Remediation of Contaminated Soil by Amendment of Nonhumus Soil with Humus-Rich Soil for Better Metal Immobilization

摘要

Among various soil contaminants in polluted sites, heavy metals are of great concern because of their increasing abundance in the hydrological cycle and their relative high toxicity even at low concentrations and cumulative effects. Industries causingsevere contamination of soils are the non ferrous metallurgical industry and pyrometallurgical processes (Adriano 2001). Soils are generally receiving large amounts of trace metals discharged into the aquatic ecosystem also by industrial activity (Nriagu and Pacyna 1988). Once released into the soil matrix, heavy metals have a potential impact on environmental quality and on human health through ground water and surface water (Alloway 1991). Higher concentration of heavy metals in soil may render soils non productive because of phytotoxicity and may cause bioaccumulation of heavy metals in animals and ultimately even human exposure (Abdel-Sahab et al.1994).