Evaluation of Thermal Processes for CCA Wood Disposal in Existing Facilities Florida Center for Solid & Hazardous Waste Management Anadi Misra 1 , Chang-Yu Wu 1 , Timothy Townsend 1 , Helena Solo-Gabriel 2 1 University of Florida, Department of Environmental Engineering Sciences 2 Miami University, Department of Civil Engineering October 22, 2004 2004 Fall TAG Meeting
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Evaluation of Thermal Processes for CCA Wood Disposal in Existing Facilities Florida Center for Solid & Hazardous Waste Management Anadi Misra 1, Chang-Yu.
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Evaluation of Thermal Processes for CCA Wood Disposal in Existing Facilities
Florida Center for Solid & Hazardous Waste Management
Anadi Misra1, Chang-Yu Wu1, Timothy Townsend1, Helena Solo-Gabriel2
1 University of Florida, Department of Environmental Engineering Sciences2Miami University, Department of Civil Engineering
October 22, 2004
2004 Fall TAG Meeting
Construction & Demolition Landfill
6 %CCA Wood
~ 60% are Burned for
Energy Recovery
Incineration of CCA Wood
• Heavy Metal Emissions from combustion– Volatilization and entrainment
• Leaching of Heavy Metals from Ash into Groundwater– A hidden problem often ignored
Specific GoalsTo evaluate thermal processes for CCA
wood disposal in wood fired capable facilities in the state of Florida
• How many facilities are available for thermal process of CCA treated wood in the state of Florida?
• What is the capacity of each viable facility? • What technologies are available for effective
control of emission and leaching of the metals?
MethodologyTask 1: Inventory of Existing Wood-Fired
Capable Facilities • Facilities that use wood as their fuel • Facilities can possibly be converted to burn
wood (e.g. cement kilns, coal fired power plants, waste-to-energy plants)
Inventory of Combustion Facilities in Florida (cont.)
Task 2: Survey of Available Pollution Control Technologies
• Mechanical collection and chemical transformation technologies from the literature and equipment vendors.
Task 3: Screening of Potential Materials for Preventing Arsenic Leaching from Incineration Product
• Potential mineral sorbents evaluated in a bench-scale incinerator
• Ash will be analyzed according to TCLP for leaching properties and XRD to identify the crystalline composition
Arsenic retained in ash from CCA wood/sorbent combustion
600 750 900Temperature (oC)
Iida et al., J. Env. Eng., 130(2), 184-192, 2004.
TCLP leaching level of arsenic in ash from CCA wood/sorbent combustion
XRD pattern of As2O3 with Ca(OH)2 at 1000 oC
Mahuli et al., Env. Sci. Technol., 31, 3226-3231, 1997
Fraction of Arsenic Leachable by TCLP for Various Mineral Sorbents
Venkatesh et al., Haz. Was. Haz. Mat., 13(1), 73-94, 1996.
Impact if Specific Objectives Are Met
• Regulatory Agencies: establish pertinent strategy for better management of CCA wood disposal
• Environmental professionals: make an informed decision on the best option for managing their CCA wood waste through better understanding of the cost-effectiveness and applicability of the alternative technology.
Possible Follow-Up
• Test how these materials perform in mixed fuels - field test: Energy & Environmental Research Center at University of North Dakota
• Cost analysis for retrofit
conversion and environmental process simulator (CEPS)