2018
DOI: 10.3390/w10101334
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Quantitative Detection of Clogging in Horizontal Subsurface Flow Constructed Wetland Using the Resistivity Method

Abstract: Substrate clogging seriously affects the lifetime and treatment performance of subsurface flow constructed wetlands (SSF CWs), and the quantitative detection of clogging is the key challenge in the management of substrate clogging. This paper explores the feasibility of the resistivity method to detect the clogging degree of an SSF CW. The clogged substrate was found to have a high water-holding capacity, which led to low apparent resistivity in the draining phase. On the basis of the resistivity characteristi… Show more

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Cited by 12 publications
(9 citation statements)
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References 30 publications
(45 reference statements)
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“…The geo-electrical technique used here for investigation is that of electric trails, based on series of apparent electrical resistance measurements, in order to study superficial depth properties of the subsurface flow treatment wetlands. The resistivity distribution of the subsurface flow zone is influenced by many parameters such as the nature and structure of the solid fraction, the water content, and the liquid-phase electrical conductivity (Liu et al 2018a ). In the electrical resistivity method, multiple measurements of the medium transfer resistance using a four-electrode array allow to reconstruct the resistivity distribution of subsurface wetland beds (Binley and Kemna 2005 ).…”
Section: Resultsmentioning
confidence: 99%
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“…The geo-electrical technique used here for investigation is that of electric trails, based on series of apparent electrical resistance measurements, in order to study superficial depth properties of the subsurface flow treatment wetlands. The resistivity distribution of the subsurface flow zone is influenced by many parameters such as the nature and structure of the solid fraction, the water content, and the liquid-phase electrical conductivity (Liu et al 2018a ). In the electrical resistivity method, multiple measurements of the medium transfer resistance using a four-electrode array allow to reconstruct the resistivity distribution of subsurface wetland beds (Binley and Kemna 2005 ).…”
Section: Resultsmentioning
confidence: 99%
“…The vertical electrical survey was performed in this study to gain knowledge about the internal structure of the treatment wetlands (HSF-CW1, HSF-CW2), with the aim of detecting any operational anomalies commonly reported for reed beds such as clogging, lateral losses or short-circuited flow, and dead zones that ineluctably influence the wetlands’ performance. Based on the lab-scale experiments conducted by Liu et al ( 2018a ), the feasibility of the resistivity method was further examined in the present work on full-scale HSF-CW units for investigating the superficial depth properties of reed beds, especially for in situ detection of clogging. In this case study, we first explored the feasibility of the electric trail method in the field as a simple and suitable technique to monitoring wetlands, based on series of apparent electrical resistivity measurements for a rapid on-site survey.…”
Section: Methodsmentioning
confidence: 99%
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