Injection of Fluidized Bed Combustion Ash into Mine Workings for Treatment of Acid Mine Drainage |
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Authors: | G A Canty J W Everett |
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Affiliation: | (1) CC Environmental, 1292, Norman, OK, USA 73070;(2) Rowan Univ, Civil Eng Dept, 201 Mullica Hill Rd, Glassboro, NJ, USA 08028 |
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Abstract: | Abstract A demonstration project was conducted to investigate treating acid mine water by alkaline injection technology (AIT). A total
of 379 t of alkaline coal combustion byproduct was injected into in an eastern Oklahoma drift coal mine. AIT increased the
pH and alkalinity, and reduced acidity and metal loading. Although large improvements in water quality were only observed
for 15 months before the effluent water chemistry appeared to approach pre-injection conditions, a review of the data four
years after injection identified statistically significant changes in the mine discharge compared to pre-injection conditions.
Decreases in acidity (23%), iron (18%), and aluminum (47%) were observed, while an increase in pH (0.35 units) was noted.
Presumably, the mine environment reached quasi-equilibrium with the alkalinity introduced to the system. |
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Keywords: | :" target="_blank">: acid mine drainage AMD alkaline injection technology fluidized bed combustion ash Oklahoma |
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