Treatment of acid mine drainage

Journal Article · Sun Mar 01 00:00:00 EST 1981 · Ind. Wastes (Chicago); (United States)

OSTI ID:5466679

Throop, W M

A process for neutralising acid mine drainage waters in a large Pennsylvanian coal mine operation is described. Lime slurry (hydrated lime for lower acidity and quicklime for higher acidity) at a concentration of 5% is added to maintain a pH of 8.0 to 9.5. Aeration oxidises ferrous iron to ferric iron, using 1 mg/l oxygen for each 14 mg/l ferrous iron. After the 15-30 min mixing and aeration, solids are coagulated with paddle wheels or turbine flocculators. The subsequent clarification process using an anionic polyelectrolyte (0.5 to 2.0 mg/l) collects the lime sludge and conveys it to a detention basin. Sludge is usually dumped into an abandoned mine.

• OSTI ID: 5466679
• Journal Information: Ind. Wastes (Chicago); (United States), Vol. 27:2
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ACID MINE DRAINAGE
WATER TREATMENT
COAL MINES
CALCIUM HYDROXIDES
CALCIUM OXIDES
PENNSYLVANIA
PH VALUE
SLUDGES
USA
WATER POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
CONTROL
FEDERAL REGION III
HYDROGEN COMPOUNDS
HYDROXIDES
MINES
NORTH AMERICA
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
UNDERGROUND FACILITIES
010800* - Coal
Lignite
& Peat- Waste Management
012000 - Coal
Lignite
& Peat- Mining