Stability and Desiccation Behaviour of Landfill Liner using Composite Materials from Textile Dewatered Sludge and Bentonite

IJEP 42(14): 1667-1676 : Vol. 42 Issue. 14 (Conference 2022)

Syafrudin, Nurandani Hardyanti, Budi Prasetyo Samadikun, Mochamad Arief Budiharjo*, Bimastyaji Surya Ramadan

Universitas Diponegoro, Department of Environmental Engineering, Faculty of Engineering, Semarang 50275, Indonesia


A landfill is equipped with a layer of retaining leachate soil (liner) to prevent leachate from polluting groundwater and the environment. This layer must have low permeability (<10-6 cm/s), preventing the leachate from entering the soil. Moreover, stability and desiccation cracks are some of the design considerations for the leachate barrier layer. In this study, composites made from dewatered sludge as the textile industry’s primary waste added with bentonite were tested to determine their ability as a leach-retaining layer in terms of stability and desiccation behaviour. Five variables were tested: V1 (80% dewatered sludge and 20% bentonite), V2 (70% dewatered sludge and 30% bentonite), V3 (60% dewatered sludge and 40% bentonite), V4 (50% dewatered sludge and 50% bentonite) and V5 (40% dewatered sludge and 60% bentonite). The stability parameters were tested using the direct shear test, which resulted in the cohesion value and the internal shear angle and the analysis was carried out using the GeoSlope/W software with the Morgenstern–Price method. Meanwhile, the drying test was undertaken by calculating the crack intensity value (CIF) or crack area in the composite using Matlab 2019a software. According to the direct shear test results, bentonite’s addition tended to increase the cohesion value and decrease the inner shear angle. Furthermore, the analysis using GeoSlope/W revealed that the bentonite in the dewatered sludge composite tended to decrease the safety factor. On the other hand, in the crack parameters, results showed that composite V1 had a relatively low CIF value, for example the CIF value obtained from the crack area was 0.77% at 27.5°C and 3.09% at 40°C. The most appropriate alternative in terms of crack intensity for composite landfill liner was composite V1 with a composition of 80% dewatered sludge + 20% bentonite.


Landfill liner, Textile dewatered sludge, Bentonite, Leachate, Groundwater


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