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" ... Image reprinted with permission from The American Chemical Society: Characterization, recovery... [+] opportunities, and valuation of metals in municipal sludges from U.S. wastewater treatment plants nationwide, copyright Jan. 1, 2015, by Westerhoff, P., S. Lee, Y. Yang, G. W. Gordon, K. Hristovski, R. U. Halden and P. Herckes. ... "