Injection of Coal Combustion Byproducts Into the Omega Mine for the Reduction of Acid Mine Drainage

Gray, Thomas A.; Moran, Terence C.; Broschart, David W.; Smith, G. A.

doi:10.21000/jasmr98010682

Cited by 3 publications

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“…Another technique being used after mine abandonment involves injecting alkaline materials to fill mine voids with nonpermeable materials through vertical boreholes, This technique also excludes the oxygen and water necessary for AMD formation, Mixtures of Class F fly ash and 3 to 5% portland cement have been used successfully to fill voids (Burnett et al 1995). Grouts, such as cements, clays, alkali silicates, organic polymers, and bitumen, may also be used, Grouts act as lateral or vertical barriers to decrease or stop oxygen and water infiltration, preventing AMD from forming (Ashby 1998, Gray et al 1998, Rafalko and Petzrick 1998.…”

Section: Introductionmentioning

confidence: 99%

Water Quality Improvements Over Time and Longevity of Acid Mine Discharges From Underground Mines in Northern West Virginia

Demchak¹,

Skousen²,

McDonald³

2001

ASMR

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About 90 percent of the untreated acid mine drainage in the northern Appalachian coal originates in underground mines. These mines were developed and abandoned before laws were enacted that require reclamation, sealing and closure, and water treatment. Since no one is legally responsible for treating this water, treatment may never occur and pollution from these sites will impact streams for decades. Changes in water quality from underground mine discharges over several decades was investigated, and the decay rate of sulfate discharge from these sites was evaluated. Water quality data was collected from underground mines that were sampled in 1999, and correlated to data collected during a 1968 study. The mines discharging acidity were characterized as to geology and coal seam, size of the mine, volume of coal removed during operation, age, and other factors. All eleven mine discharges improved in acidity and sulfate concentrations between the 1968 and 1999 samplings. A 2 percent decay rate was determined by I) calculating the decline of sulfate concentration between these two dates, 2) calculating sulfate declines from data of two other sources, and 3) back-calculating to the. original amount of coal remaining in the mine. This number is important because it allows for the calculation oflong-term trends of water discharging from underground mines and will help in remediation schemes.

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Section: Introductionmentioning

confidence: 99%

Water Quality Improvements Over Time and Longevity of Acid Mine Discharges From Underground Mines in Northern West Virginia

Demchak¹,

Skousen²,

McDonald³

2001

ASMR

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“…In 1998, a cooperative state, federal and privately funded grouting project was initiated to reduce or abate acidic discharges in the "North Lobe" (Fig. 1) of the mine (Gray et al, 1998;EPRI, 2001). This area comprises about 10.5 Ha, or 15% of the mined area, but was estimated to be discharging about 55% of the acid load (EPRI, 2001).…”

Section: Site Historymentioning

confidence: 99%

Long-term water quality trends in a partly flooded underground coal mine

Perry¹,

Rauch²

2004

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Abstract. Water quality trends for an 8 year period were analyzed for two acidic springs draining from a partially flooded underground coal mine, and the composite mine-pool outflow of 10 discharges. Time series analysis was used to separate long-term data trends from short-term noise. Short-term variation usually constituted less than 30 percent of the trend concentration. Exponential functions were fitted to the trend data, and time estimates (t 50C ) for concentration to decline 50% were generated for Total Acidity, Fe, Al, SO 4 , Co, Ni, and Zn concentrations. Iron decline is similar at two springs with an estimated t 50C of 60 months. Sulfate t 50C is about 60 to 70 months at one spring and for the aggregate mine-pool. Cobalt, Ni and Zn declines are more rapid, with estimated t 50C of about 30 to 50 months. Aluminum decline is 2 to 3 times slower than rates for other parameters, and mine-waters are near apparent equilibrium for the mineral jurbanite, Al(SO 4 )OH*5H 2 O. Constituent fluxes are controlled mostly by flow, and decline with time. Estimated time (t 50F ) for flux to decline 50% for the composite mine-pool outflow is about 85 months for Fe, 80 months for SO 4 and 105 months for acid flux. Fluxes are 1.5 to 3 times greater in spring than fall, and reflect seasonal distribution of precipitation and recharge to the mine. Most of the improvement in mine-pool discharge results from declining pollutant concentrations. These trends suggest a slow decline in pyrite oxidation, with significant water quality improvement occurring on the order of years to decades. Additional

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“…The collection and treatment costs to West Virginia for the AMD are $300,000 per year (T. Gray, et al 1997). …”

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confidence: 99%

Coal Combustion Ash Haulback

Gray¹,

Gray²

1998

ASMR

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Abstract. Coal mining distwbs large tracts of land which must be reclaimed. Unfortunately, iron sulphides which are common in most coals and the adjacent strata weather, forming acid mine drainage (AMD) which degrades surface and ground water. Burning of coal prodnces combustion by products, most of which are placed in ponds or landfills. Suitable disposal areas are difficult to find and permit, especially in wban areas. This has led to ash haulback -where the waste generated during coal burning is hauled back to a mine for disposal. The potential advantages of coal combustion ash haulback are:• Disposal occurs in a disturbed area (mine) rather than distwb additional land near the power plant.• The same vehicles used to haul coal from the mine can be used to return the ash to the mine.• Ash, if alkaline, may provide neutralization of acidic water· or mine oveiburden commonly found at coal mines.• Low permeability ash could reduce ground water flow through the mine backfill, thus reducing leaching of acid forming constituents or metals.Placement of ash in surface mines provides an efficient, cost-effective method of disposal while at the same time contributing to reclamation of the mine. Wise natural resource management suggests a reasonable approach to disposal of coal ash is to return it to its original location -the mine.

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Injection of Coal Combustion Byproducts Into the Omega Mine for the Reduction of Acid Mine Drainage

Cited by 3 publications

References 0 publications

Water Quality Improvements Over Time and Longevity of Acid Mine Discharges From Underground Mines in Northern West Virginia

Water Quality Improvements Over Time and Longevity of Acid Mine Discharges From Underground Mines in Northern West Virginia

Long-term water quality trends in a partly flooded underground coal mine

Coal Combustion Ash Haulback

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