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Web-based Class Project on Geoenvironmental Remediation

SOIL VAPOR EXTRACTION. Web-based Class Project on Geoenvironmental Remediation. Prepared by:. Report prepared as part of course CEE 549: Geoenvironmental Engineering Winter 2013 Semester Instructor: Professor Dimitrios Zekkos Department of Civil and Environmental Engineering

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Web-based Class Project on Geoenvironmental Remediation

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  1. SOIL VAPOR EXTRACTION Web-based Class Projecton Geoenvironmental Remediation Prepared by: Report prepared as part of course CEE 549: Geoenvironmental Engineering Winter 2013 Semester Instructor: Professor Dimitrios Zekkos Department of Civil and Environmental Engineering University of Michigan Elaine Wild Adam Lobbestael With the Support of:

  2. INTRODUCTION • Remediation technique for treating contaminated soils within the vadose zone • In-situ remediation technique • Commonly used to remove volatile compounds • Petroleum • Chlorinated Products

  3. CONTAMINANT & SITE SUITABILITY • VVOCs, VOCs, and SVOCs • Low boiling point • High vapor pressure • Increase volatility of substance, Increase the ease as which SVE removes the contaminant • Effectively removes: • Petroleum (benzene, toluene, and xylenes) • Chlorinated Products (tetrachloroethene and perchloroethylene) deq.mt.gov www.arb.ca.gov www.epa.gov

  4. CONTAMINANT & SITE SUITABILITY • Soil Composition • Fine to medium sands • Permeability • High permeability (>10-6) • Groundwater Conditions • Unsaturated Zone • GW table > 10 ft bgs

  5. PREDOMINANT PROCESSES • Volatization • Dominant process of SVE • High vapor pressure • Advection • Transport of a substance through a medium • Negative pressure gradient induced by wells (USACE, 2002)

  6. PREDOMINANT PROCESSES • Diffusion • Spreading of a substance through medium • Movement due to concentration gradient • Desorption • Process where a substance is removed from a surface to the air • Movement due to a concentration gradient (USACE, 2002)

  7. DESIGN & OPERATION - Determining Applicability - (USACE, 2002)

  8. DESIGN & OPERATION - Determining Applicability - • Vapor Flow Rate • Contaminant Concentration • Location/Setting of Contaminant (Johnson et al, 1990)

  9. DESIGN & OPERATION - Pilot Scale Testing - (USACE, 2002)

  10. DESIGN & OPERATION - System Design -

  11. DESIGN & OPERATION - System Design -

  12. DESIGN & OPERATION - System Design - • Thermal Oxidation • Catalytic Oxidation • Condensation • Carbon Absorption • Resins Absorption • Biofiltration • Internal Combustion Engine • Flares • Diffuser Stacks http://us.ctp-airpollutioncontrol.com

  13. DESIGN & OPERATION - Operation & Monitoring - • Vapor Flow Rates • Pressure Readings • Vapor Concentrations and Compositions • Temperature • Water Table Levels serc.carleton.edu

  14. DESIGN & OPERATION - Operation & Monitoring - • Cost Range: $0.35/lb to $220/lb • Duration: Months to Years serc.carleton.edu

  15. ADVANTAGES & DISADVANTAGES • Advantages: • Ease of construction/readily available materials • Cost effective and relatively quick • Amenable to numerical modeling • Disadvantages: • Limited to high permeability soils • Limited to vadose zone • Ex situ applications have high exposure to contaminant

  16. More detailed technical information on this project can be found at: http://www.geoengineer.org/education/web-based-class-projects/geoenvironmental-remediation-technologies (www.rib-software.com) Department of Civil and Environmental Engineering www.rib-software.com

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