| Records |
| Author |
Benner, S.G. |
| Title |
Geochemistry of a permeable reactive barrier for metals and acid mine drainage |
Type |
Journal Article |
| Year |
1999 |
Publication |
Environmental Science & Technology |
Abbreviated Journal |
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| Volume |
33 |
Issue |
16 |
Pages  |
2793-2799 |
| Keywords |
mine water treatment |
| Abstract |
A permeable reactive barrier, designed to remove metals and generate alkalinity by promoting sulfate reduction and metal sulfide precipitation, was installed in August 1995 into an aquifer containing effluent from mine tailings. Passage of groundwater through the barrier results in striking improvement in water quality. Dramatic changes in concentrations of SO4 (decrease of 2000-3000 mg/L), Fe (decrease of 270-1300 mg/L), trace metals (e.g., Ni decreases 30 mg/L), and alkalinity (increase of (800-2700 mg/L) are observed. Populations of sulfate reducing bacteria are 10 000 times greater, and bacterial activity, as measured by dehydrogenase activity, is 10 rimes higher within the barrier compared to the up-gradient aquifer. Dissolved sulfide concentrations increase by 0.2-120 mg/ L, and the isotope S-34 is enriched relative to S-32 in the dissolved phase SO42- within the barrier. Water chemistry, coupled with geochemical speciation modeling, indicates the pore water in the barrier becomes supersaturated with respect to amorphous Fe sulfide. Solid phase analysis of the reactive mixture indicates the accumulation of Fe monosulfide precipitates. Shifts in the saturation states of carbonate, sulfate, and sulfide minerals and most of the observed changes in water chemistry in the barrier and down-gradient aquifer can be attributed, either directly or indirectly, to bacterially mediated sulfate reduction. |
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Geochemistry of a permeable reactive barrier for metals and acid mine drainage; Wos:000082074500017; Times Cited: 57; ISI Web of Science |
Approved |
no |
| Call Number |
CBU @ c.wolke @ 17115 |
Serial |
132 |
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| Author |
Zinck, J. |
| Title |
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Type |
Book Whole |
| Year |
2006 |
Publication |
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Abbreviated Journal |
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Issue |
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Pages |
2604-2617 |
| Keywords |
mine water lime treatment high density sludge process co-disposal sludge stability pond disposal backfill leaching mine reclamation |
| Abstract |
Sludge management is an escalating concern as the inventory of sludge continues to grow through perpetual “pump and treat” of acidic waters at mine sites. Current sludge management practices, in general, are ad hoc and frequently do not adress long-term storage, and in some cases, long-term stability. While a variety of sludge disposal practices have been applied, many have not been fully investigated and monitoring data on the performance of these technologies is limited and not readily available. This paper discusses options for treatment sludge management including conventionale disposal technologies and options for reclamation of sludge areas. |
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Proceedings, International Conference of Acid Rock Drainage (ICARD) |
Place of Publication |
St. Louis |
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Icard 2006 |
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Disposal, reprocessing and reuse options for acidic drainage treatment sludge; 2; AMD ISI | Wolkersdorfer; 2 Abb. |
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no |
| Call Number |
CBU @ c.wolke @ 17455 |
Serial |
184 |
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| Author |
Jong, T. |
| Title |
Microbial sulfate reduction under sequentially acidic conditions in an upflow anaerobic packed bed bioreactor |
Type |
Journal Article |
| Year |
2006 |
Publication |
Water Research |
Abbreviated Journal |
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| Volume |
40 |
Issue |
13 |
Pages |
2561-2571 |
| Keywords |
mine water treatment |
| Abstract |
The aim of this study was to operate an upflow anaerobic packed bed reactor (UAPB) containing sulfate reducing bacteria (SRB) under acidic conditions similar to those found in acid mine drainage (AMD). The UAPB was filled with sand and operated under continuous flow at progressively lower pH and was shown to be capable of supporting sulfate reduction at pH values of 6.0, 5.0, 4.5, 4.0 and 3.5 in a synthetic medium containing 53.5 mmol l(-1) lactate. Sulfate reduction rates of 553-1052 mmol m(-3) d(-1) were obtained when the influent solution pH was progressively lowered from pH 6.0 to 4.0, under an optimal flow rate of 2.61 ml min(-1). When the influent pH was further lowered to pH 3.5, sulfate reduction was substantially reduced with only about 1% sulfate removed at a rate of 3.35 mmol m(-3) d(-1) after 20 days of operation. However, viable SRB were recovered from the column, indicating that the SRB population was capable of surviving and metabolizing at low levels even at pH 3.5 conditions for at least 20 days. The changes in conductivity in the SRB column did not always occur with changes in pH and redox potential, suggesting that conductivity measurements may be more sensitive to SRB activity and could be used as an additional tool for monitoring SRB activity. The bioreactor containing SRB was able to reduce sulfate and generate alkalinity even when challenged with influent as low as pH 3.5, indicating that such treatment systems have potential for bioremediating highly acidic, sulfate contaminated waste waters. (c) 2006 Elsevier Ltd. All rights reserved. |
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Microbial sulfate reduction under sequentially acidic conditions in an upflow anaerobic packed bed bioreactor; Wos:000239469400012; Times Cited: 0; ISI Web of Science |
Approved |
no |
| Call Number |
CBU @ c.wolke @ 16929 |
Serial |
108 |
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| Author |
Wolkersdorfer, C. |
| Title |
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Book Whole |
| Year |
2006 |
Publication |
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Abbreviated Journal |
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Issue |
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Pages |
2490-2501 [Cd-Rom] |
| Keywords |
mine water flooded shaft underground mining mine water pollution |
| Abstract |
Acid mine drainage, the drainage of metals, and the prediction of mine water rebound after mine closure are major problems for the mining industry. In the literature, the difficulties in evaluating the hydrodynamics of flooded mines are well described, although only a few tracer tests in flooded mines have been published. Increased knowledge about the hydraulic behaviour of the mine water within a flooded mine might significantly reduce the costs of mine closure and remediation. Relatively cheap and reliable results for decision making can be obtained when tracer tests are properly conducted in a flooded mine prior to planning of remediation strategies or numerical simulations. Applying the results of successful tracer tests allows one to optimise remediation designs and thereby diminish the costs of remediation. The paper summarises the results of several tracer tests and draws general conclusions from such tests. |
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Proceedings, International Conference of Acid Rock Drainage (ICARD) |
Place of Publication |
7 |
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Icard 2006 |
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Acid Mine Drainage Tracer Tests; 2; AMD ISI | Wolkersdorfer; 5 Abb. |
Approved |
no |
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CBU @ c.wolke @ 17446 |
Serial |
203 |
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| Author |
Sasaki, K. |
| Title |
Immobilization of Mn(II) ions by a Mn-oxidizing fungus – Paraconiothyrium sp.-like strain at neutral pHs |
Type |
Journal Article |
| Year |
2006 |
Publication |
Mater. Trans. |
Abbreviated Journal |
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| Volume |
47 |
Issue |
10 |
Pages |
2457-2461 |
| Keywords |
mine water treatment |
| Abstract |
A Mn-oxidizing fungus was isolated from a constructed wetland of Hokkaido (Japan), which is receiving the Mn-impacted drainage, and genetically and morphologically identified as Paraconiothyrium sp.-like strain. The optimum pHs were 6.45-6.64, where is more acidic than those of previously reported Mn-oxidizing fungi. Too much nutrient inhibited fungal Mn-oxidation, and too little nutrient also delayed Mn oxidation even at optimum pH. In order to achieve the oxidation of high concentrations of Mn like mine drainage containing several hundreds g-m(-3) of Mn, it is important to find the best mix ratio among the initial Mn concentrations, inocolumn size and nutrient concentration. The strain has still Mn-tolerance with more than 380 g-m(-3) of Mn, but high Mn(II) oxidation was limited by pH control and supplied nutrient amounts. The biogenic Mn deposit was poorly crystallized birnessite. The strain is an unique Mn-oxidizing fungus having a high Mn tolerance and weakly acidic tolerance, since there has been no record about the property of the strain. There is a potentiality to apply the strain to the environmental bioremediation. |
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Immobilization of Mn(II) ions by a Mn-oxidizing fungus – Paraconiothyrium sp.-like strain at neutral pHs; Wos:000242429300002; Times Cited: 0; ISI Web of Science |
Approved |
no |
| Call Number |
CBU @ c.wolke @ 16940 |
Serial |
103 |
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