Introduction. Soil and sludge from three former wood preserving facilities contained creosote and pentachlorophenol. Evangelista followed the request of CERCLA Section 121 to "utilize permanent solutions and alternative treatment technologies" which "permanently reduces the volume, toxicity, or mobility of hazardous substances."
Encapsulation. A type of immobilization technology, encapsulation reduces the mobility of soil-bound hazards. Evangelista first emulsified the contaminants in soil, then added a reactive silica reagent to lock these contaminants into a 3-dimensional amorphous structure. Evangelista reduced mobile total petroleum hydrocarbon TPH in soil 81% and reduced total base neutral acid extractables BNAs 77%. The TPH and BNAs in the more difficult sludge samples were reduced 57% and 49%, respectively. This was the greatest success to date to immobilize organic toxics in soil.
More Information. Studies on Samples from the PSC Industries Site, Brunswick Wood Preserve Site, and Pensacola Escambia Site, using Siallon Structured Deactivation Technology. R. Evangelista. Prepared for Roy F. Weston, Inc.
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Escambia site, Brunswick, GA
Soil screening before encapsulation
Encapsulation flow diagram
Laboratory
encapsulation of soil
Encapsulation soil samples
