Release of Heavy Metals in the Environment

648 Words Feb 2nd, 2018 3 Pages
Day by day concentration of these metals is increasing in water supplies due to various industrial processing.
Different industries such as steel manufacturing, fertilizer and pesticide industry, leather tanning, electroplating, metallurgy, mining and smelting of metalliferous, surface finishing industry, energy and fuel production industries, electrolysis, electro-osmosis, photography, electric appliance manufacturing, metal surface treating industries are mainly responsible for releasing heavy metals into the environment , effluents of these industries are mainly loaded with heavy metals ions.
These heavy metals are very toxic for all living organisms even at very low concentration. Most common examples of heavy metals are Zinc, Cadmium, Chromium, Arsenic, Lead and Copper.
Heavy metals are classified in three categories on the basis of nature of metal and its value and these metals have higher specific weight usually more than 5.0 g/cm3 (Bishop, 2002; Volesky, 1990; Wang & Chen, 2006).
1. Toxic heavy metals including Cr, Pb, Zn, Hg, Cu, Ni, Cd, As, Co, Sn, etc.,
2. Precious metals such as Pd, Pt, Ag, Au, Ru etc.
3. Radionuclides such as U, Th, Ra, Am, etc.
Extensive research has been done in previous years for the detoxification of heavy metal ions.
There are mainly three methods available for the removal of heavy metals physical, chemical and biological.
Chemical precipitation, ion…

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