多层纹理HDPE土工膜在低水平废物应用中的寿命研究

IF 3 3区工程技术 Q2 ENGINEERING, GEOLOGICAL

Canadian Geotechnical Journal Pub Date : 2023-07-25 DOI:10.1139/cgj-2023-0039

M. Zafari, R. Rowe, F. Abdelaal

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引用次数: 0

摘要

研究了5种多层纹理白色土工膜(GMBs)在pH值为7和9的两种合成低浓度废物(LLW)渗滤液中浸泡48-55个月(40-85℃)的降解行为。结果与合成城市生活垃圾(MSW)渗滤液中的GMBs性能进行了比较。将pH从7增加到9,LLW渗滤液中的抗氧化剂消耗速度略快。在含有表面活性剂的垃圾渗滤液中，gmb达到名义失效的估计时间至少比含有表面活性剂的垃圾渗滤液长20%，表面活性剂加速了抗氧化剂的消耗和应力开裂。因此，都市固体废物渗滤液可作为估计与低密度固体废物渗滤液接触的小轿车的使用寿命的保守指标。即使根据最保守的gmb失效时间预测，两个gmb也被认为非常有可能满足近地面处置设施550年的设计寿命要求。

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Longevity of Multi-layered Textured HDPE Geomembranes in Low-level Waste Applications

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 (40-85oC) 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.

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来源期刊

Canadian Geotechnical Journal 地学-地球科学综合

CiteScore

7.20

自引率

5.60%

发文量

163

审稿时长

7.5 months

期刊介绍： The Canadian Geotechnical Journal features articles, notes, reviews, and discussions related to new developments in geotechnical and geoenvironmental engineering, and applied sciences. The topics of papers written by researchers and engineers/scientists active in industry include soil and rock mechanics, material properties and fundamental behaviour, site characterization, foundations, excavations, tunnels, dams and embankments, slopes, landslides, geological and rock engineering, ground improvement, hydrogeology and contaminant hydrogeology, geochemistry, waste management, geosynthetics, offshore engineering, ice, frozen ground and northern engineering, risk and reliability applications, and physical and numerical modelling. Contributions that have practical relevance are preferred, including case records. Purely theoretical contributions are not generally published unless they are on a topic of special interest (like unsaturated soil mechanics or cold regions geotechnics) or they have direct practical value.