The degradation of organic compounds in municipal solid waste (MSW) in landfills could emit harmful methane gas (CH4), which is responsible for over 25% of global warming. This study aims to evaluate the geotechnical effects of using compost-wastewater sludge-natural clay as a daily landfill cover in tropical landfills. Biocover is a potential approach to reduce CH4 emissions from landfills in tropical areas like Brunei Darussalam. Biocover is rich in microbes that are capable of naturally oxidising released CH4. They are much less expensive to install and operate. In this study, the compaction, consolidation, and desiccation cracking properties of four different biocover compositions were investigated in accordance with BS 1377:2018. Compositions of biocover (compost: wastewater sludge: clay) were studied at 0:0:100 (Composition A), 20:5:75 (Composition B), 45:5:50 (Composition C), and 70:5:25 (Composition D) ratios. From a geotechnical standpoint, composition D was found to be more suitable as biocover due to its compactness; its permeability was within the permissible limit of 1×10−9 m/s, and it could sustain heat at 30°C better than clay, with a reduction in average total cracked area of 51.32%-58.82% less than clay.
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