لخّصلي

Heavy metals play an important role in the metabolic processes of the biota, some of them are essential for organisms as micronutrients such as cobalt, chromium, nickel, iron, manganese and zinc They are involved in redox processes, to stabilize molecules through electrostatic interactions, as catalysts in enzymatic reactions, and regulating the osmotic balance.It can effectively sequester dissolved metal ions out of dilute complex solutions with high efficiency and quickly, therefore it is a suitable candidate for the treatment of high volumeand low concentration complex heavy metal wastes

(Wang and Chen, 2006).The present study aimed to isolate S. oneulensis from soil and identifying it biochemically and molecularly, in addition to determining their ability to remediation Pb and Cd through biosorption processes.Physicochemical methods have been used, such as electrochemical treatment, ion exchange, precipitation, reverse osmosis, evaporation, and

sorption (Congeevarama et al., 2007).Thus, bioremediation affords a substitute to destroy estroy or reduce the harmful contaminants through biological activity and this method is cost effective (Salem et al., 2012).

Heavy metals play an important role in the metabolic processes of the biota, some of them are essential for organisms as micronutrients such as cobalt, chromium, nickel, iron, manganese and zinc They are involved in redox processes, to stabilize molecules through electrostatic interactions, as catalysts in enzymatic reactions, and regulating the osmotic balance. On the other hand, cadmium, mercury, lead, has no biological role and are harmful to the organisms even at very low concentration. However, at high levels, both of the essential and non essential metals become toxic to the organisms (Rathnayake et al., 2010). Heavy metals can produce harmful effects on human health when they are taken up in amounts that cannot be processed by the organism. In addition, these metals cannot be degraded to harmless products and hence persist in the environment indefinitely. For these reasons several methods havebeen designed for the treatment and removal of heavy metals in contaminated site (Akhtar et al., 2013). Physicochemical methods have been used, such as electrochemical treatment, ion exchange, precipitation, reverse osmosis, evaporation, and

sorption (Congeevarama et al., 2007). Bioremediation is a natural process which depends on bacteria, fungi, and plants to change pollutants as these organisms carry out their normal life functions. These organisms have the ability of using chemical contaminants as an energy source for their metabolic processes. Thus, bioremediation affords a substitute to destroy estroy or reduce the harmful contaminants through biological activity and this method is cost effective (Salem et al., 2012). Biosorption exploits various certain natural materials of biological origin, including bacteria, fungi, yeast, algae, etc. It can effectively sequester dissolved metal ions out of dilute complex solutions with high efficiency and quickly, therefore it is a suitable candidate for the treatment of high volumeand low concentration complex heavy metal wastes

(Wang and Chen, 2006). The present study aimed to isolate S. oneulensis from soil and identifying it biochemically and molecularly, in addition to determining their ability to remediation Pb and Cd through biosorption processes.