Canadian Geotechnical Journal, Ahead of Print.
The degradation behaviour of five multilayered textured white geomembranes (GMBs) is investigated when immersed in two synthetic low-level waste (LLW) leachates with pH 7 and 9 at a range of temperatures (40–85 °C) for 48–55 months. Results are compared to the performance of the GMBs in synthetic municipal solid waste (MSW) leachate. Increasing pH from 7 to 9 gives slightly faster antioxidant depletion in LLW leachate. The estimated time to nominal failure for the GMBs is at least 20% longer in LLW leachate than in MSW leachate containing surfactant that accelerates both antioxidant depletion and stress cracking. Thus, MSW leachate can be used as a conservative proxy to estimate the service life of a GMB in contact with LLW leachate. Two GMBs are considered very highly likely to meet the required 550 year design life of the near-surface disposal facilities even based on the most conservative prediction of the time to nominal failure for the GMBs.

中文翻译：

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多层纹理 HDPE 土工膜在低放废物应用中的使用寿命

加拿大岩土工程杂志，印刷前。
研究了五种多层纹理白色土工膜 (GMB) 在不同温度 (40–85 °C) 下浸入两种合成低放废物 (LLW) 渗滤液（pH 7 和 9）48–55 个月时的降解行为。结果与 GMB 在合成城市固体废物 (MSW) 渗滤液中的性能进行了比较。将 pH 从 7 增加到 9 会使 LLW 渗滤液中的抗氧化剂消耗速度稍微加快。LLW 渗滤液中 GMB 的预计失效时间比含有表面活性剂（表面活性剂会加速抗氧化剂消耗和应力开裂）的 MSW 渗滤液至少长 20%。因此，MSW 渗滤液可以用作保守的代理来估计与 LLW 渗滤液接触的 GMB 的使用寿命。即使基于对 GMB 名义故障时间的最保守预测，两个 GMB 也被认为非常有可能满足近地表处置设施所需的 550 年设计寿命。