Water
Pollution: Acid Mine Drainage: Remediation Note the color change in the treatment pond pictured above. The water is red where mine effluent enters the pond. The red color is the iron hydroxide precipitating out of the water. Mechanical aeration (mixing the water) speeds the process by making more oxygen available. (See reactions 1 and 3 in "AMD Chemistry"). The iron hydroxide precipitate eventually settles to the bottom of the pond. This is the area where the red water turns green. The green color is a result of sulfate (SO42-), sodium (Na+), and calcium (Ca2+) ions remaining in the water after acid neutralization reactions occur.
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