Long-Term Effects of Municipal Solid Waste Leachate on Soil Hydraulic Properties
2025
Feten Chihi | Gabriella Varga | Katalin Kopecskó
This experimental study examines the effects of landfill leachate contamination on soil hydraulic conductivity over a 12-month period, addressing the current lack of long-term experimental data in this field. Laboratory permeability tests were performed on sandy clayey silt samples contaminated with leachate at concentrations ranging from 5% to 25%. Microstructural and mineralogical analyses were conducted using SEM and XRD to identify the mechanisms behind observed changes. The results identify a critical threshold at 15% contamination, where soil behavior transitions from granular to cohesive characteristics. Hydraulic conductivity increases at low contamination levels (5&ndash:10%, up to 1.2 ×: 10&minus:7 m/s) but decreases significantly at higher levels (4.172 ×: 10&minus:8 m/s at 15%, 8.545 ×: 10&minus:9 m/s at 20%). These changes are controlled by contamination level rather than exposure time, with values remaining stable throughout the 12-month period. The study provides essential parameters for landfill design and contamination assessment, demonstrating how leachate concentration affects long-term soil hydraulic properties through mineral formation and structural modification.
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