The Study of Effective Factors on the Removal of Heavy Metals from Wastewater by Using Adsorbents Materials (Biosorbents- Natural)

Industrial wastewater have metal ions and colour compounds which can be harmful for human and animals and causing serious diseases such as cancer, damaging of nervous system, organ damage and even death. So, the removal of these materiales from waters and wastewaters is very important. Different methods have been used to remove heavy metals from wastewater such as precipitation, ion exchange, electrodialysis and reverse osmosis, that these methods are inefficient and expensive. Among these methods, adsorption is an efficient method for water treatment and wastewater decolorization, because of its low cost, easy operation, environmental friendly, high efficiency and low energy. The adsorbents used are mostly natural modified materials, agricultural waste and many micro-organism species. In this article, some of the natural adsorbents and biosorbents including bagasse, onion skin, algae, etc. have been introduced