摘要：Groundwater is the main source of water for domestic, industrial and agricultural consumption and its contamination has been recognized as one of the most severe issues in the recent times. The present study is focused on the monitoring of leachate contamination and groundwater quality around the uncontrolled MSW landfill sites located at Ramna village of Varanasi city, during pre and post-monsoon. On the basis of physico-chemical analysis of groundwater, it was found that EC, TDS, hardness, nitrate and Fe contents were higher than the standard value of drinking water quality in both pre and post-monsoon periods. Leachate pollution index (LPI) and water quality index (WQI) were used to quantify the contamination in leachate and groundwater respectively. Higher value of LPI (12.40) revealed the significant concentration of pollutants present in the landfill leachate. Water quality index (WQI) was calculated for water samples of different wells located near landfill sites and it was integrated with geographical information system (GIS) for spatial mapping to identify the status of water quality in the studied area. Groundwater modelling was done and path line and velocity vector of groundwater flow was generated. Relationship between LPI, WQI and flow path are used to predict the water contamination in groundwater due to percolation of leachate from open uncontrolled landfill site. Results were validated with field observations. The present study would be helpful for landfill strategy makers and the government authorities to safeguard the groundwater pollution risk from the landfill.
关键词：Groundwater pollution;Municipal landfill;Leachate pollution index;Water quality index
