The study looked at the characteristics of leachate in landfills in Bangladesh during different seasons. They found that the type of landfill affected the quality of the leachate, with sanitary landfills producing lower amounts of leachate and lower levels of certain pollutants compared to open dump landfills. The researchers monitored leachate generation and quality over two years and found that the operational mode of the landfill directly impacted the leachate quality. This information can help in designing better landfill liners and improving leachate treatment methods.