Formulation of Sub-Pollution Indices and Evaluation of Leachate Pollution Index of Pilot Scale Landfill Lysimeter

The principal concern of this study is to formulate the sub-pollution indices (sub-LPIs) and evaluate the individual and overall leachate pollutant index (LPI) of pilot scale landfill lysimeter at KUET campus, Bangladesh. To these endeavors, leachate samples from collection chamber of landfill lysimeter were sampling and the relevant parameters required for evaluating LPI were measured and monitored in the laboratory. Both the open dump and sanitary landfill conditions having a base liner and two different types of cap liner were simulated. Three sub-LPIs in terms of LPI in organic pollutant (LPI ), LPI or in inorganic pollutant (LPIin) and LPI in heavy metals (LPIhm) as well as overall LPI had been developed and reported. It can be noted that component of organic fraction in leachate for entire lysimeter operating system had highest against the other counter fraction i.e. inorganic and heavy metals fraction and consequently shows the highest LPIor than that of LPIin and LPIhm. it can be observed that sub-LPIs and overall LPI has decreased in relation to the increasing of elapsed period of MSW deposited in landfill lysimeter. Results showed that collection system of sanitary lysimeter-A had the highest sub-LPIs and overall LPI than that of other lysimeter operating systems. Finally, it can be monitored that overall LPI was significantly high for entire lysimeter operating systems and proper treatment will be necessary before discharging the leachate into the water bodies.