116.
Geochemical modeling was used to investigate downstream changes in coal mine drainage at Silver Creek Metro-park, Summit
County, Ohio. A simple mixing model identified the components that are undergoing conservative transport (Cl
–, PO
4
3–, Ca
2+, K
+, Mg
2+ and Na
+) and those undergoing reactive transport (DO, HCO
3
–, SO
4
2–, Fe
2+, Mn
2+ and Si). Fe
2+ is removed by precipitation of amorphous iron-hydroxide. Mn
2+ are removed along with Fe
2+ by adsorption onto surfaces of iron-hydroxides. DO increases downstream due to absorption from the atmosphere. The HCO
3
– concentration increases downstream as a result of oxidation of organic material. The rate of Fe
2+ removal from the mine drainage was estimated from the linear relationship between Fe
+2 concentration and downstream distance to be 0.126 mg/s. Results of this study can be used to improve the design of aerobic
wetlands used to treat acid mine drainage.
Received: 4 June 1996 · Accepted: 17 September 1996
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