterizing this ability is called normalized chargeability. A set of laboratory experiments allows to determine an empirical relationship between the normalized chargeability and the weight amount of clogging. Induced polarization measurements have been performed in the field over a treatment wetland to get a 3D reconstructed image (tomography) of the normalized chargeability. From this tomography and the previously defined relationship, we are able to image in 3D the distribution of clogging and where it is concentrated in the filter. We can therefore identify the areas requiring preventive measures to minimize this clogging issue.
机译:在过去十年中,由于业务成本低,欧洲湿地遍布欧洲各地的污水,治疗(人工)沼泽地蓬勃发展。这些湿地的过滤器堵塞是影响其效率并被视为其主要运营问题的问题。本作者表明了一种称为时域感应极化的地球物理方法的应用结果。它用于以3D侵入图像,以快速有效的方式堵塞砾石滤波器。诱导偏振表征多孔材料在提交到电场时可逆地存储电荷的能力。表征这种能力的材料特性称为归一化充电能力。一组实验室实验允许确定归一化带电性和堵塞的重量相比的经验关系。在湿地上已经在现场进行了诱导的极化测量,以获得归一化充电能力的3D重建图像(断层扫描)。从这种断层扫描和先前定义的关系中,我们能够在3D中映像堵塞的分布以及它集中在过滤器中的位置。因此,我们可以确定需要预防措施以最大限度地减少这种堵塞问题的地区。

著录项

  • 来源
    《The Science of the Total Environment》 |2020年第jul1期|138189.1-138189.12|共12页
  • 作者单位

    Water Research Institute (IdRA) University of Barcelona 08028 Barcelona Spain Mineralogy Petrology and Applied Geology Department Faculty of Earth Sciences University of Barcelona 08028 Barcelona Spain;

    Mineralogy Petrology and Applied Geology Department Faculty of Earth Sciences University of Barcelona 08028 Barcelona Spain;

    Universite Grenoble Alpes USMB CNRS EDYTEM 73000 Chambery France;

    Mineralogy Petrology and Applied Geology Department Faculty of Earth Sciences University of Barcelona 08028 Barcelona Spain;

    Water Research Institute (IdRA) University of Barcelona 08028 Barcelona Spain Mineralogy Petrology and Applied Geology Department Faculty of Earth Sciences University of Barcelona 08028 Barcelona Spain;

    Water Research Institute (IdRA) University of Barcelona 08028 Barcelona Spain Mineralogy Petrology and Applied Geology Department Faculty of Earth Sciences University of Barcelona 08028 Barcelona Spain;

    Water Research Institute (IdRA) University of Barcelona 08028 Barcelona Spain Mineralogy Petrology and Applied Geology Department Faculty of Earth Sciences University of Barcelona 08028 Barcelona Spain;

    Water Research Institute (IdRA) University of Barcelona 08028 Barcelona Spain Mineralogy Petrology and Applied Geology Department Faculty of Earth Sciences University of Barcelona 08028 Barcelona Spain;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Chargeability; Treatment wetland; Clogging; Tomography;

    机译:充电能力;治疗湿地;堵塞;断层扫描;

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