Mechanisms of Leakage through Synthetic Landfill Liner Materials

Buss, S. E.; Butler, Adrian P.; Sollars, C.J.; Perry, R.; Johnston, Paul

doi:10.1111/j.1747-6593.1995.tb00952.x

Cited by 15 publications

(11 citation statements)

References 12 publications

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“…Behaviour of inorganic contaminants Introduction Current landfill liner systems are designed primarily as low permeability structures and commonly incorporate compacted clays or other mineral layers with synthetic membranes in composite or multi-barrier arrangements (Murray et al 1992;Seymour 1992). punctures and tears) often introduced during waste emplacement may reduce the effectiveness of the synthetic membrane (Buss et al 1995). This permeability specification may be difficult to obtain and test in the mineral layer under field conditions (Pierce et al 1986;Daniel & Brown 1988).…”

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confidence: 99%

Attenuation of landfill leachate by clay liner materials in laboratory columns: 2. Behaviour of inorganic contaminants

2001

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The chemical attenuation of inorganic contaminants in methanogenic landfill leachate, spiked with heavy metals (Cd, Cd, Ni and Zn), by two UK clay liner materials was compared in laboratory columns over 15 months. Ammonium was attenuated by ion-exchange but this attenuation was finite and when exhausted, NH4 passed through the liners at concentrations found in the leachate. The breakthrough behaviour of NH4 could be described by a simple distribution coefficient. Heavy metals were attenuated by sorption and precipitation of metal sulphide and carbonate compounds near the top of the liner. Adequate SO4 and CaCO3 in the liner is necessary to ensure the long term retention of heavy metals, and pH buffering agents added to stabilise reactive metal fractions should be admixed with the liner. Some metals may not be chemically attenuated by clay liners due to the formation of stable complexes with organic and/or colloidal fractions in leachate. Flushing of the liners with oxygenated water after leachate caused mobilisation of attenuated contaminants. Sorbed NH4 was released by the liners but groundwater loadings were manageable. Re-oxidation of metal sulphides under these conditions resulted in the release of heavy metals from the liners when the pH buffering capacity was poor. Contaminant attenuation by the clay liners was similar and the attenuation of NH4 and heavy metals could be predicted from the geochemical properties of the liner using simple tests. A conceptual model of clay liner performance is presented. Chemical attenuation of inorganic pollutants can be included in containment liner design to produce a dual reactive-passive barrier for landfills.

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Attenuation of landfill leachate by clay liner materials in laboratory columns: 2. Behaviour of inorganic contaminants

2001

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“…sand, soil and air) [14,[17][18][19]. This was used to evaluate the rate of solvent and contaminant transport across the tubular polymer membrane from inside to outside.…”

Section: Permeation Testsmentioning

confidence: 99%

Salt rejection and water flux through a tubular pervaporative polymer membrane designed for irrigation applications

Sule

Jiang

Templeton

et al. 2013

Environmental Technology

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The performance of a hydrophilic polyester tubular pervaporative membrane in treating high-salinity water for irrigation was investigated. The membrane was filled with contaminated water and placed in air, soil or sand media. When this occurs water diffuses through the tube, trapping salts within the tube. Sorption and permeation tests and scanning electron microscopy (SEM) were used to assess salt rejection and permeate flux through the tubular membrane when surrounded by deionized water, air, top soil or silver sand. Mean water uptake by the membrane was 0.5 L x m(-2) at room temperature and the water diffusion coefficient was 3.8 x 10(-4) cm2 x s(-1). The permeate flux across the membrane was 7.9 x 10(-3) L(m(-2) x h(-1)) in sand and 5.6 x 10(-2) in air. The rejection of sodium chloride by the tubular membrane in sand was 99.8% or above under all tested conditions. However, when the tube was filled with sodium chloride solution and placed in deionized water, salt was observed to permeate the membrane. SEM images confirmed that variable amounts of sodium chloride crystals were retained inside the membrane walls. These results support the potential application of such a tubular pervaporative membrane for irrigation applications using saline waters; however there may be reduced salt rejection under waterlogged soil conditions.

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“…Figure 1 shows the schematic profile of a typical single-liner system which consists of a leachate collection layer (k~10 −1 m/s), a compacted clay layer (k~10 −9 m/s) covered with high-density polyethylene (HDPE) geomembrane (GMB) and a leak detection/recovery layer (k~10 −1 m/s), where k is the hydraulic conductivity (Shukla and Yin, 2006). 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).…”

Section: Introductionmentioning

confidence: 99%

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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Mechanisms of Leakage through Synthetic Landfill Liner Materials

Cited by 15 publications

References 12 publications

Attenuation of landfill leachate by clay liner materials in laboratory columns: 2. Behaviour of inorganic contaminants

Attenuation of landfill leachate by clay liner materials in laboratory columns: 2. Behaviour of inorganic contaminants

Salt rejection and water flux through a tubular pervaporative polymer membrane designed for irrigation applications

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

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