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Evaluation of Thermal Processes for CCA Wood Disposal in Existing Facilities

This study aims to evaluate thermal processes for CCA wood disposal in wood-fired capable facilities in Florida. Through an inventory of existing facilities and a survey of available pollution control technologies, the study seeks to determine facility capacity and effective control methods for emissions and leaching of heavy metals. This research will help regulatory agencies and environmental professionals make informed decisions on managing CCA wood waste.

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Evaluation of Thermal Processes for CCA Wood Disposal in Existing Facilities

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  1. 2004 Fall TAG Meeting 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-Gabriel21 University of Florida, Department of Environmental Engineering Sciences 2Miami University, Department of Civil Engineering October 22, 2004

  2. Construction & Demolition Landfill ~ 60% are Burned forEnergy Recovery 6 %CCA Wood

  3. 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

  4. Specific Goals To 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?

  5. 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) Cement plant

  6. Inventory of Combustion Facilities in Florida

  7. Inventory of Combustion Facilities in Florida (cont.)

  8. Task 2: Survey of Available Pollution Control Technologies • Mechanical collection and chemical transformation technologies from the literature and equipment vendors.

  9. 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

  10. Arsenic retained in ash from CCA wood/sorbent combustion 600 750 900 Temperature (oC) Iida et al., J. Env. Eng., 130(2), 184-192, 2004.

  11. TCLP leaching level of arsenic in ash from CCA wood/sorbent combustion

  12. XRD pattern of As2O3 with Ca(OH)2 at 1000 oC Mahuli et al., Env. Sci. Technol., 31, 3226-3231, 1997

  13. Fraction of Arsenic Leachable by TCLP for Various Mineral Sorbents Venkatesh et al., Haz. Was. Haz. Mat., 13(1), 73-94, 1996.

  14. 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.

  15. Possible Follow-Up conversion and environmental process simulator (CEPS) • Test how these materials perform in mixed fuels - field test: Energy & Environmental Research Center at University of North Dakota • Cost analysis for retrofit

  16. Pitts et al., JAWMA, 49, 1190-1200, 1999.

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