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Mining for gold in unconventional places

Topic: 
WASTEWATER--SLUDGE
Author: 
Stratton-Childers, LaShell.
Publisher/Date: 
Alexandria, Va. : Water Environment Federation, 2015
Note: 
In Water Environment & Technology - Vol. 27 - no. 4 (April 2015)
Summary: 
Arizona State scientists discover that biosolids can hold millions in precious metals, including silver, copper, gold, phosphorous, iron, palladium, manganese, zinc, iridium, aluminum, cadmium, titanium, gallium, and chromium.