The power generation in India was about 2, 00,000 x 106 Watt in 2012 and expected to increase up to 3, 00,000 x 106 Watt by 2017 [1]. About 54.09 percent of electricity is generated from coal based thermal power plants. The present fly ash generation rate is about 131.09 x 106 tonnes per annum and utilization rate is 73.13 x 106 tonnes per annum [1]. The unmanaged disposal of such huge quantity of fly ash is major problem, probably the leaching of pollutants into surface and ground water. Groundwater and soil contamination is a common issue at ash ponds and landfill sites. Contaminants such as iron, chromium, nickel, lead, and cadmium can dissolve from soil and waste material into groundwater in a process known as leaching.

The impact of coal ash leachates on receiving waters, cause changes in water pH with implications for trace element mobility [2]. In wet disposal system the fly ash is mixed with water and the slurry is discharged into ash ponds or lagoons. The supernatants of ash ponds are then discharged into a receiving system like a river/canal.