Neutralization of Acid Mine Drainage-influenced Lakes by Organic Additions.
Brugam-RB; Brugam-RB; Brugam-RB
NTIS: PB 91-153338 :90 pages
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.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB 91-153338
So. IllinoisUniv. At Edwardsville