HDPE geomembrane-based artificial cover system for landfill in mitigating mercaptan emissions from organic waste

The emission of mercaptans during the decomposition of organic solid waste represents a significant environmental issue due to their strong odor and potential toxicity. This study aimed to explore the effectiveness of High-Density Polyethylene (HDPE) geomembrane in reducing odors produced ny mercaptans during the anaerobic decomposition of organic solid waste. The research was conducted under controlled conditions using a simulated landfill cell and employed standardrized metholologies for gas sampling and analysis. Organic waste representative of municipal solid waste composition in tropical regions was used and concentrations of methyl mercaptan and tert-butyl mercaptan were measured before and after geomembrane application using a calibrated multigas detector. Results showed a significant reduction in mercaptan levels following the implmentation of HDPE geomembrane, with concentrations decreasing from a combined 4.377 ppm to 0.696 ppm, well below established occupational exposure thresholds. Statistical analysis confirmed the reliability and significance of the results (p < 0.001). The study suggest the potential of HDPE geomembranes as an accesible and replicable solution for odor-management in solid waste treatment, particularly in resource-limited context.