US EPA

1384125 

Technical Report 

Characterization and two-phase neutralization of acid mine drainage 

Chung J-B; Jeong B-R 

1999 

BIOSIS/99/17113 

42 

1 

73-78 

eng 

BIOSIS COPYRIGHT: BIOL ABS. Acid mine drainage (AMD) results from sulfuric acid produced by the oxidation of pyrite, and contains large amounts of toxic elements. In the neutralization of AMD, iron and aluminum hydroxides are the major precipitates and those two can be separated with two-phase neutralization. In this study, removal of toxic elements by the two phases of neutralization was investigated using an AMD collected from the abandoned antimony mine in Gachang, Taegu. Contents of As, Cd, Cu, Mn, Pb and Zn in the AMD of Fe and Pb were removed but levels of As, Cd, Cu, Ni, Mn, and Zn were not reduced in the supernatant solution. In the second phase neutralization, levels of those toxic elements in the supernatants dropped below the wastewater discharge or river water quality criteria. This result suggests that the precipitate formed in the first phase of the neutralization process may be disposed without any special cares. Thus the two-phase neutralization scheme can reduce the cost of dispos 

Comparative Biochemistry; Biochemical Methods-Minerals; Biochemical Studies-Minerals; Toxicology-Environmental and Industrial Toxicology; Public Health: Environmental Health-Sewage Disposal and Sanitary Measures; Public Health: Environmental Health-Air