Experiment research on physical clogging mechanism in the porous media and its impact on permeability

Tang, Yao; Yao, Xinyu; Zhou, Yongchao; Zhu, David Z.; Zhang, Yiping; Zhang, Tuqiao; Yu, Ping

doi:10.1007/s10035-020-1001-8

Cited by 32 publications

(6 citation statements)

References 48 publications

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“…First, it was necessary to evaluate the validity of the test, checking that the tracer was recovered nearly in its entirety at the wetland outlet. To achieve this, the relative tracer mass recovery (%) was calculated as M out M in × 100 (5) where:…”

Section: Tracer Testsmentioning

confidence: 99%

“…The K s value, which is largest at start-up, will decrease with time as plant roots, microbial biofilms, and chemical precipitates gradually occupy spaces. While there have been numerous studies on the rate and development of clogging and, consequently, on the changes to the hydraulic characteristics of HSTWs, research has not acquired a clear understanding of the processes [5]. In addition to techniques that measure the properties of clog matter (elucidating the nature and the degree of clogging) [6,7] and tomography (allowing for the production of a 3D image of the distribution of the clogging and its concentration in the filter) [8], all the other approaches are based on the evaluation of HSTW hydraulic behavior.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Different Methods to Assess the Hydraulic Behavior in Horizontal Treatment Wetlands

Licciardello

Sacco

Barbagallo

et al. 2020

Water

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While there have been numerous studies on the rate and development of clogging in horizontal subsurface treatment wetlands (HSTWs) and, consequently, the effects on its hydraulic characteristics, research has not shown a clear understanding of the processes. The existing methods for measuring the impact of clogging provide limited information on the extension and degree of the phenomenon. This study aimed to evaluate the capacity of various measurement techniques to assess the degree and variation in space and time of clogging in HSTWs. Hydraulic conductivity at saturation (Ks) measurements were conducted using a newly implemented scheme, the drainage equation method, and traditional tracer tests, which were carried out in a full-scale HSTW system, located in Sicily, Italy, during 2019. After five years of operation, the results highlighted a severe decrease in Ks (<1000 m day−1) in the inlet zone (despite the fact that the filter gravel was replaced in 2017), a very high reduction of Ks along the central path inside the bed, a nonuniform flow through the HSTW, the presence of stagnant zones, and a reduction of the porosity of the bed gravel. Nonetheless, the mean values of the physical–chemical and bacteriological parameters at the hybrid treatment wetland (hybrid TW) outlet indicated that the partial clogging had no significant effect on the quality of the discharged water. Moreover, the results obtained using the different measurement techniques (in terms of both the Ks values and the flow distribution inside the bed) were consistent with each other and with results obtained previously for the same system. Finally, the most efficient combination of methods to assess clogging in HSTWs was identified.

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Section: Tracer Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of Different Methods to Assess the Hydraulic Behavior in Horizontal Treatment Wetlands

Licciardello

Sacco

Barbagallo

et al. 2020

Water

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“…In the context of stormwater filtration, several authors have focused on modeling mechanical clogging, e.g. Siriwardene et al (2007); Wang et al (2012); Tang et al (2020). However, the prediction of filter clogging is complex and depends on a set of parameters; therefore, different clogging phenomena (deep bed filtration and surface filtration) are observed within different experiments.…”

Section: Prediction Of Filter Cloggingmentioning

confidence: 99%

Design-oriented evaluation of the hydrodynamics in a full-scale combined filter-lamella separator for urban stormwater treatment

Stricker

Littfinski

Heinz

et al. 2022

Water Science and Technology

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The development of compact treatment devices with high removal efficiencies and low space requirements is a key objective of urban stormwater treatment. Thus, many devices utilize a combination of sedimentation and upward flow filtration in a single system. This study, for the first time, evaluates the flow field inside a combined filter-lamella separator via computational fluid dynamics. Herein, three objectives are investigated: (i) the flow field for different structural configurations, (ii) the distribution of particulate matter along the filter bed and (iii) the dynamic clogging in discrete filter zones, which is addressed by a clogging model derived from literature data. The results indicate that a direct combination of a filtration stage with a lamella separator promotes a uniform flow distribution. The distribution of particulate matter along the filter bed varies with configuration and particle size. Clogging, induced by particles in the spectrum ≤63 μm, creates gradients of hydraulic conductivity along the filter bed. After treating about half of Germany's annual runoff-efficient precipitation at a rainfall intensity of 5 L/(s·ha), the filtration rates increase in the front of the filter bed by +10%. Thus, long-term operating behavior is sensitive to efficient filter utilization in compact treatment devices. HIGHLIGHTS A holistic approach is used to capture the system behavior concerning hydrodynamics, filter resistance and filter clogging. The filter media improves the distribution of flow in the lamella stage. Larger particles utilize only about 50% of the filter area due to inertia effects. Gradients of hydraulic conductivity regionally alter filtration rates and flow rates in the inclined plates.

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“…Retention profile data from experiments in gravel substrates were omitted, e.g. Gibson et al (2009) and Tang et al (2020). Due to the different experimental setups, the silt profiles in chromatography columns from Du et al (2018) were also excluded.…”

Section: Literature Reviewmentioning

confidence: 99%

Improving clogging predictions at managed aquifer recharge sites: a quantitative assessment on the vertical distribution of intrusive fines

2022

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Managed aquifer recharge (MAR) is an emerging approach to enhancing water storage capacity, improving water supply security and countering groundwater overexploitation. However, physical clogging, i.e. accumulation of suspended organic and inorganic solids within a sediment matrix, can lead to a significant reduction of infiltration rates and present difficulties in the functioning of MAR infrastructure. Clogging and subsequent reduction in infiltration capacity are often quantified based on monitoring data or field investigations, rather than on forecasts. Existing predictive models require specific parameterisation, making an application to heterogeneous sites, or under changing conditions, difficult. Hence, a generalised understanding of how intrusive fine particles distribute over depth during water recharge cycles for typical MAR infiltration basin sediments is needed to predict clogging susceptibility and clogging patterns already in the planning phase and before operation of MAR schemes. The study will contribute to operational reliability, deduce optimised management practices, and, ideally, reduce maintenance efforts. To achieve this goal, data from different soil-column clogging experiments are reviewed and complemented with experiments to establish a generally valid relationship for the vertical distribution of intrusive fines under consideration of the primary porous media’s and intruding particles’ characteristics. Obtained results allow for quantification of the amount of particles retained at the surface of the porous media, i.e. formation of a filter cake, a description of the distribution of fines over depth, and total clogging depth. Finally, the findings are applied to a real MAR case study site to showcase the quantification of clogging effects on recharge rates.

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Experiment research on physical clogging mechanism in the porous media and its impact on permeability

Cited by 32 publications

References 48 publications

Evaluation of Different Methods to Assess the Hydraulic Behavior in Horizontal Treatment Wetlands

Evaluation of Different Methods to Assess the Hydraulic Behavior in Horizontal Treatment Wetlands

Design-oriented evaluation of the hydrodynamics in a full-scale combined filter-lamella separator for urban stormwater treatment

Improving clogging predictions at managed aquifer recharge sites: a quantitative assessment on the vertical distribution of intrusive fines

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