LYSIMETER STUDIES FOR LEACHATE CHARACTERIZATION GENERATED FROM MUNICIPAL SOLID WASTE IN PILOT SCALE LANDFILL OF BANGLADESH

摘要

This study illustrates the characteristics of leachate generated from municipal solid waste (MSW) deposited in pilot scale landfill lysimeter regarding to the variation of elapsed period and varying operational condition of landfill lysimeter. One lysimeter was simulated as open dump having no top cover and another three lysimeters were considered as sanitary landfill having top cover with different types of soil i.e. sandy loam soil, silty loam soil and clay soil, constructed at KUET campus, Khulna, Bangladesh. Distilled water with an amount equal to 50 % of the daily-recorded rainfall in 2010 was recirculated into each lysimeter once in a week. Moreover, leachate generation rate and amount, leachate characteristics as well as settlement of deposited MSW into each lysimeter at varying lysimeter operational condition were monitored. Result reveals that open dump lysimeter produced more quantity of leachate around 24 % in contrast to the sanitary landfill lysimeter. Moreover, the rate and amount of generated leachate from sanitary lysimeter shows no significant difference among them. The settlement of MSW had been found maximum in open dump lysimeter due to high generation of leachate. Result reveals that lysimeter with sandy loam soil had the lowest concentration and load of most of the pollutants, compared with the lysimeters having silty loam and clay soils as the top cover. Finally, it can be concluded that pollutants were significantly deducted in leachate, with a sandy loam soil used as a top cover in pilot scale landfill lysimeter.