ABSTRACT
208In the present scenario, due to the discharge of large amount of metalcontaminated wastewater, heavy metals such as Cd, Cr, Cu, Ni, As, Pb, and Zn are the most hazardous among the chemical intensive industries. But here’s the problem arises. Because of their high solubility in the aquatic environments, there is a chance that that it can be absorbed by the living organisms and they enter in the food chain, which may cause severe very serious health diseases. So, one can understand why there is a need of removing these heavy metals from the industrial wastewater before sending it to the environment. There are certain conventional treatment processes available such as chemical precipitation, ion exchange, etc., but they have the disadvantages like incomplete removal, high energy requirements, and the main disadvantage that limits their use is nothing but the production of sludge of higher toxicity.
