wet fgd placement at the mettiki mine in maryland l.
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WET FGD PLACEMENT AT THE METTIKI MINE IN MARYLAND. Mettiki Coal, LLC. Mettiki Coal. Mettiki Coal, LLC. 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.

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slide2

Mettiki Coal

Mettiki Coal, LLC

slide3

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

slide6

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

slide7

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

slide14

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

slide17

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

slide19

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

slide21

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

slide22

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

slide27

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

slide29

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

slide30

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