WQI, DRASTIC and Contaminant Transport Modelling Using WiscLEACH 2.0
In the present chapter, impacts of flyash generation on local river water, ground water and river sediments are discussed. Rupnarayan river water and groundwater samples were collected from the study area and analysed for trace elements and different ions. The concentrations of different elements and ions (both in river and groundwater) were then compared with their recommended acceptable limits prescribed by WHO, IS 10500-2012 and IS 2296-1982 to assess their suitability for drinking and domestic uses respectively. Water Quality Index (WQI) and DRASTIC were applied for qualitative analyses of river water and ground water, respectively. Soil samples were collected from the surrounding areas of the ash ponds in Kolaghat and one soil sample was collected from the campus of IIT Kharagpur as the background or uncontaminated soil sample. Mineralogical compositions and trace metals concentrations in the soil and sediment samples were determined and compared with that of background soil to assess the level of land and river bed contamination. Pond ash and fly ash are used as filling materials in local roads. Since pond ash contains heavy and toxic metals, it is likely that these metals will leach from pond ash when in contact with rain water. Contaminant transport modelling of two metals, Ba and Cr from pond ash stabilized base layers of roads into the soil vadose zone and groundwater zone was done using WiscLEACH 2.0 software. The maximum concentrations of these metals and their corresponding locations in the two zones after 1, 10 and 50 years of their first leaching were predicted using this model.
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