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Supercritical Water Treatment of Creosote-Treated Wood Waste

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Supercritical Water Treatment of Creosote-Treated Wood Waste. Todd F. Shupe W. James Catallo. IUFRO All Division 5 Conference 29 October – 2 November, 2007 Taipei, Taiwan. Main Research Objective. - PowerPoint PPT Presentation
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Supercritical Water Supercritical Water Treatment of Creosote- Treatment of Creosote- Treated Wood Waste Treated Wood Waste Todd F. Shupe Todd F. Shupe W. James Catallo W. James Catallo IUFRO All Division 5 Conference IUFRO All Division 5 Conference 29 October – 2 November, 2007 29 October – 2 November, 2007 Taipei, Taiwan Taipei, Taiwan
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Page 1: Supercritical Water Treatment of Creosote-Treated Wood Waste

Supercritical Water Treatment of Supercritical Water Treatment of Creosote-Treated Wood WasteCreosote-Treated Wood Waste

Todd F. ShupeTodd F. Shupe

W. James CatalloW. James Catallo

IUFRO All Division 5 ConferenceIUFRO All Division 5 Conference29 October – 2 November, 200729 October – 2 November, 2007

Taipei, TaiwanTaipei, Taiwan

Page 2: Supercritical Water Treatment of Creosote-Treated Wood Waste

Main Research ObjectiveMain Research Objective

To develop a complete closed-loop recycling To develop a complete closed-loop recycling system to achieve zero discharge of wood system to achieve zero discharge of wood preservatives into the waste stream. The system preservatives into the waste stream. The system must be must be economically viableeconomically viable and and environmentally environmentally friendly.friendly.

Page 3: Supercritical Water Treatment of Creosote-Treated Wood Waste

Recycling PotentialRecycling Potential

•There is a need for extensive research into ways of reducing, reusing, recycling, and disposing of treated wood in environmentally acceptable ways (Cooper 1994).

Page 4: Supercritical Water Treatment of Creosote-Treated Wood Waste

The PresentThe Present

It has been estimated that about 5 million It has been estimated that about 5 million tons of spent preservative treated wood is tons of spent preservative treated wood is disposed of annually into landfills in the disposed of annually into landfills in the United States (Falk 1997).United States (Falk 1997).

Page 5: Supercritical Water Treatment of Creosote-Treated Wood Waste

Industrial ApplicationsIndustrial Applications

““Green” recyclingGreen” recycling Rural economic developmentRural economic development

Page 6: Supercritical Water Treatment of Creosote-Treated Wood Waste

Preservatives StudiedPreservatives Studied

Copper chromium arsenic (CCA)Copper chromium arsenic (CCA)

CreosoteCreosote Oil-borne pentachlorophenol (penta)Oil-borne pentachlorophenol (penta)

Page 7: Supercritical Water Treatment of Creosote-Treated Wood Waste

Supercritical WaterSupercritical Water

Supercritical (SC) water (>374 Supercritical (SC) water (>374 ooC/221 bar) C/221 bar) under anoxic and reducing conditions has under anoxic and reducing conditions has been used for a variety of synthetic been used for a variety of synthetic chemical transformation/recycling chemical transformation/recycling purposes. purposes.

Page 8: Supercritical Water Treatment of Creosote-Treated Wood Waste

Supercritical WaterSupercritical Water

The SC phase is one of the most energetic The SC phase is one of the most energetic and chemically dynamic conditions known and chemically dynamic conditions known for aqueous systems, including a) liquid for aqueous systems, including a) liquid water under conditions normally observed, water under conditions normally observed, b) very high pressures and, c) superheated b) very high pressures and, c) superheated steam.steam.

Page 9: Supercritical Water Treatment of Creosote-Treated Wood Waste

Creosote MethodsCreosote Methods

1mm particle size1mm particle size pH 10pH 10 400 400 10 10 ooC/280 bar for 15 hrs. including C/280 bar for 15 hrs. including

heat up and cool downheat up and cool down

Page 10: Supercritical Water Treatment of Creosote-Treated Wood Waste

Fresh CreosoteFresh Creosote

Page 11: Supercritical Water Treatment of Creosote-Treated Wood Waste

Weathered CreosoteWeathered Creosote

Page 12: Supercritical Water Treatment of Creosote-Treated Wood Waste

After 12 h SC TreatmentAfter 12 h SC Treatment

Page 13: Supercritical Water Treatment of Creosote-Treated Wood Waste

Fresh Creosote Weathered Creosote

“Regenerated” Creosote

After 12 h SC Treatment

Page 14: Supercritical Water Treatment of Creosote-Treated Wood Waste

Creosote ResultsCreosote Results

During treatment, the creosote-derived During treatment, the creosote-derived hydrocarbon residues in the wood were hydrocarbon residues in the wood were nearly completely (>99%) recovered and nearly completely (>99%) recovered and the wood itself was transformed into a the wood itself was transformed into a mixture of hydrocarbons including mixture of hydrocarbons including substituted benzenes, phenolics and light substituted benzenes, phenolics and light PAHs. PAHs.

Page 15: Supercritical Water Treatment of Creosote-Treated Wood Waste

Creosote ResultsCreosote Results

These wood-derived transformation These wood-derived transformation products served to reconstitute the "light products served to reconstitute the "light end" of the creosote, which largely had end" of the creosote, which largely had been lost while in service. been lost while in service.

Page 16: Supercritical Water Treatment of Creosote-Treated Wood Waste

Creosote ResultsCreosote Results

Thus, the hazardous waste (creosote Thus, the hazardous waste (creosote hydrocarbon mixture) was recovered, and hydrocarbon mixture) was recovered, and the solid waste (wood) was transformed into the solid waste (wood) was transformed into a complimentary product mixture in a a complimentary product mixture in a single pass. Solid residues after 12-20 h of single pass. Solid residues after 12-20 h of treatment were <2% w/w.treatment were <2% w/w.

Page 17: Supercritical Water Treatment of Creosote-Treated Wood Waste

ConclusionsConclusions

Creosote - The hazardous waste (creosote Creosote - The hazardous waste (creosote hydrocarbon mixture) was recovered, and hydrocarbon mixture) was recovered, and the solid waste (wood) was transformed into the solid waste (wood) was transformed into a complimentary product mixture in a a complimentary product mixture in a single pass forming a “recycled” creosote.single pass forming a “recycled” creosote.

Page 18: Supercritical Water Treatment of Creosote-Treated Wood Waste

Current ResearchCurrent Research

Detoxification of mixed treated wood types Detoxification of mixed treated wood types (no sorting of different preservatives)(no sorting of different preservatives)

KineticsKinetics Gas phase analysisGas phase analysis Efficacy testing of “recycled” creosoteEfficacy testing of “recycled” creosote

Page 19: Supercritical Water Treatment of Creosote-Treated Wood Waste

School of Renewable Natural ResourcesLouisiana State UniversityRm. 111 Renewable Natural Resources Bldg.Baton Rouge, LA 70803-6202

phone: (225) 578-6432fax: (225) 578-4251

http: http://www.rnr.lsu.edu/e-mail: [email protected]

Contact Us

Page 20: Supercritical Water Treatment of Creosote-Treated Wood Waste

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