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WET FGD PLACEMENT AT THE METTIKI MINE IN MARYLAND

This study examines the environmental impact of FGD (Flue Gas Desulfurization) placement at the Mettiki Mine in Maryland, including issues related to sulfur content and discharge into the Potomac River. It also discusses the injection of metal hydroxide and the FGD addition to the injection mix. The study explores the Maryland permitting issues and presents the chemical analysis of FGD and raw mine water. The overall conclusion highlights the successful treatment of acid mine drainage parameters and the reduction of contamination risk. The project's long-term goals include neutralizing mine pool acidity and providing real-life data on CCB (Coal Combustion Byproducts) interaction with acid-producing mine waters.

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WET FGD PLACEMENT AT THE METTIKI MINE IN MARYLAND

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  1. WET FGD PLACEMENT AT THE METTIKI MINE IN MARYLAND Mettiki Coal, LLC

  2. Mettiki Coal Mettiki Coal, LLC

  3. Operational Information • Began Operation in 1977 in A, B, and C mines • 1990 – 2006 D mine operated as Longwall mine • Drift mine into 8.5’ Freeport Seam Mettiki Coal, LLC

  4. Mettiki Coal, LLC

  5. Mettiki Coal, LLC

  6. Environmental Issues: • Raw Sulfur content 1.9 to 2.3 % • “Major” Maryland Discharge into the Potomac River • 7 mm gallons per day annual average discharge • + $3 mm dollar treatment facility Mettiki Coal, LLC

  7. Environmental Issues: • Raw Sulfur content 1.9 to 2.3 % • “Major” Maryland Discharge into the Potomac River • 7 mm gallons per day annual average discharge • + $3 mm dollar treatment facility Mettiki Coal, LLC

  8. Mettiki Coal, LLC

  9. Mettiki Coal, LLC

  10. Mettiki Coal, LLC

  11. Mettiki Coal, LLC

  12. Metal Hydroxide Underground Injection • Initial injection into Buffalo deep mine - 1987 • discharge pH improvement from 5.3 to 7.0 • C/B - mine injection - 1988 • raw water pH improvement from 2.9 to 4.8 • Preparation plant 200 x 0 thickener underflow added Mettiki Coal, LLC

  13. Mettiki Coal, LLC

  14. Mettiki Coal, LLC

  15. FGD addition to injection mix • February 9, 1995 DOMINION solicits for 2.25 mm tpy 10 year coal supply contract and FGD sludge removal services • August 31, 1995 VEPCO selects Mettiki to negotiate the contracts • December 1995, contracts signed Mettiki Coal, LLC

  16. Mettiki Coal, LLC

  17. VEPCO Mt. Storm Unit 3 Scrubber • General Electric forced oxidation wet limestone • Designed for 2.3% sulfur • Limestone consumption = 14 tons per hour • 100 gallons of lime slurry per 1000 ACFM flue gas • Hydroclone / Drum vacuum dewatering • 80% solids final calcium sulfate product Mettiki Coal, LLC

  18. Mettiki Coal, LLC

  19. Maryland Permitting Issues: • Hazardous Waste Program - • FGD is not considered Hazardous • 40 CFR 261.4 • COMAR 26.13.02.04-1.A(4) • Solid Waste Program - • injection does not fall under their regulations • Groundwater Discharge Program • Class 5 injection wells • Requires modification of existing NPDES permit Mettiki Coal, LLC

  20. FGD Chemical Analysis (mg/L) * Mean analytical data. Multiple tests performed using standard TCLP extraction fluid, raw mine water, and dilute sulfuric acid Mettiki Coal, LLC

  21. Raw Mine Water Analysis(mg/L) Mettiki Coal, LLC

  22. Mettiki Coal, LLC

  23. Mettiki Coal, LLC

  24. Mettiki Coal, LLC

  25. Overall Conclusion: • Application of 740,000 tons of FGD at the Mettiki A, B and C mines between 1997 and 2002 treated AMD parameters and other metal ions without increased risk of contamination from other elements • Increases were limited to soluble salt constituents: Ca, Na, K, Cl and SO4 without approaching regulatory limits Mettiki Coal, LLC

  26. Project Long Term Goals Neutralize mine pool acidity Reduce groundwater contact with pyrite and resultant acid production Provide an underutilized resource (mine voids) and reduce the surface area required for CCB storage Provide real-life data on CCB interaction with acid producing mine waters Mettiki Coal, LLC

  27. Upgraded Injection System • Dump facility • Raw mine water slurry makeup • Pumped to AMD injection tank • commingled with alkaline hydroxide sludge • 14,000 feet HDPE pipeline to 2 boreholes • Design incorporates FBC ash characteristics Mettiki Coal, LLC

  28. Mettiki Coal, LLC

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