Environmental toxicology: Removing nano silver from wastewater
Nanosilver in wastewater can cause severe environmental damage if it occurs as a metal. A new study shows that nanosilver is quickly transformed into less problematic substances on its way to the wastewater treatment plant. In addition, it is efficiently retained in the sewage sludge so that only a small portion of it reaches the water systems.
The researchers were also able to show that approximately 95% of the nanoparticles are bound in the sewage sludge. Only 5% of the silver remains in the treated water. This percentage could be further reduced by using better particle filters. Venturing into the nano dimension would not be necessary, though: the sulfidised nanosilver aggregates almost entirely on large particles in the wastewater. With a reasonable effort, they could be removed more efficiently from the wastewater than is presently the case.
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