Effect of wet-dry cycles on polymer treated bentonite in seawater: swelling ability, hydraulic conductivity and crack analysis

Camillis, Michela De; Emidio, Gemmina Di; Bezuijen, Adam; Flores, Ramiro Daniel Verástegui; Stappen, Jeroen Van; Cnudde, Veerle

doi:10.1016/j.clay.2016.11.011

Cited by 55 publications

(14 citation statements)

References 22 publications

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“…It is well established that pre-hydration and maintenance of a high hydration state of the sodium bentonite are necessary for optimal attenuation of both liquid and gaseous diffusion [72,112,126] and therefore the presence of an effective barrier against PFAS compounds (Figure 4). A variety of polymer-enhanced sodium bentonites are currently available on the worldwide market, including in Australia [127][128][129][130]. While they have been promoted for their ability to enhance swelling and to provide some resistance to increased ionic strength, there remains some possibility that those polymers of low ionicity, or even the non-ionic forms, could additionally be useful for enhancing partitioning of PFAS compounds to the bentonite.…”

Section: Bentonitementioning

confidence: 99%

Interactions of Per- and Polyfluoralkyl Substances (PFAS) with Landfill Liners

Gates¹,

MacLeod²,

Fehérvári³

et al. 2020

AEER

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This review synthesises the available published research on interactions of per- and polyfluoroalkyl substances (PFAS) with landfill liners, with the view to inform on the expected behaviour of these persistent environmental pollutants in landfills. The review addresses the nature and significant types of PFAS compounds that are destined for landfills, as well as their by-product. It discusses the known and anticipated interactions with separate landfill liner components, namely geomembranes, geosynthetic clay liners and compacted clay liners. Various water-soluble PFAS are shown to advectively transport through geosynthetic clay liners (GCL) and showcase the limitations of relying on mineral liners alone to retain PFAS. Addition of activated carbon, while increasing saturated hydraulic conductivity, significantly increases PFAS retention by the GCL and reduced PFAS flux to manageable concentrations. An assessment of the relative risk for environmental exposure of different types of PFAS from landfills through interaction with those liner components is achieved with reference to published case studies of PFAS detection in and around landfills from Australia and around the World.

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Section: Bentonitementioning

confidence: 99%

Interactions of Per- and Polyfluoralkyl Substances (PFAS) with Landfill Liners

Gates¹,

MacLeod²,

Fehérvári³

et al. 2020

AEER

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“…These cracks can be produced by applied stress concentration, excessive stress over time, overload, defective assembly or environmental conditions. Crack detection (through non-destructive methods) can be performed using different techniques such as radiography, ultrasonic and shearography [37], penetrating liquid [38], magnetic particle inspection [39].…”

Section: Custom Sensorsmentioning

confidence: 99%

Advanced sensor-based maintenance in real-world exemplary cases

et al. 2020

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Collecting complex information on the status of machinery is the enabler for advanced maintenance activities, and one of the main players in this process is the sensor. This paper describes modern maintenance strategies that lead to Condition-Based Maintenance. This paper discusses the sensors that can be used to support maintenance, as of different categories, spanning from common off-the-shelf sensors, to specialized sensors monitoring very specific characteristics, and to virtual sensors. This paper also presents four different real-world examples of project pilots that make use of the described sensors and draws a comparison between them. In particular, each scenario has unique characteristics requiring different families of sensors, but on the other hand provides similar characteristics on other aspects.

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“…In this situation, polymerized bentonite such as Bentonite polymer composites (BPCs) (Scalia IV et al 2014), Sodium carboxymethyl cellulose (Na-CMC) based dense-prehydrated (DPH) geosynthetic clay liner (Katsumi et al 2008;Mazzieri and Pasqualini 2008), and HYPER clay (De Camillis et al 2017;Di Emidio et al 2010) can maintain low hydraulic conductivity in divalent cationic solutions. The interaction between polymer and bentonite defines the sealing mechanism of polymerized bentonite.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Performance of Alginate-Based Bentonite

2022

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Bentonite clay is widely used as a hydraulic barrier in geosynthetic clay liners and cut-off walls. The interaction of the clay with divalent electrolytic solutions such as Ca 2+ or Mg 2+ deteriorates its sealing properties. The treatment of bentonite with polymers has improved its hydraulic properties; however, sustainability concerns have led to the discovery of an alternate polymer. Sodium alginate was used to prepare a new, more sustainable polymerized bentonite clay. The alginate was selected due to its recent laboratory extraction from wastewater. This paper presents the performance of the alginate polymer-based bentonite clay in terms of swelling and hydraulic conductivity. Overall, the preliminary results were optimistic towards the use of alginate in polymerized clay. In short, the clay has the potential to be used as an effective hydraulic barrier in the construction industry, which would promote sustainable development.

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Effect of wet-dry cycles on polymer treated bentonite in seawater: swelling ability, hydraulic conductivity and crack analysis

Cited by 55 publications

References 22 publications

Interactions of Per- and Polyfluoralkyl Substances (PFAS) with Landfill Liners

Interactions of Per- and Polyfluoralkyl Substances (PFAS) with Landfill Liners

Advanced sensor-based maintenance in real-world exemplary cases

Hydraulic Performance of Alginate-Based Bentonite

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