Treatment of landfill leachate by the physico chemical methods

Abstract

Treatment of landfill leachate is the challenge of all developing countries around the world in present day’s for environmental scientists because direct impact of environmental protection cost is unaffordable to those developing countries. However, intangible benefits of such treatment, creates demand for better techniques. Due to this research is needed toward economic means of protecting the environment. The effort made in this research into the treatment of landfill leachate is a step towards this goal. This work is the study of analysis Leachate Pollution Index (LPI) of 15 parameters and adsorption combined with physico-chemical method to treat landfill leachate. Treatment of landfill leachate by physico chemical methods with lime, air stripping, chemical coagulation does not comply with the discharge standards set by DoE on ECR, 97. Use of adsorption process with GAC (Granular Activated Carbon) has been proven to improve the leachate treatment efficiency. At present there is only biological treatment process in Matuail Landfill site. Recent studies have shown that only biological treatment at Matuail landfill leachate is not sustainable to meet the discharge standard to environment. It is very urgent to take some steps to encounter the problem of ground water pollution with a convenient option. The aim of this study is to analyze a suitable treatment method for landfill leachate in a cost effective manner. This study also focuses on quantifying the leachate contamination potential on a comparative scale by LPI and the efficiency of adsorption by GAC. Whereas LPI shows that chemical treatment only is not effective. Efficiency of the used treatment process in terms of COD, BOD, NH3-N, heavy metals removals from leachate is mainly studied. Analysis of LPI at different treatment stage and discharge standards provided by DoE on ECR, 97 also carried out. The LPI at different treatment stages are 22.277(Raw Sample), 20.435 (Air Stripping), 13.292 (Alum Coagulation), 5.527 (GAC Adsorption). Those results are showing that pollution load is declining.