One of Egypt’s major environmental issues is the disposal of solid waste. Natural clay is commonly employed to produce impermeable liners in solid waste landfills. Leachate from the waste mass can significantly affect the geotechnical properties of clay liners. In this study, the impact of hazardous industrial solid waste leachate (HISWL) on the geotechnical properties of clayey soil was investigated by using a natural clay artificially mixed with HISWL at various concentrations (0%, 25%, 50%, 75%, and 100%) to assess the potential of utilizing this clay as a barrier to line the hazardous industrial solid waste landfill. Changes in the clay structure were interpreted by detailed analyses using X-ray diffraction and scanning electron microscopy. The results revealed that there was a 10.53% percentage decrease (PD) in the plasticity index (I_P) of 100% HISWL-contaminated clay. The mixing of natural clay with 75% and 100% HISWL reduced the optimum moisture content (OMC) with a PD of 12% and 20%, respectively. The maximum dry density (MDD) of 25% HISWL-contaminated clay remained unaffected, whereas there was a slight percentage increase (PI) of 3.74% in the MDD of 100% HISWL-contaminated clay. The permeability coefficient (k) of 100% HISWL-contaminated clay significantly decreased with a PD of 78.31%. The angle of internal friction (φ) significantly decreased from 23.7° (for the natural clay samples) to 16.3° (for the 100% HISWL-contaminated samples) with a PD of 31.22%. The cohesion decreased from 33 to 22 kN/m² at 25% HISWL concentration with a PD of 33.33%. The compression index (C_C) of the clay decreased at different concentrations of HISWL. This study recommends utilizing the used clay as a liner in the event that a new hazardous waste landfill is constructed in Egypt, due to its availability and effectiveness.

中文翻译：

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危险工业固体垃圾填埋场渗滤液对黏土岩土性能的影响

埃及的主要环境问题之一是固体废物的处置。天然粘土通常用于在固体垃圾掩埋场中生产不可渗透的衬里。废物中的渗滤液会显着影响粘土衬垫的岩土性能。在这项研究中，通过使用人工混合了各种浓度（0％，25％，50％，75％和70％的HISWL）的天然粘土，研究了危险工业固体垃圾渗滤液（HISWL）对黏土土壤岩土性能的影响。 100％），以评估利用这种粘土作为危险工业固体垃圾填埋场衬砌障碍的潜力。通过使用X射线衍射和扫描电子显微镜的详细分析来解释粘土结构的变化。结果显示，可塑性指数降低了10.53％（PD）。I _P）为100％受HISWL污染的粘土。将天然粘土与75％和100％的HISWL混合可降低最佳水分含量（OMC），PD分别为12％和20％。受25％HISWL污染的黏土的最大干密度（MDD）保持不变，而受100％HISWL污染的黏土的MDD略有增加（PI）3.74％。100％受HISWL污染的粘土的渗透系数（k）显着降低，PD为78.31％。内摩擦角（φ）从23.7°（对于天然粘土样品）显着降低到16.3°（对于受100％HISWL污染的样品），PD为31.22％。在25％的HISWL浓度下，内聚力从33 kN / m ²降低至22.33N / m ²，PD为33.33％。压缩指数（C在不同的HISWL浓度下，粘土的_C）降低。这项研究建议在埃及建造一个新的危险废物掩埋场时，由于其可用性和有效性，应将用过的粘土作为衬里。