Colloidal silver treated ceramic substrates were tested for their effectiveness in point-of-use (POU) drinking water treatment systems.  Treatment was effective in 100 ppb Ag).  High contamination scenarios were tested by supplementing with canine feces, and complete inactivation occurred within 24-48 hours.   Ag concentration increased during no-flow conditions.  Some of the silver was associated with settleable solids, while ~50% was dissolved (20 nm filtrate).  Extended flow-through experiments demonstrated that the systems maintain roughly constant Ag concentrations (Ag ~60 ppb) for three months, and the concentration was independent of hydraulic residence time.  These results indicate that colloidal silver coated ceramic substrates are an effective drinking water treatment approach, and optimization of the substrate/coating may decrease initial wash off and improve lifespan.

Assessment of colloidal silver coated substrate for small-scale drinking water treatment applications

243rd National Meeting (2012)

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