الفهرس 
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Abstract
The presence of heavy metals in wastewater and surface water is becoming a severe environmental and public health problem. There has been a progressive increase in the environmental load of toxic heavy metals in the past century. Chronic and acute heavy metal pollution arises from a number of anthropogenic sources, including energy production; metal mining and refining, manufacturing, agriculture, and waste disposal. To find out a good alternative to the conventional treatment method for the heavy metal containing wastewater. Isolation of the most suitable microorganism to the biosorption and bioaccumulation process in a batch as well as continuous culture for the treatment of heavy metal. In this work chromium, copper, nickel, cadmium were selected as a model for metal contamination. This selection is based on the fact that these metals are discharged in many of the industries such as electroplating, detergents, oil refining and others.