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Sorting Technologies for CCA Treated Wood

Sorting Technologies for CCA Treated Wood. Objective. To design and implement an automated system to effectively sort CCA treated wood from other wood types at facilities such as C&D facilities. Automated System. Designed using x-ray fluorescence technology or

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Sorting Technologies for CCA Treated Wood

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  1. Sorting Technologies for CCA Treated Wood

  2. Objective To design and implement an automated system to effectively sort CCA treated wood from other wood types at facilities such as C&D facilities

  3. Automated System • Designed using x-ray fluorescence technology or • Designed using laser induced breakdown spectroscopy technology

  4. Motivation • CCA treated wood => ~ 6 % of all wood waste at C&D facilities • Amounts of CCA treated wood at C&D facilities increasing • At 6 % level, cannot be used as mulch or burned to generate fuel

  5. Sorting Studies • Chemical stain method • laboratory results • field results from pilot studies • X-ray fluorescence (XRF) • laboratory results • Laser Induced Breakdown Spectroscopy (LIBS) • laboratory results

  6. Automated System • X-ray fluorescence • Laser induced breakdown spectroscopy • Training and monitoring • chemical stains

  7. Chemical Stains • Chrome Azurol S • PAN Indicator • Rubeanic Acid

  8. Performance on whole wood 0.6 pcf 0.25 pcf 2.5 pcf

  9. Current Practical Applications • Sorting Small Quantities of Treated from Untreated Wood • Screening Fuel Quality • Training Tool

  10. Wood Encountered at C&D Facilities

  11. Design for Shelter

  12. Cost Estimate - Shelter • Trident $9,600 - $11,500

  13. Update on Building • Tasks & Timeline • Current Contacts

  14. Timeline Get Building ContractorUnder Contract 1 Wk 2 Wk 1 Wk 3 D 4-6 Wks Building ContractorDevelops Design Drawing Team ReviewsDesign ? Wks Building ContractorSeals Building Design Apply for Permit Building Fabrication Concrete Slab Erect Building

  15. Building Contractors Contacted • Trident -- Met with on June 7 • Estimate: $9,600 - $11,500 • Anderson and Ellis Construction • Job too small • Bob Howard Construction • Contacted • John F. Swift, Inc. • Contacted

  16. Concrete Contractors Contacted • Fred Derr Concrete • Prestige Concrete • John F. Swift

  17. Initial Detector Mounting Design

  18. Conveyor Design #1 Movable holding arm Wood Piece Table

  19. Movable holding arm Wood Piece Table Top View 3/4 “ to 2”

  20. Movable holding arm Wood Piece Conveyor Surface X-rays Detector mounting Cross-Sectional View

  21. Cost Estimates – Conveyor • American Conveyor, Miami $11,038 • Powerscreen, Lakeland $24,500

  22. Conveyor Design #2 Holding arm Wood Table X-ray

  23. Top View Wood Table

  24. XRF • Based on emission of x-rays • Characteristic x-ray emitted by the element is read by the instrument

  25. Model 400 • No special training required • User friendly • Printout or output easy to read and understand Analyzer Head

  26. XRF Instruments • Low maintenance, few consumables, easy cleaning • No repetitive calibration necessary (6 mo. to 2 yrs.) • Life span of 10 years

  27. XRF Instrument • Cost range from $20,000 - $100,000 • Detector replacement cost of $1,800 - $2,400 (life span of 5 years) • Licensing may be required • Sensor protected by a small beryllium window ($100 for replacement)

  28. Results of XRF Studies • Arsenic is the best indicator metal, although all three metals can be analyzed for • Optimum count time of 2 seconds, would be even less for on-line analysis 1,800 ft/hr for detection of 1-ft board (2 s) 3,600 ft/hr for detection of 1-ft board (1 s) • Detection of CCA for Model 400 is possible at 1 inch distance with a plastic shield

  29. X-Ray Technology • Analysis Time < 2 seconds • Best Metal for Analysis, As • Largest Separation Between Sample and Detector is 1 inch

  30. XRF - Collaboration • ASOMA Inc (1 inch diameter face & strip model) • Jordan Valley (Hand-held unit, 3 in x 3 in face)

  31. Laser Technology • Analysis Time < 1 second • Best Metal for Analysis, Cr • Tolerance, 12 inches

  32. On-line Sorting Technologies

  33. Laser-induced Breakdown Spectroscopy (LIBS)

  34. Sample Configuration of LIBS Probe

  35. Experiments with LIBS • Sample 1: 0.25% CCA • Sample 2: 2.5% CCA • Sample 3: Weathered CCA • Sample 4: Weathered Utility Pole • Sample 5: New untreated • Sample 6: Weathered untreated

  36. LIBS Spectrum of CCA-treated Wood

  37. LIBS-based Sorting

  38. Questions?

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