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Passive treatment of coal mine drainage.
Hedin RS; Narin RW; Kleinmann RLP
USBM 1993 Oct; :1-35
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.
Metal-compounds; Metal-poisoning; Metals; Environmental-contamination; Environmental-pollution; Environmental-protection
NTIS Accession No.
Bureau of Mines
Page last reviewed: October 1, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division