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Passive treatment of coal mine drainage.

Authors
Hedin-RS; Narin-RW; Kleinmann-RLP
Source
USBM 1993 Oct; :1-35
Link
NIOSHTIC No.
10012349
Abstract
Passive methods of treating mine water use chemical and biological processes that decrease metal concentrations and neutralize acidity. Compared with conventional chemical treatment, passive methods generally require more land area, but use less costly reagents and require less operational attention and maintenance. Currenlty, three types of passive technologies exist: aerobic wetlands, organic substrate wetlands, and anoxic limestone drains. Aerobic wetlands promote mixed oxidation and hydrolysis reactions, and are most effective when the raw mine water is net alkaline. Organic substrate wetlands promote anaerobic bacterial activity that results in the precipitation of metal sulfides and the generation of bicarbonate alkalinity. Anoxic limestone drains generate bicarbonate alkalinity and can be useful for the pretreatment of mine water before it flows into a wetland.
Keywords
Metal-compounds; Metal-poisoning; Metals; Environmental-contamination; Environmental-pollution; Environmental-protection
Publication Date
19931001
Document Type
Information Circular
Fiscal Year
1994
NTIS Accession No.
PB94-173341
NTIS Price
A07
Identifying No.
IC-9389
Source Name
Bureau of Mines
State
PA
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