| Records |
Author  |
Harrington, J.M. |
| Title |
In situ treatment of metals in mine workings and materials |
Type |
Journal Article |
| Year |
2002 |
Publication |
Tailings and Mine Waste '02 |
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Pages |
251-261 |
| Keywords |
mine water treatment |
| Abstract |
Contact of oxygen contained in air and water with mining materials can increase the solubility of metals. In heaps leached by cyanide, metals can also be made soluble through complexation with cyanide. During closure, water in heaps, and water collected in mine workings and pit lakes may require treatment to remove these metals. In situ microbiological treatment to create reductive conditions and to precipitate metals as sulfides or elemental metal has been applied at several sites with good success. Treatment by adding organic carbon to stimulate in situ microbial reduction has been successful in removing arsenic, cadmium, chromium, copper, iron, lead, manganese, mercury, nickel, selenium, silver, tin, uranium, and zinc to a solid phase. Closure practices can affect the success of in situ treatment at mining sites, and affect the stability of treated materials. This paper defines factors that determine the cost and permanence of in situ treatment. |
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In situ treatment of metals in mine workings and materials; Isip:000175560600034; Times Cited: 0; ISI Web of Science |
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CBU @ c.wolke @ 17037 |
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161 |
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| Author |
Gusek, J.J. |
| Title |
Design challenges for large scale sulfate reducing bioreactors |
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Journal Article |
| Year |
2005 |
Publication |
Contaminated Soils, Sediments and Water: Science in the Real World, Vol 9 |
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9 |
Issue |
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Pages |
33-44 |
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mine water treatment |
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The first large-scale (1,200 gpm capacity), sulfate-reducing; bioreactor (SRBR) was constructed in 1996 to treat water from an underground lead mine in Missouri. Other large-scale SRBR systems have been built elsewhere since then. This technology holds much promise for economically treating heavy metals and has progressed steadily from the laboratory to industrial applications. Scale-up challenges include: designing for seasonal temperature variations, minimizing short circuits, changes in metal loading rate s, storm water impacts, and resistance to vandalism. However, the biggest challenge may be designing for the progressive biological degradation of the organic substrate and its effects on the hydraulics of the SRBR cells. |
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Design challenges for large scale sulfate reducing bioreactors; Isip:000225303300004; Times Cited: 0; ISI Web of Science |
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CBU @ c.wolke @ 16959 |
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156 |
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| Author |
Guay, R. |
| Title |
Effect of flooding of oxidized mine tailings on T-ferrooxidans and T-thiooxidans survival and acid mine drainage production: a 4 year restoration-environmental follow-up |
Type |
Journal Article |
| Year |
1999 |
Publication |
Biohydrometallurgy and the Environment toward the Mining of the 21st Century, Pt B 1999 |
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9 |
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635-643 |
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mine water treatment |
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A pilot-scale study on the effect of flooding unoxidized and oxidized Cu/Zn tailings demonstrated the technical feasability of this technology to remediate a mining site where over 3 million tons of tailings were impounded. Full-scale flooding of the tailing pond with free running water was undertaken after the construction of an impervious dam; approximately 2 million m(3) of surface water at pH 7,4 completely covered the tailings after 16 months. The minimal water column over the tailings was established at 1,20 m and reached 4,5 m, depending on the site topography. Water and tailings samples were collected from 9 different locations from the surface of the man-made lake using a specially designed borer and were analyzed for pH, conductivity, iron- and sulfur-oxidizing bacteria activity and numbers as well as the sulfate reducing bacteria (SRB) population. We showed that over a four year period of flooding, the overall population of iron-oxidizers decreased considerably; their numbers drastically fell from 1 x 10(6) to 1 x 10(2) active cells per g of oxidized tailings while the SRBs increased from 10(1) to 10(5)/g. The pH of the influent, the reservoir and the effluent water remained fairly constant between 6,9 up to 7,4 over the entire period. During this time, interstitial water pH increased from 2,9 to 4,3 in flooded tailings where lime could not be incorporated in the first 20 cm of tailings; elsewhere, the pH of the tailings suspensions remained fairly constant around neutral values (pH 7,0). Dissolved oxygen was measured at fixed intervals and remained also constant between 6 and 7.5 mg/L while water temperatures fluctuated below freezing point to +20C respectively in winter and summer season. |
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Effect of flooding of oxidized mine tailings on T-ferrooxidans and T-thiooxidans survival and acid mine drainage production: a 4 year restoration-environmental follow-up; Isip:000086245100066; Times Cited: 0; ISI Web of Science |
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CBU @ c.wolke @ 17121 |
Serial |
175 |
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| Author |
Groudev, S.N.; Georgiev, P.S.; Spasova, I.I.; Nicolova, M.N. |
| Title |
In situ treatment of mine waters by means of a permeable barrier |
Type |
Journal Article |
| Year |
2000 |
Publication |
Groundwater 2000 |
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Pages |
417-418 |
| Keywords |
mine water treatment |
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Acid ground waters contaminated with radioactive elements (U, Ra, Th), toxic heavy metals (Cu, Zn, Cd, Mn, Fe), arsenic and sulphates were treated by means of a permeable barrier. The barrier was filled with a mixture of biodegradable solid organic substrates (spent mushroom compost, sawdust and cow manure) and was inhabited by a mixed microbial community consisting of sulphate-reducing bacteria and other metabolically interdependent microorganisms. An efficient removal of the pollutants was achieved by this barrier during the different climatic seasons, even at ambient temperatures close to degrees C. The microbial dissimilatory sulphate reduction and the sorption of pollutants by the organic matter in the barrier were the main processes involved in this removal. |
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In situ treatment of mine waters by means of a permeable barrier; Isip:000088384300185; Times Cited: 0; ISI Web of Science |
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no |
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CBU @ c.wolke @ 8407 |
Serial |
173 |
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| Author |
Groudev, S.N. |
| Title |
Treatment of acid mine drainage by a natural wetland |
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Journal Article |
| Year |
2002 |
Publication |
Wetlands and Remediation Ii |
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133-139 |
| Keywords |
mine water treatment |
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Acid drainage waters generated in the copper ore deposit Elshitza. Central Bulgaria, were treated by a natural wetland located in the deposit. The waters had a pH in the range of about 2.5 – 3.5 and contained copper, cadmium, arsenic, iron, manganese and sulphates as main pollutants. The watercourse through the wetland covered a distance of about 100 in and the water flow rate varied in the range of about 0.5 – 2.0 1/s. The wetland was characterized by an abundant water and emergent vegetation and a diverse microflora. Phragmites communis was the prevalent plant species in the wetland but species of the genera Scirpus, Typha, Juncus, Carex and Poa as well as different algae were also well present. It was found that an efficient removal of the pollutants was achieved and their residual concentrations in the wetland effluents were decreased below the relevant permissible levels for water intended for use in the agriculture and/or industry. The removal was clue to different processes but the microbial dissimilatory sulphate reduction and the sorption of pollutants by the organic matter and clay minerals present in the wetland played the main role. Negative effects of the pollutants on the growth and activity of the indigenous plant and microbial communities were not observed. |
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Treatment of acid mine drainage by a natural wetland; Isip:000175585500017; Times Cited: 0; ISI Web of Science |
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no |
| Call Number |
CBU @ c.wolke @ 17039 |
Serial |
159 |
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