||Static coal storage : chemical effects on the aquatic environment /
Coward, Nathan A. ;
Horton, Joseph W.
||Wisconsin Univ.-Superior.;Environmental Research Lab.-Duluth, MN.
|| U.S. Environmental Protection Agency, Environmental Research Laboratory,
Aquatic biology ;
Water pollution ;
Particle size ;
Flow rate ;
Mine waters ;
Acetic acid ;
Water pollution effects(Animals) ;
Water pollution effects(Plants)
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||85 pages ; 28 cm
The aqueous leaching of heavy metals from soft coal has been examined under a variety of conditions. Variables examined were pH, particle size, rate of flow, time of contact, and oxygen or nitrogen atmosphere. Simple leaching of coal from Western mines with pure water does not remove large amounts of metal. Metal removed was in most cases about 0.1% to 0.5% of the total metal in the coal. Extended, successive leaches (of about one week duration) and leaches in a mildly acid (acetic acid-acetate buffer; pH approximately equals 4.7) tended to remove larger amounts of some metals. Leaching with a strong complexing agent removes relatively larger amounts of metal. When placed in contact with water previously spiked with metal ions, the coal actually reduces the aqueous concentration of many metal ions.
Caption title. "August 1980." "EPA 600/7-80-083a." Microfiche.