PITTSBURGH, Pennsylvania, May 7 (TNSres) -- The U.S. Department of Energy's National Energy Technology Laboratory issued the following news: Produced water that returns to the surface as wastewater after oil and gas hydraulic fracturing processes in parts of Appalachia can be a source of lithium, a valuable chemical element used in consumer products, according to an important new report from NETL. Lithium is used in rechargeable batteries for products from mobile phones, laptop computers, and   more