1 / 25

Groundwater Pilot Treatment System Update May 2017

Groundwater Pilot Treatment System Update May 2017. Agenda. Background for Pilot Treatment System Testing Pilot Treatment System Configuration Pilot Testing Results Observations / Questions Next Steps. Agenda. Background for Pilot Treatment System Testing

bdrewes
Download Presentation

Groundwater Pilot Treatment System Update May 2017

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Groundwater Pilot Treatment System UpdateMay 2017

  2. Agenda • Background for Pilot Treatment System Testing • Pilot Treatment System Configuration • Pilot Testing Results • Observations / Questions • Next Steps

  3. Agenda • Background for Pilot Treatment System Testing • Pilot Treatment System Configuration • Pilot Testing Results • Observations / Questions • Next Steps

  4. Background • Feasibility Study Analysis • Option D4 • Extraction and ex-situ treatment of high concentration impacted groundwater with re-infiltration of treated groundwater upgradient of extraction point • Agreed Order No. 2692, Amendment No. 1 • Conduct Pilot Treatability Testing • Construct and operate pilot system under Ecology oversight

  5. Agenda • Background for Pilot Treatment System Testing • Pilot Treatment System Configuration • Pilot Testing Results • Observations / Questions • Next Steps

  6. Pilot System Configuration • System Components • Groundwater extraction well • Extracted groundwater holding tanks • Walnut Shell Filter • Pretreatment metering system • Treated groundwater holding tanks • Filter backwash tanks • Re-infiltration system

  7. Agenda • Background for Pilot Treatment System Testing • Pilot Treatment System Configuration • Pilot Testing Results • Observations / Questions • Next Steps

  8. Pilot Plant Testing • Pilot System Test Program • Initial testing protocol • Fixed flowrate • ~32 gallons /minute (2.7 gpm/ft2) • Impact of pretreatment with castor oil • Two runs – 0 ppm castor oil • Two runs – 8 ppm castor oil • Two runs – 4 ppm castor oil • Process parameter • Bed Volumes (BVs) • Sampling Frequency • Initially every 50 BVs

  9. Pilot Plant Testing • Groundwater PCB Pilot Plant Testing • Testing with 0 ppm castor oil • Run 1 • ~85% PCB removal efficiency through 800 BVs • Linear drop off in efficiency to ~30% by 1,600 BVs • Backwash contained minimal PCB levels, less than 2% of loading • Run 2 • Initial removal efficiency ~80% through 50 BVs • Linear drop off in efficiency to ~30% by 1,600 BVs • Backwash contained slightly higher PCB levels

  10. Pilot Plant Testing • Groundwater PCB Pilot Plant Testing • Testing with 8 ppm castor oil • Run 3 • Dosing system initially overshot set point - ~30 ppm • Initial removal efficiency ~90% through 800 BVs • Drop off in efficiency to ~80% for 800 to 1,600 BVs • Run 4 • Initial removal efficiency ~80% through 250 BVs • Rapid drop off in efficiency to ~45% through 1,600 BVs

  11. Pilot Plant Testing • Groundwater PCB Pilot Plant Testing • Testing with 4 ppm castor oil • Run 5 • Initial removal efficiency ~70% through 200 BVs • Drop off in efficiency to ~40% for 600 to 1,600 BVs • Run 6 • Initial removal efficiency ~60% through 200 BVs • Slow drop off in efficiency to ~45% through 1,600 BVs

  12. Pilot Plant Testing

  13. Agenda • Background for Pilot Treatment System Testing • Pilot Treatment System Configuration • Pilot Testing Results • Observations / Questions • Next Steps

  14. Observations / Questions • Observations • High oil level in Run 3 may have impacted subsequent runs • Run 3 (~30 ppm) showed fairly consistent removal efficiency between 90% and 80% • Run 4 (8 ppm) started with lower initial removal efficiency, ~80%, but removal efficiency did not remain stable • Run 5 (4 ppm) started with ~70% removal efficiency but removal efficiency did not remain stable • Run 6 (4 ppm) started with ~60% removal efficiency but removal efficiency did not remain stable

  15. Observations / Questions • Observations • Extracted groundwater concentrations are highly variable with single extraction point at about a 50 gpm extraction rate • Extraction system design likely critical for maximizing concentration in extracted groundwater

  16. Observations / Questions • Questions • With oil being continuously added, why did removal efficiency drop off over time for Runs 4, 5, and 6? • Does the excess oil added in Run 3 and the stable removal efficiencies indicate that a significant oil dose rate is required? • At higher oil dose rates is there a risk of oil breakthrough to the treated water side?

  17. Agenda • Background for Pilot Treatment System Testing • Pilot Treatment System Configuration • Pilot Testing Results • Observations / Questions • Next Steps

  18. Next Steps • Groundwater PCB Pilot Plant Testing • Future testing • Castor oil additions based on Run 3 results • 15 ppm castor oil • 30 ppm castor oil • Coagulant additions • Single dose demonstration runs • System flux rate • Increase flux rate to evaluate impact on removal efficiency • Oil breakthrough of filter • Sample treated water for oil/grease

  19. Next Steps • Groundwater PCB Pilot Plant Testing • Backwash water management • Backwash treatment is the second step of the process • Need to transfer PCB to a non-water media for disposal • Backwash water testing • Bench scale testing of algae process for incorporating PCB into biomass for disposal • Awaiting full laboratory results from samples

  20. Questions?

More Related