The Experts below are selected from a list of 5574 Experts worldwide ranked by ideXlab platform
Kerry R Rowe - One of the best experts on this subject based on the ideXlab platform.
-
btex migration through various Geomembranes and vapor barriers
Journal of Geotechnical and Geoenvironmental Engineering, 2016Co-Authors: D D Jones, Kerry R RoweAbstract:AbstractFour polyethylene based vapor barriers and six different Geomembranes were examined for their diffusive properties with respect to benzene, toluene, ethylbenzene, and xylenes (BTEX). All four vapor barriers performed comparably. Of the Geomembranes tested, high-density polyethylene (HDPE) showed the greatest diffusive resistance to BTEX, while polyvinyl chloride (PVC) showed the least, LLDPE (linear low-density polyethylene), CSPE (chlorosulphonated polyethylene) and two KEE/EIA (ketone ethylene ester/ethylene interpolymer alloy) Geomembranes all performed similarly, bounded by HDPE and PVC. Based on data collected at 22, 30, and 40°C, Arrhenius relationships are presented for the six Geomembranes. Each geomembrane was evaluated for performance as a diffusive barrier in a landfill cover scenario. Each vapor barrier and two Geomembranes were evaluated, through contaminant transport modeling, for performance as a diffusive barrier to vapor intrusion into a warehouse and substantial potential differe...
-
antioxidant depletion from five Geomembranes of same resin but of different thicknesses immersed in leachate
Geotextiles and Geomembranes, 2014Co-Authors: Kerry R Rowe, A.m.r. EwaisAbstract:Abstract The effect of thickness on the antioxidants depletion time for five high density polyethylene Geomembranes (with nominal thicknesses of 0.5, 1.0, 1.5, 2.0, and 2.4 mm) immersed in synthetic leachate at six different temperatures (25, 40, 55, 70, 85 and 95 °C) is investigated. The Geomembranes were manufactured from the same geomembrane resin (i.e., polymer resin, antioxidant/stabilizer package, and carbon-black batch). Four (1.0, 1.5, 2.0, and 2.4 mm) of the five Geomembranes were manufactured during the same production run by changing the pulling speed of the geomembrane from the extrusion die. The depletion of antioxidants/stabilizers inferred from both standard (Std-) and high pressure (HP-) oxidative induction times (OIT)s show that increasing geomembrane thickness resulted in longer depletion times for temperatures above 40 °C but little to negligible difference in projected depletion times below 40 °C for this antioxidant package. The increase in depletion times was not proportional to the square of the geomembrane thickness as theoretically predicted if depletion was diffusion controlled and the diffusion coefficient was the same for each GMB. Thus, the depletion of antioxidants is not fully governed by diffusion and/or the GMB's diffusion coefficients are different. Regardless of the GMB thickness, the time for Std-OIT depletion was shorter than the time to residual HP-OIT above 70 °C but was longer at or below 55 °C. For example, for 2.4 mm GMB, the inferred time for Std-OIT depletion was 0.2–0.3 (at 85 °C), 2–3.5 (at 55 °C) and 9.5 (at 40 °C) times that for the HP-OIT to deplete to residual. The projected Std-OIT depletion times for 1.0 and 2.4 mm GMBs were: 2.7 and 4 years, respectively, at 60 °C; 23 and 26 years, respectively, at 40 °C; and about 330 years at 20 °C.
-
service life of hdpe Geomembranes subjected to elevated temperatures
Journal of Hazardous Toxic and Radioactive Waste, 2014Co-Authors: Navid H Jafari, Timothy D Stark, Kerry R RoweAbstract:Subtitle D landfills may experience elevated temperatures for a variety of reasons such as hydration of combustion ash, waste biodegradation with and without leachate recirculation, aluminum production waste and combustion ash reactions, and wastes received with elevated temperature. Elevated temperatures can reduce service life or effectiveness of high density polyethylene (HDPE) geomem- branes by accelerating antioxidant depletion of Geomembranes and polymer degradation. A case history is presented to illustrate the potential effects of elevated temperatures and time-temperature history on a HDPE geomembrane and the associated reduction in service life or effectiveness. The geomembrane service life was influenced by the peak temperature, e.g., 60-80°C, the duration of peak temperatures (time-temperature history), and the time to complete antioxidant depletion. This paper also discusses possible criteria for assessing the service life of Geomembranes, such as applicable engineering properties, locations for service life assessments, definitions of geomembrane service life, and measures that could be adopted if service life were reduced significantly. DOI: 10.1061/(ASCE)HZ.2153-5515.0000188. © 2014 American Society of Civil Engineers. Author keywords: Aluminum; Dross; Heat generation; Exothermic chemical reaction; Landfill fire; Landfill gas; Elevated temperature; Geomembranes; Geosynthetics; Durability; Waste disposal; Service life; Municipal solid waste.
-
effect of temperature on btex permeation through hdpe and fluorinated hdpe Geomembranes
Soils and Foundations, 2011Co-Authors: Kerry R Rowe, Toshifumi Mukunoki, Heather LindsayAbstract:ABSTRACT The diffusion characteristics of high density polyethylene (HDPE) Geomembranes with respect to hydrocarbons are investigated at temperatures of 22±1°C and 6±1°C. Results are reported for an aqueous solution of benzene, toluene, ethylbenzene, and xylene (BTEX). The partitioning coefficient obtained from sorption/immersion test is shown to be effectively the same as that from desorption test. Both conventional untreated (HDPE) and fluorinated (f-HDPE) Geomembranes are examined and it is shown that a fluorinated layer on the surface of an HDPE geomembrane increases its resistance to the permeation of BTEX penetrants by about a factor of 2.4 at 22°C and 1.8 at 6°C. An Arrhenius relationship is developed that could be used for estimating hydrocarbon permeation at different temperatures between 6°C and 22°C for both the HDPE and f-HDPE Geomembranes examined.
-
diffusive transport of vocs through lldpe and two coextruded Geomembranes
Journal of Geotechnical and Geoenvironmental Engineering, 2010Co-Authors: Rebecca S Mcwatters, Kerry R RoweAbstract:The diffusive properties of two coextruded Geomembranes, one with a polyamide inner core and the other with an ethylene vinyl-alcohol (EVOH) inner core, and a standard 0.53-mm (20-mil) linear low-density polyethylene (LLDPE) geomembrane were examined. Diffusion and sorption laboratory tests were performed to estimate the parameters controlling diffusive migration, including the partitioning, diffusion, and permeation coefficients of the geomembrane in both the aqueous and vapor phases. Results indicate a significant reduction in mass flux through the coextruded Geomembranes compared to conventional LLDPE. The EVOH coextruded geomembrane had the lowest permeation coefficients ( Pg ) with a range of ( 2–6 ) × 10−12 m2 s−1 for diffusion from the aqueous phase. These values for EVOH are upper bounds and the actual values may be lower than as stated. The polyamide (nylon) coextruded geomembrane had higher values than for EVOH, with a Pg range of ( 0.7–2.2 ) × 10−11 m2 s−1 from the aqueous phase. The hi...
Hemantkumar Naik - One of the best experts on this subject based on the ideXlab platform.
-
chemical compatibility testing of Geomembranes sorption desorption diffusion permeation and swelling phenomena
Geotextiles and Geomembranes, 1998Co-Authors: Tejraj M Aminabhavi, Hemantkumar NaikAbstract:Abstract The laboratory test results of 14 organic liquids (widely varying in nature) for high density polyethylene, linear low density polyethylene, very low density polyethylene and polypropylene Geomembranes are presented at 25, 50 and 70°C. The partition coefficients have been calculated by monitoring the increase in mass of geomembrane immersed in the fluid of interest from its initial value until the mass of geomembrane becomes constant. From such data, diffusion and permeation coefficients have been calculated using Fick’s equation from the initial linear portions of the sorption curves. Swelling of the Geomembranes has also been studied from a measurement of an increase in volume, thickness and diameter. From a temperature dependence of sorption, diffusion and permeation coefficients, the Arrhenius parameters have been calculated.
-
chemical compatibility study of Geomembranes sorption desorption diffusion and swelling phenomena
Journal of Hazardous Materials, 1998Co-Authors: Tejraj M Aminabhavi, Hemantkumar NaikAbstract:Sorption/desorption results of n-alkanes into high density polyethylene, linear low density polyethylene, very low density polyethylene and polypropylene Geomembranes are presented at 25, 50 and 70°C. Sorption results are obtained by a gravimetric method and diffusion coefficients have been calculated by using Fick's equation from the initial linear portions of the sorption/desorption curves. Swelling of the Geomembranes was studied from a measurement of the increase in volume, thickness and diameter. From a temperature dependence of sorption and diffusion coefficients, the Arrhenius parameters have been calculated. Liquid concentration profiles have been computed using Fick's equation for the appropriate initial and boundary conditions. The results of this study may have relevance in selecting the suitable geomembrane for a specific application in hazardous waste chemical ponds and other similar situations.
R. Kerry Rowe - One of the best experts on this subject based on the ideXlab platform.
-
Permeation of Volatile Organic Compounds through EVOH Thin Film Membranes and Coextruded LLDPE / EVOH / LLDPE Geomembranes
Journal of Geotechnical and Geoenvironmental Engineering, 2014Co-Authors: Rebecca S Mcwatters, R. Kerry RoweAbstract:© 2014 American Society of Civil Engineers. Coextruded Geomembranes with an inner ethylene vinyl alcohol (EVOH) layer are gaining attention as potential improved barriers to volatile organic compounds (VOCs) when used in barrier systems that would traditionally use high-density polyethylene (HDPE) Geomembranes. The permeation characteristics of nine common VOCs in aqueous solutions through the EVOH layer are investigated for two thin films: a 0.015-mm-thick, 32 mol% EVOH and a 0.02-mm-thick, 44 mol% EVOH. The VOCs included aromatic hydrocarbons [benzene, toluene, ethylbenzene, and xylenes (BTEX)] and chlorinated hydrocarbons [1,2-dichloroethane (1,2-DCA), dichloromethane (DCM), trichloroethylene (TCE), and tetrachloroethylene (PCE)]. The BTEX permeation coefficients, Pg, range from 1.4 × 10-14 to 25 × 10-14 m2 · s-1 depending on the contaminant and mol% EVOH. When a 0.02-mm-thick, 38 mol% EVOH thin film layer is coextruded with linear low-density polyethylene (LLDPE) to form a 0.53-mm-thick geomembrane, the BTEX permeation values of the EVOH thin film itself are reduced to Pg = 0.4 × 10-14 to 0.7 × 10-14 m2 · s-1 The higher permeation coefficients for the thin films as compared with the film contained in the coextruded LLDPE/EVOH/LLDPE geomembrane are attributed to interactions between the water in the aqueous solution and the EVOH layer, an interaction that is prevented by the presence of the LLDPE in the coextruded geomembrane. These Pg values are two to four orders of magnitude lower than values that have been observed for LLDPE and HDPE Geomembranes. The effect of temperature on VOC permeation was also studied for the 32 mol% EVOH thin films at 23, 30, 40, and 50 ± 1° C. An Arrhenius relationship was developed that allows the evaluation of the permeation characteristics at temperatures 23-50°C and, by extrapolation, an estimation of the values for temperatures a little higher or lower than the test temperatures.
-
Ageing of exposed Geomembranes at locations with different climatological conditions
Canadian Geotechnical Journal, 2014Co-Authors: R. Kerry Rowe, A.m.r. EwaisAbstract:The degradation of high-density polyethylene (HDPE) Geomembranes exposed to the elements depends, inter alia, on the climatological conditions. This study investigates the degradation in the properties of HDPE Geomembranes installed at two mine facilities after almost 16 years of exposure in a warm–hot climate and at a research site after 6 years of exposure in a mild–cold climate. Samples were exhumed at the field sites from different locations and the properties of the geomembrane were measured in the laboratory. The depletion of antioxidants detected by the standard oxidative induction time (Std-OIT) test for the geomembrane installed at the research site was faster on the slope than on the base; however, there was negligible difference in the depletion of antioxidants–stabilizers detected by the high-pressure oxidative induction time (HP-OIT) test between the slope and base. Under the field conditions described, the antioxidant depletion time for the exposed geomembrane installed at the research site ..., La dégradation des géomembranes en polyéthylène à haute densité (PEHD) exposées aux éléments dépend entre autres des conditions climatiques. Cette étude évalue la dégradation des propriétés de géomembranes en PEHD installées sur deux sites miniers après 16 ans d’exposition dans un climat chaud et sur un site de recherche 6 ans après l’exposition dans un climat tempéré–froid. Des échantillons ont été exhumés des sites sur le terrain à plusieurs endroits et les propriétés de la géomembrane ont été mesurées en laboratoire. L’épuisement en antioxydants, détecté à l’aide de l’essai du temps d’induction de l’oxydation standard (Std-OIT), de la géomembrane installée au site de recherche était plus rapide sur la pente que sur la base, cependant il y avait une différence négligeable entre l’épuisement des antioxydants–stabilisateurs détectés par l’essai du temps d’induction de l’oxydation à haute pression (HP-OIT) sur la pente et sur la base. Dans les conditions de terrain décrites, le temps d’épuisement des antio...
-
Sorption and diffusion of BTEX through thin-film EVOH
Geo-Frontiers 2011: Advances in Geotechnical Engineering, 2011Co-Authors: Rebecca S Mcwatters, Asce Geo-institute Of, International Industrial Fabrics Association, Society North American Geosynthetics, R. Kerry Rowe, Association Geosynthetics MaterialsAbstract:The diffusive properties of thin-layer ethylene vinyl alcohol (EVOH) thin-films often used in vapour barriers and co-extruded Geomembranes were studied. Sorption, diffusion and permeation were studied for benzene, toluene, ethylbenzene and xylenes (BTEX) contaminants in dilute aqueous solutions. Films with 32 and 44 mol EVOH were studied, showing a decrease in permeability with higher EVOH content. Sorption was studied for the EVOH thin-films at room temperature, as well as 30, 40 and 50°C. An increase in sorption of BTEXs was observed at elevated temperatures. Results show that the permeability of these non-polar hydrocarbons decreases with decreasing EVOH content from the 32 mol thin-film (Pg=15-57 ×10- 14m 2s-1), to the 44 mol thin-film (Pg=3-5 ×10-14m2s-1). When compared with the EVOH inner barrier layer of a co-extruded LLDPE/EVOH geomembrane, the co-extruded geomembrane has the lowest Pg (0.7-0.9 ×10 minus;14m2s-1). Pg values are significantly lower for EVOH thin-films and co-extruded Geomembranes when compared with standard LLDPE, HDPE and PVC Geomembranes. © 2011 ASCE.
-
Effects of thickness on the aging of HDPE Geomembranes
Journal of Geotechnical and Geoenvironmental Engineering, 2010Co-Authors: R. Kerry Rowe, M Z Islam, Yick Grace HsuanAbstract:The results of an accelerated aging test program to evaluate the effect of thickness on the depletion of antioxidants from high-density polyethylene (HDPE) Geomembranes and subsequent degradation of the physical properties are reported. Three commercially available HDPE Geomembranes having nominal thicknesses of 1.5, 2.0, and 2.5 mm were examined. The Geomembranes were immersed in a synthetic leachate at 85, 70, 55, and 22°C and tested for oxidative induction time, crystallinity, melt index (MI), tensile properties, and stress-crack resistance. The antioxidant depletion rate for the 1.5 mm geomembrane was faster than for the 2.0 and 2.5 mm Geomembranes. Antioxidant depletion time was predicted at representative landfill temperatures of 20-60°C using Arrhenius modeling and was found to increase with geomembrane thickness for the three Geomembranes examined. Based on the results of crystallinity, MI, and stress-crack resistance, the degradation of the geomembrane was slowest for the thickest geomembrane. These results suggest that a thicker geomembrane may have a longer service life (other things being equal). © 2010 ASCE.
-
Impact of landfill liner time–temperature history on the service life of HDPE Geomembranes
Waste Management, 2009Co-Authors: R. Kerry Rowe, M Z IslamAbstract:Abstract The observed temperatures in different landfills are used to establish a number of idealized time–temperature histories for geomembrane liners in municipal solid waste (MSW) landfills. These are then used for estimating the service life of different HDPE Geomembranes. The predicted antioxidant depletion times (Stage I) are between 7 and 750 years with the large variation depending on the specific HDPE geomembrane product, exposure conditions, and most importantly, the magnitude and duration of the peak liner temperature. The higher end of the range corresponds to data from Geomembranes aged in simulated landfill liner tests and a maximum liner temperature of 37 °C. The lower end of the range corresponds to a testing condition where Geomembranes were immersed in a synthetic leachate and a maximum liner temperature of 60 °C. The total service life of the Geomembranes was estimated to be between 20 and 3300 years depending on the time–temperature history examined. The range illustrates the important role that time–temperature history could play in terms of geomembrane service life. The need for long-term monitoring of landfill liner temperature and for geomembrane ageing studies that will provide improved data for assessing the likely long-term performance of Geomembranes in MSW landfills are highlighted.
Tejraj M Aminabhavi - One of the best experts on this subject based on the ideXlab platform.
-
chemical compatibility of Geomembranes sorption diffusion and swelling phenomena
Journal of Plastic Film and Sheeting, 1999Co-Authors: Tejraj M Aminabhavi, H G NaikAbstract:The chemical compatibility results studied by measurement of sorption, diffusion and swelling of seven aromatic liquids into four Geomembranes viz. high density polyethylene (HDPE), linear low density polyethylene (LLDPE), very low density polyethylene (VLDPE) and polypropylene (PP) are presented at 25, 50 and 70°C. Diffusion coefficients have been calculated using Fick's equation. The swelling of Geomembranes was measured by monitoring the dimensional response of the membranes and thereby calculating the increase in volume. Results of this research would be useful in the proper selection of a suitable geomembrane for a specific application involving exposure to organic liquids.
-
chemical compatibility testing of Geomembranes sorption desorption diffusion permeation and swelling phenomena
Geotextiles and Geomembranes, 1998Co-Authors: Tejraj M Aminabhavi, Hemantkumar NaikAbstract:Abstract The laboratory test results of 14 organic liquids (widely varying in nature) for high density polyethylene, linear low density polyethylene, very low density polyethylene and polypropylene Geomembranes are presented at 25, 50 and 70°C. The partition coefficients have been calculated by monitoring the increase in mass of geomembrane immersed in the fluid of interest from its initial value until the mass of geomembrane becomes constant. From such data, diffusion and permeation coefficients have been calculated using Fick’s equation from the initial linear portions of the sorption curves. Swelling of the Geomembranes has also been studied from a measurement of an increase in volume, thickness and diameter. From a temperature dependence of sorption, diffusion and permeation coefficients, the Arrhenius parameters have been calculated.
-
chemical compatibility study of Geomembranes sorption desorption diffusion and swelling phenomena
Journal of Hazardous Materials, 1998Co-Authors: Tejraj M Aminabhavi, Hemantkumar NaikAbstract:Sorption/desorption results of n-alkanes into high density polyethylene, linear low density polyethylene, very low density polyethylene and polypropylene Geomembranes are presented at 25, 50 and 70°C. Sorption results are obtained by a gravimetric method and diffusion coefficients have been calculated by using Fick's equation from the initial linear portions of the sorption/desorption curves. Swelling of the Geomembranes was studied from a measurement of the increase in volume, thickness and diameter. From a temperature dependence of sorption and diffusion coefficients, the Arrhenius parameters have been calculated. Liquid concentration profiles have been computed using Fick's equation for the appropriate initial and boundary conditions. The results of this study may have relevance in selecting the suitable geomembrane for a specific application in hazardous waste chemical ponds and other similar situations.
M Z Islam - One of the best experts on this subject based on the ideXlab platform.
-
Effects of thickness on the aging of HDPE Geomembranes
Journal of Geotechnical and Geoenvironmental Engineering, 2010Co-Authors: R. Kerry Rowe, M Z Islam, Yick Grace HsuanAbstract:The results of an accelerated aging test program to evaluate the effect of thickness on the depletion of antioxidants from high-density polyethylene (HDPE) Geomembranes and subsequent degradation of the physical properties are reported. Three commercially available HDPE Geomembranes having nominal thicknesses of 1.5, 2.0, and 2.5 mm were examined. The Geomembranes were immersed in a synthetic leachate at 85, 70, 55, and 22°C and tested for oxidative induction time, crystallinity, melt index (MI), tensile properties, and stress-crack resistance. The antioxidant depletion rate for the 1.5 mm geomembrane was faster than for the 2.0 and 2.5 mm Geomembranes. Antioxidant depletion time was predicted at representative landfill temperatures of 20-60°C using Arrhenius modeling and was found to increase with geomembrane thickness for the three Geomembranes examined. Based on the results of crystallinity, MI, and stress-crack resistance, the degradation of the geomembrane was slowest for the thickest geomembrane. These results suggest that a thicker geomembrane may have a longer service life (other things being equal). © 2010 ASCE.
-
impact of landfill liner time temperature history on the service life of hdpe Geomembranes
Waste Management, 2009Co-Authors: Kerry R Rowe, M Z IslamAbstract:Abstract The observed temperatures in different landfills are used to establish a number of idealized time–temperature histories for geomembrane liners in municipal solid waste (MSW) landfills. These are then used for estimating the service life of different HDPE Geomembranes. The predicted antioxidant depletion times (Stage I) are between 7 and 750 years with the large variation depending on the specific HDPE geomembrane product, exposure conditions, and most importantly, the magnitude and duration of the peak liner temperature. The higher end of the range corresponds to data from Geomembranes aged in simulated landfill liner tests and a maximum liner temperature of 37 °C. The lower end of the range corresponds to a testing condition where Geomembranes were immersed in a synthetic leachate and a maximum liner temperature of 60 °C. The total service life of the Geomembranes was estimated to be between 20 and 3300 years depending on the time–temperature history examined. The range illustrates the important role that time–temperature history could play in terms of geomembrane service life. The need for long-term monitoring of landfill liner temperature and for geomembrane ageing studies that will provide improved data for assessing the likely long-term performance of Geomembranes in MSW landfills are highlighted.
-
Impact of landfill liner time–temperature history on the service life of HDPE Geomembranes
Waste Management, 2009Co-Authors: R. Kerry Rowe, M Z IslamAbstract:Abstract The observed temperatures in different landfills are used to establish a number of idealized time–temperature histories for geomembrane liners in municipal solid waste (MSW) landfills. These are then used for estimating the service life of different HDPE Geomembranes. The predicted antioxidant depletion times (Stage I) are between 7 and 750 years with the large variation depending on the specific HDPE geomembrane product, exposure conditions, and most importantly, the magnitude and duration of the peak liner temperature. The higher end of the range corresponds to data from Geomembranes aged in simulated landfill liner tests and a maximum liner temperature of 37 °C. The lower end of the range corresponds to a testing condition where Geomembranes were immersed in a synthetic leachate and a maximum liner temperature of 60 °C. The total service life of the Geomembranes was estimated to be between 20 and 3300 years depending on the time–temperature history examined. The range illustrates the important role that time–temperature history could play in terms of geomembrane service life. The need for long-term monitoring of landfill liner temperature and for geomembrane ageing studies that will provide improved data for assessing the likely long-term performance of Geomembranes in MSW landfills are highlighted.
-
permeation of btex through unaged and aged hdpe Geomembranes
Journal of Geotechnical and Geoenvironmental Engineering, 2009Co-Authors: M Z Islam, R K RoweAbstract:The effects of aging of high-density polyethylene (HDPE) Geomembranes on the diffusion and partitioning of a group of volatile organic compounds (VOCs) are examined. Two different 1.5 mm thick HDPE Geomembranes were aged in the laboratory at 85°C by immersing in a synthetic leachate for up to 32 months. The results of partitioning and diffusion tests performed at room temperature on both unaged and aged Geomembranes using a dilute aqueous solution containing four VOCs commonly found in landfill leachates [benzene, toluene, ethylbenzene, and xylenes (BTEX)] are reported. The diffusion and partitioning coefficients decreased with increased aging. The calculated permeation coefficients decreased by 36–62% after aging the geomembrane for about 10–32 months. This decrease in diffusion, partitioning, and permeation coefficients is related to the increase in geomembrane crystallinity during aging. A relationship between partitioning, diffusion, and permeation coefficients with the geomembrane crystallinity is established and could potentially be used to evaluate the migration of VOCs through HDPE Geomembranes. Aging of HDPE geomembrane did not increase diffusive transport of organic contaminants.
-
EFFECT OF HDPE GEOMEMBRANE THICKNESS ON THE DEPLETION OF ANTIOXIDANTS
2007Co-Authors: M Z Islam, R. Kerry RoweAbstract:This study describes an accelerated ageing test to evaluate the effect of thickness on the depletion of antioxidant from high density polyethylene (HDPE) Geomembranes. Three HDPE Geomembranes having nominal thicknesses of 1.5, 2.0, and 2.5mm were examined in the testing program. The Geomembranes were immersed in a synthetic leachate at four temperatures: 22, 55, 70, and 85 0 C. The depletion of antioxidant was monitored in terms of the oxidative induction time (OIT). It was observed that antioxidants depleted at a faster rate from 1.5mm geomembrane than from the 2.0 and 2.5mm Geomembranes. Antioxidant depletion time was predicted using Arrhenius modeling and was found to be longer for thicker Geomembranes, which suggests that a thicker geomembrane may be expected to have a longer service life (other things being equal).