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Thermal Treatment Technology Overview – Presentation to RCCC Rhodes Remediation Projects

Thermal Treatment Technology Overview – Presentation to RCCC Rhodes Remediation Projects John Hunt, Thiess Services (Bill Troxler, Focus Environmental) August 2005. Presentation Overview. Introduction Overview - thermal treatment technologies Definitions: Thermal desorption

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Thermal Treatment Technology Overview – Presentation to RCCC Rhodes Remediation Projects

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  1. Thermal Treatment Technology Overview – Presentation to RCCC Rhodes Remediation Projects John Hunt, Thiess Services (Bill Troxler, Focus Environmental) August 2005

  2. Presentation Overview • Introduction • Overview - thermal treatment technologies • Definitions: • Thermal desorption • Types of thermal treatment systems • How do they work? • What do they look like?

  3. Overview of Thermal Treatment Technologies

  4. Thermal Treatment System Components Feed Pretreatment Feed Material Screened Debris StackGas Pretreated Solids Air Primary Thermal Treatment Unit Emissions Control Fuel Treated Soil Residuals Residuals Treatment Solids Cooling Water Treated Residuals Cooled Rehumidified Solids

  5. Technology Hazardous Waste Thermal Usage Incinerators Desorbers Mobile Projects 56 171 (1987-2001) Stationary 154 24 Facilities (2001) U.S. Thermal Treatment Technology

  6. Types of Thermal Desorption Systems • Thermal Desorbers • Directly Heated • Indirectly Heated • Emission Control Systems • Destructive-type • Recovery-type

  7. Definition of Thermal Desorption • Used to treat soils and dewatered sludges • Uses heat to vaporize organic contaminants from soil or sludge in the primary chamber • Organic contaminants transferred from soil to off-gas stream • Before the off-gas stream is released to the atmosphere it is treated either to: • destroy contaminants; or • collect contaminants for offsite treatment

  8. Types of Thermal Desorbers • Directly Heated • Indirectly Heated

  9. Mobile Thermal Desorber Projects (1987-2001) - 171 Total Hazardous Waste Projects - Directly Heated Recovery (12) Indirectly Heated Destructive (2) Indirectly Heated Recovery (72) Directly Heated Destructive (85) 10/24/01

  10. Off-gas Fuel & Air Burner Directly Heated Rotary Dryer Hot Gas Feed Soil Capacity: 20-40 tons/hr Treated Soil

  11. Directly Heated Rotary Dryer

  12. Combustion Gas Combustion Gas Combustion Gas Off-gas Rotary Dryer Burners Furnace Feed Soil Treated Soil Fuel and Air Capacity: 10-20 tons/hr Indirectly Heated Rotary Dryer

  13. Types of Emission Control Systems • Emission Destruction • most directly heated desorbers • Emission Recovery • most indirectly heated thermal desorbers

  14. Destructive Type System StackGas Water Fuel Air Fuel Air Gas Cooling Scrubbing Primary Heating Unit Thermal Oxidizer Particulate Control Soil Feed Steam Purge To Wastewater Treatment Soil Cooler Cooled Rehumidified Soil Water

  15. Solids Cooling Systems • Functions • Cool treated solids • Moisturize solids • Treat steam generated from hot solids • Types of solids coolers • Pugmills • Rotary coolers • Screw augers • Quench tank/drag belt

  16. Pugmill Hot, Dry Soil Water Steam Cooled and Rehumidified Soil

  17. Thermal Oxidizer Gas Out (760 -1,200OC) Gas In (150 - 760OC) Retention Chamber Air & Fuel Burner

  18. Packed Scrubber Gas Out Demister Packing Section Makeup Water & NaOH Gas In Water Pump Purge To Soil Cooler

  19. Recovery Type System Stack Water Air Fuel Primary Heating Unit Gas Scrubbing / Condensing Carbon Adsorption Particulate Removal Soil Feed Steam Spent Carbon Condensate Treatment Soil Cooler Organic Liquids Water Sludge Cooled and Rehumidified Soil

  20. Baghouse Gas Out Compressed Air Bags Inlet Gas Dust Discharge

  21. Quench Chamber Gas In Recycle Water Makeup Water Gas Out Purge To Soil Cooler Water Pump

  22. Condenser/Chiller Cold Fluid (Air, Water or Glycol) Cold Gas Out Chiller Hot Gas In Condenser Condensate Tank Hot Fluid

  23. Vapor Phase Activated Carbon Bed Activated Carbon Gas In Gas Out

  24. Destructive Emission Control System • None • Recovery Emission Control System • Vapor phase activated carbon • Aqueous phase activated carbon • Water containing organics • Organic liquids • Organic sludge Emission Control System Organic Residuals

  25. Soil Treatment Overview

  26. Air EmissionsOverview

  27. Types of Emissions • Stack Emissions • Fugitive Emissions from Materials • Excavation and Handling • Particulates (dust) • Organic vapors

  28. Dioxin Emissions - Rapid Quench Systems U.S. MACT Standard: 0.20 ng/dscm TEQ Dioxin Emission (ng/dscm) 0.051 ng/dscm 0.019 ng/dscm

  29. Thermal Desorption Production Time vs. Processing Capacity Indirectly Heated Processing Capacity (tonnes/hr) Directly Heated Duration (months) Based on 100,000 tonnes of soil, 80% operating factor, 7 days/wk, 24 hrs/day

  30. Thermal Desorption Summary • 33 Stationary Facilities • Proven technology (171 mobile projects) • Multiple types of thermal desorption systems • Effective for treating soils, sludges and filtercakes • Extensive stack emission data available • Highly regulated technology

  31. PART 1 THE END

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