H&L Remediation 2011

326 views

Published on

AcuityES presentation of remediation at a site containing hexavalent chromium contamination.

Published in: Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
326
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
8
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

H&L Remediation 2011

  1. 1. In Situ Chemical Reduction of Hexavalent Chromium in Soils and Groundwater Using Ferrous Sulfide (FeS) NanotechnologyRichard H. Christensen, PhD, LPG Indianapolis, IN µg/LSteven R. IrvinJim V. Rouse (MWH)
  2. 2. Site Location -- Muncie, IN Source Areas © AcuityES 2011
  3. 3. Chrome Plating at its best! © AcuityES 2011
  4. 4. Site OverviewSite ConditionsFirst investigation – 2005 A’AcuityES - 2008Status:Equipment DeconnedBuilding DemolishedFOLLOWING SLIDES- GEOLOGY- HYDROGEOLOGY- REMEDIAL APPROACH- RESULTS A © AcuityES 2011
  5. 5. Geology FORMER BASEMENT SOURCE AREA © AcuityES 2011
  6. 6. HydrogeologyUnconfined AquiferSands & fine gravelsStatic Water at 15’ bglSaturated thickness 5’ in SE to > 25’ in NW © AcuityES 2011
  7. 7. Soil Impacts Max Cr+6 concentration: 7,900,000 µg/Kg 3,600,000 µg/Kg Cr+6 at 12’ bglTwo Adjacent Source Areas 5,400 cubic yards of impact Perched water sand stringers © AcuityES 2011
  8. 8. GroundwaterImpacts On-Site Cr+6 800,000 µg/L 9,700,000 µg/L Groundwater CoCs 66,000 sq ft Plume Cr+6, Sb, As, and Ni Offsite Cr+6 at 58,800 µg/L © AcuityES 2011
  9. 9. Selected ISCR for RemediationEnhanced what was already occurring at Site © AcuityES 2011
  10. 10. Chemical Reductant – FeSBENCH TESTED SELECTED –FeS•Ferrous Sulfide Liquid suspension of 7% FeS•CaSx FeS - With additional 2% free Sulfide to simulate CaSx•Sodium Thiosulfate•Sodium Metabisulfite Nanoscale: 98% crystals <5 microns•Zero Valent Iron Cation (Iron) & Anion (sulfide) Reaction•Organosulfates 4 H2O + Cr04 2-+ 3 Fe2- + 4 OH-  3 Fe(OH)3+ Cr(OH)3 (1) 17 H2O + 8 Cr042- + 3 HS-  3 S + 8 Cr(OH)3 + 12 OH- (2) © AcuityES 2011
  11. 11. In-Situ Soil Blending GPS Grid Network – 10’ x 10’ Deep to 15’ & Shallow to 5’Dual Axis Blender – 15’ PlungeTotal Area – 130’ x 110’ Computerized Dosing © AcuityES 2011
  12. 12. In-Situ Soil Blending Dual Axis Blender FeS - 5% admix (15 gals/yd3) © AcuityES 2011
  13. 13. In-Situ Soil Blending Thorough Mixing to 15’ BGL Note: Cement barrier for uncompaction © AcuityES 2011
  14. 14. In-Situ Soil Blending Completed in 2 weeks Total FeS = 78,300 gallons Subsequent stabilization with aglime required © AcuityES 2011
  15. 15. Confirmation Sampling © AcuityES 2011
  16. 16. Groundwater Injections – FeSTHE NUMBERS155 Inject Pts15 ft ROI3% by volume25 gals / LF6 wks complete © AcuityES 2011
  17. 17. Groundwater Injections Difficult InjectionsBoulder Fields 6’ calicheLodgement till © AcuityES 2011
  18. 18. Groundwater Injections FeS Injection Totes 35,385 gallons injected Rotosonic Drilling Top Down Injection – 5ft intervals © AcuityES 2011
  19. 19. Groundwater InjectionsCommunitySensitivity RequiredResidential Hours © AcuityES 2011
  20. 20. Preferential Flow Paths15 – 20’ bglSand Unit © AcuityES 2011
  21. 21. Preferential Flow Paths20 - 25’ bglSand Unit © AcuityES 2011
  22. 22. Pre-Treatment Cr +6 © AcuityES 2011
  23. 23. 1 st Q Post-Treatment Cr +6 © AcuityES 2011
  24. 24. 2 nd Q Post-Treatment Cr+6 © AcuityES 2011
  25. 25. 3 rd Q Post-Treatment Cr +6 © AcuityES 2011
  26. 26. On-Site Monitoring Wells - Cr+6 © AcuityES 2011
  27. 27. Off-Site Monitoring Wells - Cr+6 © AcuityES 2011
  28. 28. Summary of Cr+6 Reduction © AcuityES 2011
  29. 29. Pre-Treatment Antimony © AcuityES 2011
  30. 30. 1 st Q Post-Treatment Antimony © AcuityES 2011
  31. 31. 2 nd Q Post-Treatment Antimony © AcuityES 2011
  32. 32. 3 rd Q Post-Treatment Antimony © AcuityES 2011
  33. 33. Other Constituents of ConcernNickel – off-Site up to 4,100 µg/L on-Site up to 50,000 µg/L Same footprint as Antimony Complete 100% Reduction by 1st QuarterArsenic – Overall reduction in pervasiveness. Occurrence generally coincides with Cr+6 © AcuityES 2011
  34. 34. Lessons Learned1. Forced to use Rotosonic over direct push - Budget for the unexpected2. Chemical injection instead of GW recirculation - Can’t wear blinders when considering delivery method options for chemicals3. Agency onboard for the technology - Relationship, communication, education © AcuityES 2011
  35. 35. QUESTIONS? Thank you!! © AcuityES 2011

×