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Chemical Treatment |
| Section: NATURAL SCIENCE / AT THE EDGE |
| Author: |
| Publication: The world & I online |
| Issue Date: 2/1/2004 |
| Size: 242 Words, 1,539 Characters |
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The preferred treatment for acid mine drainage is to add acid-neutralizing chemicals--such as lime (CaCO3), sodium hydroxide (NaOH), or anhydrous ammonia (liquid NH4)--to the mine drainage wat...
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...ainage water is discharged into a receiving stream, which in the eastern United States is often slightly acidic, the receiving water can acidify any metals remaining in the discharge, releasing them as free and again-toxic ions. A second problem occurs because some of the sludge may flow out from the discharge pipe. Sludge dredged from the ponds is often pumped back into the mines.
----J.D.
(192 of 1,539 characters)
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