Drozdz, Susan A., Vincent F. Hock, Alva Daniels, Patrick J. Clark, John R. Kominsky. REMOVAL AND STABILIZATION OF LEAD-BASED PAINT WITH AN ENGINEERED ABRASIVE
U.S. Army ERDC, P.O. Box 9005, Champaign, IL 61826-9005 (v-hock@cecer.army.mil)
U.S. EPA NRMRL
Environmental Quality Management, Inc.
A novel process was developed to chemically stabilize lead paint waste in-situ and immobilize the lead ions in a calcium silicate-based cementitious matrix. When used with abrasive blasting,, the engineered abrasives reduce lead leachability to below the regulatory threshold of 5 ppm.
A calcium silicate-based material is added to abrasive media at a rate of 20-25% by weight. No equipment modifications are required, and the high production rates of abrasive blasting remain. The lead is stabilized through the formation of complex lead silicates upon wetting. The water can be added to the spent abrasive or through a wet abrasive blast process. The waste will not be characterized as hazardous.