There's Gold In Them Thar Sewage Pipes, Swiss Researchers Say

There's Gold In Them Thar Sewage Pipes, Swiss Researchers Say
Researchers collect a sample at the Werdhölzli wastewater treatment plant in Zurich, as part of an Eawag research project exploring the concentration of various metals in treated wastewater.

Each year, more than $3 million in gold and silver winds up in Swiss wastewater, scientists found. But in most cases, it doesn't make economic sense to extract and recycle the metals.

(Image credit: Elke Suess/Eawag)