Review On: Soil Washing Process to Remove Heavy Metals from Sludge

Soil is one of the most important components of the environment and proper management of land is very important to maintain its quality and sustained use. The soil contamination resulting from increasing release and accumulation of heavy metals in soil by industrial and other human activities cause serious threat to the functioning of components of ecosystem. Clean up or removal of pollutants from soil is very difficult task and time consuming, once contamination occurs. Soil washing is one of the few permanent treatment method to remove metal contamination from soil. Soil washing is a technology which is used to treat soils and sludges. Zinc ,chromium ,cadmium ,lead ,copper ,mercury ,nickel are considered as the most hazardous heavy metals .Soil washing provides a cost effective and environmentally proactive alternative to stabilization and land filling. This process not employed on soils that are contaminated with pesticides and volatile organic compound. Soil washing is a technique that uses liquids, usually water, to remove chemical pollutants from soil and sometimes water combined with chemical additives to scrub soils. This scrubbing cause removal of hazardous contaminants and concentrates them into smaller volume.