EFFECT OF TEMPERATURE ON BTEX PERMEATION THROUGH HDPE AND FLUORINATED HDPE GEOMEMBRANES

[摘要] References(26)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.

[学科分类] 建筑学

[关键词] BTEX;diffusion;fluorination;geomembrane;hydrocarbons;partitioning;permeation;(IGC: M9)