History of Research Project on CCA-Treated Wood Presented July 28, 2000 Florida Dept. of Environmental Protection Tallahassee, Florida.

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Presentation transcript:

History of Research Project on CCA-Treated Wood Presented July 28, 2000 Florida Dept. of Environmental Protection Tallahassee, Florida

Florida Center for Solid and Hazardous Waste Mngt. 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 Carlson Tim Franklin Brian Messick Jin-Kun Song Kristin Stook Thabet Tolaymat

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

Background The Amounts of CCA Used For Different Applications

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

The Quantities will Increase x7 Florida Disposal Statistics 3000 tons of chemical 660 tons As 350 tons chemical 77 tons As

Motivation (con’d)

Project History

Year 1 Disposal Forecast Identified Reservoirs for Disposal of CCA C&D Facilities, wood waste 6% CCA-treated A significant fraction burned through cogeneration in 1996

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

Develop Tools for Disposal End Management 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 Untreated Treated Sorting Studies Chemical stains, low capital cost labor intensive X-ray methods, high capital cost suitable for on-line system

Year 3 Alternative Chemicals Four Promising Alternative Chemicals for CCA: ACQ, CBA, CC, CDDC Most standardized for applications requiring 0.25 & 0.4 pcf CCA (Will account for approximately 60% of the treated wood volume and 20% of the chemical weight (Florida).

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 Should be distributed

Sarasota County Project On-going Sarasota County Project Year 3, Supplemental Year 4

Questions? Comments?