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Durability of Three HDPE Geomembranes Immersed in Different Fluids at 85°C
The long-term performance of three different high-density polyethylene (HDPE) geomembranes (GMBs) is investigated at 85°C using immersion tests. By comparing the degradation behavior of the three GMBs in different synthetic leachates, it is shown that different chemical constituents in the leachate affected different stages of the degradation, with surfactant having the greatest effect on antioxidant depletion (Stage I) and salts having the greatest effect on the degradation after antioxidant depletion (Stages II and III). The magnitude of the effect of these chemical constituents differed from one GMB to another. Thus, for the purpose of comparing the relative long-term performance of the three GMBs for municipal solid waste (MSW) landfill applications, the GMBs were immersed in a synthetic leachate (Leachate A), which contained the primary constituents (i.e., salts, volatile fatty acids, surfactant, and trace metals under reduced conditions) present in the leachate from a large MSW landfill leachate located in Canada. At 85°C, the longest antioxidant depletion stage was for the GMB with the highest resistance to antioxidant depletion in Leachate A, even though its initial oxidative induction time values were not the highest of the three GMBs. After antioxidant depletion, the greatest resistance to degradation was for the GMB with the highest initial stress crack resistance and the lowest melt flow ratio.
Durability of Three HDPE Geomembranes Immersed in Different Fluids at 85°C
The long-term performance of three different high-density polyethylene (HDPE) geomembranes (GMBs) is investigated at 85°C using immersion tests. By comparing the degradation behavior of the three GMBs in different synthetic leachates, it is shown that different chemical constituents in the leachate affected different stages of the degradation, with surfactant having the greatest effect on antioxidant depletion (Stage I) and salts having the greatest effect on the degradation after antioxidant depletion (Stages II and III). The magnitude of the effect of these chemical constituents differed from one GMB to another. Thus, for the purpose of comparing the relative long-term performance of the three GMBs for municipal solid waste (MSW) landfill applications, the GMBs were immersed in a synthetic leachate (Leachate A), which contained the primary constituents (i.e., salts, volatile fatty acids, surfactant, and trace metals under reduced conditions) present in the leachate from a large MSW landfill leachate located in Canada. At 85°C, the longest antioxidant depletion stage was for the GMB with the highest resistance to antioxidant depletion in Leachate A, even though its initial oxidative induction time values were not the highest of the three GMBs. After antioxidant depletion, the greatest resistance to degradation was for the GMB with the highest initial stress crack resistance and the lowest melt flow ratio.
Durability of Three HDPE Geomembranes Immersed in Different Fluids at 85°C
Abdelaal, Fady B. (author) / Rowe, R. Kerry (author)
2014-10-31
Article (Journal)
Electronic Resource
Unknown
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