阻水系統(Lining System)為垃圾掩埋場中重要之設施，以防止滲出水污染土壤地下水，目前國內大部分垃圾衛生掩埋場，均使用高密度聚乙烯(HDPE)地工止水膜作為單一阻水襯砌。國內許多事業廢棄物利用掩埋方式處理，其滲出水中之有機溶劑可能藉由擴散作用浸透HDPE，因此地工止水膜的化學浸透性將不容忽視。 本研究探討氯化碳氫化合物三氯乙烯、三氯甲烷、1,2-二氯乙烷、二氯甲烷與芳香族碳氫化合物苯、甲苯、乙基苯、苯乙烯等溶劑，在HDPE地工止水膜之浸入及浸透現象的相關性，以及厚度與溫度對擴散係數(Diffusion coefficient)、溶解度係數(Solubility coefficient)及浸透係數(Permeation coefficient)之影響。 研究為文獻中首次利用浸入試驗推導HDPE之浸透性，結果發現浸入與浸透之擴散係數、溶解度係數及穩定浸透速率均有顯著相關(p<0.05)。研究發現厚度會影響擴散係數及溶解度係數，經由電子顯微鏡觀察，本研究所使用之HDPE結構不同。擴散係數、浸透係數及溶解度係數隨溫度之變化，大致均可符合Arrhenius equation及Van't Hoff equation。 雖然浸入與浸透實驗得到之擴散係數與溶解度係數相關性良好，經由Fick’s Law建立之質傳模式，發現浸入實驗未能適切模擬ASTM F739浸透試驗結果。因此，簡單且快速之浸入試驗，可應用於評估有機溶劑浸透HDPE之穩定浸透速率；但是，浸透實驗條件較符合垃圾掩埋場不透水布之使用狀況。; In order to prevent the transport of leachate from the landfill into the surrounding environment, the lining system is the most important. HDPE geomembranes are the most used as lining in Taiwan. Organic solvents in the leachate may permeate through the geomembranes by diffusion. Especially, industrial wastes are also treated by landfill in Taiwan. It is important to concern the organic solvents released from the leachate permeate the geomembrane. In this study, permeation experiments and immersion tests were conducted to investigate the permeation and immersion of eight pure organic solvents. Comparisons were made between the immersion test and permeation experiment. The steady state permeation rates determined by the ASTM F739 method were significantly correlated to the immersion test, and their diffusion coefficients and solubility coefficients also showed good correlations (p<0.05). Therefore, the immersion test can be a simple and rapid approach to measure the steady state permeation rate. The diffusion coefficient and solubility were varied with the thickness of geomembranes. It may be because of the different structure of HDPE geomembranes. The diffusion coefficient and solubility were varied with the temperature and fitted the Arrhenius equation and Van't Hoff equation. Moreover, the modeling results indicated that the diffusion coefficients and solubilities determined by the immersion tests were unable to assess the chemicals permeation through geomembranes. And only permeation experiment can be the situation of the geomembrane in landfill.
