Detecting defects in geomembranes of landfill liner systems: durable electrical method

Othmen, Inès; Bouassida, Mounir

doi:10.1179/1938636213z.00000000013

Cited by 6 publications

(6 citation statements)

References 6 publications

(5 reference statements)

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“…In addition, conductive textiles can be used in industrial applications such as electrokinetic geosynthetics (EKG) which is a class of material used to replace conventional electrodes in leak detection systems. The most commonly used electrodes are metals such as iron, steel or copper [2][3][4]. EKGs may be a single composition material that are electrically conductive or composite materials in which at least one element is electrically conductive.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a graphene coated nonwoven textile for industrial applications

et al. 2016

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A cost effective electrically conductive textile for large scale applications would revolutionise numerous industries. Herein, we demonstrate a novel processing approach to produce conductive textiles for industrial applications. A conductive nonwoven textile was successfully fabricated using a simple dip coating method. The nonwoven polyester was coated with liquid crystallite graphene oxide with subsequent non-toxic chemical reduction. The process is readily scalable. The graphene coated fabric has been characterized by electron microscopy as well as by electrical, mechanical, thermal and abrasion resistance measurements. It was found that the electrical surface resistivity of the prepared polyester-graphene composite fabric was 330 Ω □-1. The electrical surface resistivity was 3 and 150 times lower than that of polypyrrole coated woven polyester fabric and graphene coated nonwoven fabrics, respectively, in previously published reports. The hybrid polyester-graphene textile prepared here should find applications in high-performance geotextiles or as heating elements. Fabrication of Graphene Coated Nonwoven Textile for Industrial ApplicationsDharshika Kongahge, Javad Foroughi * , Sanjeev Gambhir, Geoffrey M. Spinks, Gordon G. Wallace A cost effective electrically conductive textile for large scale applications will revolutionise many industries. Herein, we demonstrate a novel processing approach to produce conductive textiles for industrial applications. The conductive nonwoven textile was successfully fabricated using a simple dip coating method. The polyester nonwoven was coated with liquid crystallite graphene oxide with subsequent non-toxic chemical reduction. The process is readily scalable. The graphene coated fabric has been characterized by electron microscopy as well as electrical, mechanical, thermal and abrasion resistance measurements. It was found that the electrical surface resistivity of the prepared polyester-graphene composite fabric was 330 Ω/□. The electrical surface resistivity was 3 and 150 times lower than that of polypyrrole coated woven polyester fabric and graphene coated nonwoven fabrics which were published previously. The hybrid polyestergraphene textile prepared here should find application as high-performance geotextiles or as heating elements.

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Section: Introductionmentioning

confidence: 99%

Fabrication of a graphene coated nonwoven textile for industrial applications

et al. 2016

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“…However, the geomembrane can easily be damaged or punctured by a sharp particle that can be found in a solid waste. Moreover, installation damages on geomembranes are not uncommon if the construction quality assurance and quality control are not strictly applied [ 74 , 75 ]. If such damages occur, leachate involving microplastics can seep into the underlying CCL.…”

Section: Solid Waste Disposal Facilities and Their Potential Role As A Source For Microplasticsmentioning

confidence: 99%

Microplastic Contamination in Soils: A Review from Geotechnical Engineering View

Monkul

Ozhan

2021

Polymers

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Microplastic contamination is a growing threat to marine and freshwater ecosystems, agricultural production, groundwater, plant growth and even human and animal health. Disintegration of plastic products due to mainly biochemical or physical activities leads to the formation and existence of microplastics in significant amounts, not only in marine and freshwater environments but also in soils. There are several valuable studies on microplastics in soils, which have typically focused on environmental, chemical, agricultural and health aspects. However, there is also a need for the geotechnical engineering perspective on microplastic contamination in soils. In this review paper, first, degradation, existence and persistence of microplastics in soils are assessed by considering various studies. Then, the potential role of solid waste disposal facilities as a source for microplastics is discussed by considering their geotechnical design and addressing the risk for the migration of microplastics from landfills to soils and other environments. Even though landfills are considered as one of the main geotechnical structures that contribute to the formation of considerably high amounts of microplastics and their contamination in soils, some other geotechnical engineering applications (i.e., soil improvement with tirechips, forming engineering fills with dredged sediments, soil improvement with synthetic polymer-based fibers, polystyrene based lightweight fill applications), as potential local source for microplastics, are also mentioned. Finally, the importance of geotechnical engineering as a mitigation tool for microplastics is emphasized and several important research topics involving geotechnical engineering are suggested.

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“…While the liners are expected to be intact over their operating lifespan, due to various factors such as poor placement assurance, insufficient quality control and harsh conditions of operation, it is observed that the integrity of these liners is often compromised (Buss et al, 1995;Giroud, 1984;Giroud and Bonaparte, 1989;Hoyos et al, 2015). Defects frequently develop in liners, resulting in leachate leakages and consequent contamination issues (Ben Othmen and Bouassida, 2013). Figure 2 shows the photograph of a typical empty leachate collection pond, lined with geosynthetic clay liner (GCL).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, it is essential to detect leakage issues as soon as they arise so that the impact to the environment and the associated costs for remediation can be minimised. Hence, the use of the electrical resistivity method for leak detection is widely prevalent for early leakage detection (ASTM D 6747-15 (ASTM, 2015), ASTM D 7002-16 (ASTM, 2016a), ASTM D7240-06 (ASTM, 2011), ASTM D 7703-16 (ASTM, 2016b, ASTM D 7953-14 (ASTM, 2014)), because of its ease of installation and operation and relatively low expenditures (Ben Othmen and Bouassida, 2013;Oh et al, 2008). This method is based on the electrical resistivity changes produced in soil due to its contamination by leachates.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the addition of even a small amount of leaching liquid to the soil results in a sharp decrease in its resistivity (Fukue et al, 1999;Mitchell and Soga, 2005;Munoz-Castelblanco et al, 2012;Naghibi et al, 2016;Pandey et al, 2015). These changes can be detected easily to determine soil contamination and, therefore, to detect leakage issues (Ben Othmen and Bouassida, 2013;Mitchell and Soga, 2005;Pandey and Shukla, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Resistivity profiles of Perth soil in Australia in leak-detection test

Pandey

Shukla

Habibi

2017

Geotechnical Research

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The use of a suitable leak-detection system for the prevention and mitigation of pollution due to lining system failures is integral to the proper management of landfill facilities. This paper briefly summarises various methods of leak detection that are currently being practised. The details of a newly developed leak-detection technique are also presented. The tests were conducted to evaluate the performance of the new technique by use of controlled leakage. The resulting resistivity profiles for Perth soil in Australia were obtained at 10 min. This method is found to be effective in detecting and locating liner leakage issues within 30 min from the instant when the defect develops. The electrical resistivity decreases with an increase in the leakage duration. The resistivity was found to increase with an increase in the distance/depth from the leak point. Installation of this innovative detection system below liners can enable the various waste containment facilities, such as landfills and leachate ponds, to monitor the lining systems and in case of failures, to take timely action for hazard mitigation. Results presented in this study can be useful for further development of sensors for leakage detection in lining systems. NotationA cross-sectional area of the specimen: m 2

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Detecting defects in geomembranes of landfill liner systems: durable electrical method

Cited by 6 publications

References 6 publications

Fabrication of a graphene coated nonwoven textile for industrial applications

Fabrication of a graphene coated nonwoven textile for industrial applications

Microplastic Contamination in Soils: A Review from Geotechnical Engineering View

Resistivity profiles of Perth soil in Australia in leak-detection test

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