Accumulation of Cd, Pb, Zn and Ni in a calcareous soil by industrial wastewater and sewage sludge application.

heavy metals may accumulate in the soil and water and damage animals and human life cycle.The objective of this study was to determine the effects of Sewage sludge and wastewater from Polyacryle Company on accumulation of Cd, Pb, Zn and Ni under farm conditions. Three rates of sewage sludge and two types of wastewater and well water as blank were applied to the soil. The study was carried out by using a split-plot experiment with completely randomized design with three replicates. The results showed that chemical quality of the wastewater and sewage sludge according to the standards of environmental protection agency for irrigation is suitable. Heavy metals concentration significantly increased under sewage sludge and wastewater treatments at 0-20 cm depth as compared to the blank sample but this increasing is less than standards of heavy metals concentration after using in agriculture. Although a long term study about this project is necessary.