In your city's sewage: millions in gold, silver

February 1, 2015 1:37 PM

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In your city's sewage: millions in gold, silver

This Nov. 14, 2014 photo shows large troughs that aerate sewage at the wastewater treatment facility in Greenville, Miss. (AP Photo/The Delta Democrat-Times, Bill Johnson)

The sewage being treated by your city could be a veritable gold mine. That's because all kinds of metals end up in sewage sludge, which is the leftovers from treated sewage, Science reports.

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