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Evaluation of Thermal Processes for CCA Wood Disposal in Existing Facilities

2004 Fall TAG Meeting. Evaluation of Thermal Processes for CCA Wood Disposal in Existing Facilities. Florida Center for Solid & Hazardous Waste Management

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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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