| Records |
| Author |
Barton, C.D. |
| Title |
Renovation of a failed constructed wetland treating acid mine drainage |
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Journal Article |
| Year |
1999 |
Publication  |
Environmental Geology |
Abbreviated Journal |
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| Volume |
39 |
Issue |
1 |
Pages |
39-50 |
| Keywords |
mine water treatment |
| Abstract |
Acid mine drainage (AMD) from abandoned underground mines significantly impairs water quality in the Tones Branch watershed in McCreary Co., Kentucky, USA. A 1022-m(2) surface-flow wetland was constructed in 1989 to reduce the I AMD effects, however, the system failed after six months due to insufficient utilization of the treatment area, inadequate alkalinity production and metal overloading. In an attempt to improve treatment efficiencies, a renovation project was designed incorporating two anoxic limestone drains (ALDs) and a series of anaerobic subsurface drains that promote vertical now or mine water through a successive alkalinity producing system (SAPS) of limestone beds overlain by organic compost. Analytical results from the 19-month post-renovation period are very encouraging. Mean iron concentrations have decreased from 787 to 39 mg l(-1), pH increased from 3.38 to 6.46 and acidity has been reduced from 2244 to 199 mg l(-1) (CaCO3 equivalent). Mass removal rates averaged 98% for Al, 95% for Fe, 94% for acidity, 55% for sulfate and 49% for Mn during the study period. The results indicate increased alkalinity production from limestone dissolution and longer residence time have contributed to sufficient buffering and metal retention. The combination of ALDs and SAPS technologies used in the renovation and the sequence in which they were implemented within the wetland system proved to be an adequate and very promising design for the treatment of this and other sources of high metal load AMD. |
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Renovation of a failed constructed wetland treating acid mine drainage; Wos:000084081400004; Times Cited: 5; ISI Web of Science |
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| Call Number |
CBU @ c.wolke @ 17114 |
Serial |
129 |
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| Author |
Mitchell, P. |
| Title |
Silica micro encapsulation: An innovative commercial technology for the treatment of metal and radionuclide contamination in water and soil |
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Journal Article |
| Year |
2000 |
Publication |
Environmental Issues and Management of Waste in Energy and Mineral Production |
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307-314 |
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mine water treatment |
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Klean Earth Environmental Company (KEECO) has developed the Silica Micro Encapsulation (SME) technology to treat heavy metals and radionuclides in water and soil. Unlike conventional neutralization/precipitation methods, SME encapsulates the contaminants in a permanent silica matrix resistant to degradation under even extreme environmental conditions. Encapsulated metals and radionuclides are effectively immobilized, minimising the potential for environmental contamination and impacts on human or ecosystem health. The effectiveness of SME has been proven through independent reviews, laboratory and field trials and commercial contracts, and the technology can be used to control and prevent acid drainage and the transport of soluble metals from mine sites, tailings areas, landfills and industrial sites. Successful demonstrations in the treatment of sediments and in brownfield redevelopment, treatment of metal-finishing wastewaters, and control of hazardous, low-level, and mixed waste at DOE/DOD sites and commercial nuclear power plants have also been undertaken. This paper describes the reactions involved in the SME process, the methods by which SME chemicals are introduced to various media, and recent project applications relevant to the cost effective remediation and prevention of environmental problems arising from energy and mineral production. |
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Silica micro encapsulation: An innovative commercial technology for the treatment of metal and radionuclide contamination in water and soil; Isip:000088357300049; Times Cited: 0; ISI Web of Science |
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CBU @ c.wolke @ 17088 |
Serial |
174 |
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Skousen, J.G. |
| Title |
An Evaluation Of Acid-Mine Drainage Treatment Systems And Costs |
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Journal Article |
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1991 |
Publication |
Environmental Management for the 1990s |
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173-178 |
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mine water treatment |
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An Evaluation Of Acid-Mine Drainage Treatment Systems And Costs; Isip:A1991bs89e00024; Times Cited: 0; ISI Web of Science |
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CBU @ c.wolke @ 9041 |
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148 |
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Jarvis, A.P. |
| Title |
Effective remediation of grossly polluted acidic, and metal-rich, spoil heap drainage using a novel, low-cost, permeable reactive barrier in Northumberland, UK |
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Journal Article |
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2006 |
Publication |
Environmental Pollution |
Abbreviated Journal |
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143 |
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2 |
Pages |
261-268 |
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mine water treatment |
| Abstract |
A permeable reactive barrier (PRB) for remediation of coal spoil heap drainage in Northumberland, UK, is described. The drainage has typical chemical characteristics of pH < 4, [acidity] > 1400 mg/L as CaCO3, [Fe] > 300 mg/L, [Mn] > 165 mg/L, [Al] > 100 mg/L and IS041 > 6500 mg/L. During 2 years of operation the PRB has typically removed 50% of the iron and 40% of the sulphate from this subsurface spoil drainage. Bacterial sulphate reduction appears to be a key process of this remediation. Treatment of the effluent from the PRB results in further attenuation; overall reductions in iron and sulphate concentrations are 95% and 67% respectively, and acidity concentration is reduced by an order of magnitude. The mechanisms of attenuation of these, and other, contaminants in the drainage are discussed. Future research and operational objectives for this novel, low-cost, treatment system are also outlined. (c) 2005 Elsevier Ltd. All rights reserved. |
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Effective remediation of grossly polluted acidic, and metal-rich, spoil heap drainage using a novel, low-cost, permeable reactive barrier in Northumberland, UK; Wos:000238277500010; Times Cited: 0; ISI Web of Science |
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CBU @ c.wolke @ 16928 |
Serial |
109 |
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| Author |
Benner, S.G. |
| Title |
Geochemistry of a permeable reactive barrier for metals and acid mine drainage |
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Journal Article |
| Year |
1999 |
Publication |
Environmental Science & Technology |
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33 |
Issue |
16 |
Pages |
2793-2799 |
| Keywords |
mine water treatment |
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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 |
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CBU @ c.wolke @ 17115 |
Serial |
132 |
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