ABSTRACT
Heavy metals are leaching out from coal ash in the aquatic environment causing environmental pollution. In the present study the removal of heavy metals from coal ash leachate in the aquatic environment has been studied by using aquatic plants such as hyacinth, duckweed and pistia. Rhizofiltration of heavy metals was carried out at varying concentrations of coal ash starting from 0, 5, 10, 20, 30 and 40%. Simultaneously the physico-chemical parameters of leachate have been analyzed and studied to understand the leachability. Rhizofiltration has shown that pistia has high potential capacity of uptake of the heavy metals Zn, Cr and Cu and duckweed has also shown good potential for uptake of Zn, Cr and Cu next to Pistia (Table 5.3). Rhizofiltration of Zn and Cu in case of water hyacinth was lower as compared to pistia and duckweed. This research shows that pistia/duckweed/water
Pond near nuclear 137Cs, 90Sr Helianthus 90% reduction Chernobyl, disaster annuus in 2 wk; roots Ukraine (demonstration) concentrated 8,000 fold USDOE energy U Helianthus 95% removal in Ashtabula, OH wastes annuus 24 h; from 350 (demonstration) ppb to <5 ppb landfill leachate U, nitrate Brassica NA (SITE Rocky Flats, CO juncea program underway)
hyacinth can be good accumulators of heavy metals in aquatic environment.
