Immobilization and uptake of heavy metals in sewage sludge applied soils blended with lime, red mud and PSB by coriander leaves

The field experiment conducted in clay loam soil to study the effect of two levels of sewage sludge (10 t/ha and 20 t/ha) amended with lime, red mud and PSB indicated heavy accumulation of Cd, Pb and Zn to a level of 0.82, 0.78 and 1.60 mg/kg in soil but substantial reduction are observed to a level of 0.45, 0.50 and 0.70 mg/kg with lime addition. Red mud reduced these metals to a level of 0.42, 0.49 and 0.65 mg/kg, the ability of lime was due to its alkaline nature and red mud Fe/Al oxides besides alkalinity which proved more effective in the immobilization as well as reduced uptake by spinach leaves.