Transcript AWPI Meeting, April 27

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
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Sean Bennie
Vandin Calitu
Kelvin Gary
Naila Hosein
Bernine Khan
Monika Kormienko
Jennifer Penha
Catalina Santamaria
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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
Saltwater Immersion
Pole/Pilings
Structural Poles
Saltwater Splash
Above Ground
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
35
No Change in CCA Use
25
Hypothetical Case
If 100% Alt. Chem.
Used by 2002
20
15
10
5
Today
Hypothetical Case
2044
2040
2036
2032
2028
2024
2020
2016
2012
2008
2004
2000
1996
1992
1988
1984
1980
1976
1972
1968
0
1964
Million ft3, disposed
30
Year
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
Year 2
Develop Tools for Disposal End Management
 Leaching Studies, ash
 TCLP
& SPLP, Hazardous ash when CCAtreated 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
Untreated Treated
Year 3
 Alternative Chemicals

Four Promising Alternative Chemicals for CCA: ACQ, CBA,
CC, CDDC
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All standardized for applications requiring 0.25 & 0.4 pcf
Comparable to CCA: efficacy
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Leach less As but generally more Cu
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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?