Physico-Chemical Characterization of Coal Combustion Residues From Thermal Power Plants in India

The object of this study is the coal combustion residues (CCRs) formed during coal combustion in two major thermal power stations in Rajasthan, India. This study determines physico-chemical characteristics and the content of trace elements in coal combustion residues collected from these coal fired power plants. The prevalent disposal methods used at these sites. This is crucial for the potential impact on the geoenvironment from its disposal and utilization; as coal ash has been produced in substantial amounts. The trace element concentrations in coal combustion residues are compared with those reported in literature for an indication of potential environmental implications. Both the sites are shifting from wet collection system to dry collection system which allows better utilizations of coal combustion residues but incurs additional costs. Neither of the sites uses ash pond lining in the construction of the ash pounds, hence leaching of heavy metals is possible. Better management and disposal practices coupled with increased utilization of coal combustion residues need to be undertaken to minimize the adverse impact on the geoenvironment.