| Abstract: | Processes affecting neutralization of acidic coal mine drainage were evaluated within ‘anoxic‘ limestone drains (ALDs). Influents had pH???3.5 and dissolved oxygen <2 mg/l. Even though effluents were near neutral (pH 6 and alkalinity acidity), two of the four ALDs were failing due to clogging. Mineral-saturation indices indicated the potential for dissolution of calcite and gypsum, and precipitation of Al3+ and Fe3+ compounds. Cleavage mounts of calcite and gypsum that were suspended within the ALDs and later examined microscopically showed dissolution features despite coatings by numerous bacteria, biofilms, and Fe-Al-Si precipitates. In the drain exhibiting the greatest flow reduction, Al-hydroxysulfates had accumulated on limestone surfaces and calcite etch points, thus causing the decline in transmissivity and dissolution. Therefore, where Al loadings are high and flow rates are low, a pre-treatment step is indicated to promote Al removal before diverting acidic mine water into alkalinity-producing materials. ?? 1998 Elsevier Science Ltd. |
| Genre: | Article |
| ProdID: | 70021937 |
| Citation Author: | Robbins, E. I.; Cravotta, III, C. A.; Savela, C. E.; Nord, Jr. , G. L. |
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| Citation End Page: | 270 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Fuel |
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| Citation Number Of Pages: | 12 |
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| Citation Search Results Text: | Hydrobiogeochemical interactions in ‘anoxic‘ limestone drains for neutralization of acidic mine drainage; 1999; Article; Journal; Fuel; Robbins, E. I.; Cravotta, III, C. A.; Savela, C. E.; Nord, Jr. , G. L. |
| Citation Start Page: | 259 |
| Citation Volume: | 78 |
| Citation Year: | 1999 |
| Type: | citation/reference |
| Text: | Hydrobiogeochemical interactions in ‘anoxic‘ limestone drains for neutralization of acidic mine drainage; 1999; Article; Journal; Fuel; Robbins, E. I.; Cravotta, III, C. A.; Savela, C. E.; Nord, Jr. , G. L. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1999 00:00 -0600 |
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