Therefore, the subject of our research on the biological treatment of some environmental pollutants in the waters of Basrah rivers was selected by Yeast microorganisms. Not to mention the selection of these neighborhoods from the former researchers, but the focus on bacteria, algae and some fungal fungi. Global studies have shown that yeasts have a very important and important role in bioremediation in removing some environmental pollutants and producing vital compounds that have an important role in industry, medicine, agriculture and others. This Small -book is part of a doctoral thesis. The researcher's goal is the public benefit for all of the results of her study and thankfully for his generous blessing.