History of Research Project on CCA-Treated Wood Presented January 11, 2001 Coral Gables, Florida

Funding Received from Florida Center for Solid and Hazardous Waste Mngt. Florida Power and Light and more recently from Sarasota County

Research Faculty at U.Miami Helena Solo-Gabriele, Ph.D., P.E., Assist. Professor Research Faculty at U.Florida Timothy Townsend, Ph.D., Assist. Professor David Hahn, Ph.D., Assist. Professor (focused on sorting project, LIBS expert)

Students Supported on Project  Sean Bennie  Vandin Calitu  Kelvin Gary  Naila Hosein  Bernine Khan  Monika Kormienko  Jennifer Penha  Catalina Santamaria  Jenna Jambeck Carlson  Tim Franklin  Brian Messick  Jin-Kun Song  Kristin Stook  Thabet Tolaymat

Background  CCA-Treated Wood is the most common wood preservative used today (>80% market)  CCA ---> Chromated Copper Arsenate

Background Above Ground Structural Poles Saltwater Splash Saltwater Immersion Pole/Pilings pcf = pounds of CCA per cubic foot of wood

Background  CCA ---> Chromated Copper Arsenate The treated wood contains very high concentrations of Cr, Cu, and As  As toxic, known carcinogen  Soil background levels for arsenic in Florida are low  Strict disposal guidelines

Why Was this Project Initiated?  High metals concentrations were observed in the ash from wood cogeneration facilities located in Florida

Project History

Year 1: Disposal Forecast

C&D Landfill MSW Landfill C&D Debris Recycling Facilities CCA-Wood Removed from Service Processed Wood (6% CCA in 1996) Land Application Wood Fuel Facility Ash

Year 2 Develop Tools for Disposal End Management  Leaching Studies, ash  TCLP & SPLP, Hazardous ash when CCA- treated wood represents 5% of wood burned  Solvents can extract metals from ash, citric acid very promising (40 to 100% As removed) > Explore Potential Recycling?

Year 2 (continued)  Sorting Studies, Laboratory  Chemical stains, low capital cost labor intensive  X-ray methods, high capital cost suitable for on-line system UntreatedTreated

Year 3  Alternative Chemicals  Four Promising Alternative Chemicals for CCA: ACQ, CBA, CC, CDDC  All standardized for applications requiring 0.25 & 0.4 pcf Comparable to CCA: efficacy  Leach less As but generally more Cu  Cost 10 to 30% more at retail establishment

Year 3 (Continued)  Disposal-End Management  Field Demonstration of Sorting Technologies Stains suitable for sorting small quantities of wood  Evaluation of Pyrolysis Technology Appears promising for ultimate disposal  Resource book for Wood Disposal Sector

Year 3 Supplemental  Leaching of CCA during In-Service Use  Use Sectors for CCA-Treated  Leaching of CCA-treated Wood (unburned) and C&D Debris Wood Mulch Recently Completed Results to be presented today

On-going Sarasota County Project (Innovative Recycling Grants Program) Year 4 & Year 5 (FCSHWM)

Questions? Comments?