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Neutralization of Acid Mine Drainage-influenced Lakes by Organic Additions.

Brugam-RB; Brugam-RB; Brugam-RB

NTIS: PB 91-153338 :90 pages

10009121

In a series of five experiments, 1-m-diameter and 3- to 6-m-long cylindrical enclosures were built in an acidic lake on a coal mine site. The enclosures extended from the lake surface to the sediment. We added limestone, phosphate, sewage sludge, or wheat straw to the enclosures to test their neutralizing capabilities. Theory suggests that sewage sludge and wheat straw should be substrates for sulfate reduction by bacteria and that the production of h2s and its precipitation as fes should remove sulfuric acid from the water column. The limestone additions raised ph as expected. Straw additions supported sulfate reduction. Sulfate reduction was strongest where both lime and straw were added together. Straw additions produced the expected neutralization in our experiments, but neutralization was not permanent. We speculate that the production of chelating substances from the decaying straw prevented the precipitation of fes. Iron concentrations remained high in straw enclosures even though sulfide concentrations were also high.

19900101

CP; Final Contract Report;

1990

PB91-153338

A06

OFR 11-91

PRC;

NTIS: PB 91-153338

IL;

So. IllinoisUniv. At Edwardsville