| Records |
| Author |
Bliss, L.N.; Sellstone, C.M.; Nicholson, A.D.; Kempton, J.H. |
| Title |
Buffering of acid rock drainage by silicate minerals |
Type |
Journal Article |
| Year |
1997 |
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| Keywords |
acid mine drainage; buffers; chemical reactions; decontamination; environmental analysis; geochemistry; pH; pollution; remediation; silicates; sulfate ion; USGS 22 Environmental geology; 02A General geochemistry |
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Open-File Report - U. S. Geological Survey, Report: OF 97-0496 |
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4th International symposium on Environmental geochemistry; proceedings |
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1998-068723; 4th International symposium on Environmental geochemistry, Vail, CO, United States, Oct. 5-10, 1997 U. S. Geol. Surv., Denver, CO, United States; GeoRef; English |
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no |
| Call Number |
CBU @ c.wolke @ 6286 |
Serial |
446 |
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| Author |
Bannister, A.F. |
| Title |
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Book Whole |
| Year |
1997 |
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Pages |
105-122 |
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wetland coal mining Doworth |
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Chartered Institution of Water and Environmental Management |
Place of Publication |
London |
Editor |
Younger Paul, L. |
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Series Title |
Minewater Treatment Using Wetlands |
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Lagoon and reed-bed treatment of colliery shale tip water at Doworth, South Yorkshire; 1; AMD ISI | Wolkersdorfer; Fg |
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no |
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CBU @ c.wolke @ 9517 |
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466 |
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| Author |
Eriksson, P.K.; Lien, L.A.; Green, D.H.; Kyburz, M. |
| Title |
Nanofiltration für die Aufkonzentrierung von Kupfersulfat von Auslaugewässern und die Rückgewinnung von Schwefelsäure |
Type |
Conference Article |
| Year |
1997 |
Publication |
6. Aachener Membran Kolloquium, Preprints, Aachen, DE, 3. 5. Mar, 1997 |
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Pages |
113-121 |
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Abwasserbehandlung Abraum Auslaugen=Mineralogie Ausfällung Membranfilter Adsorption Biomasse Konzentration Kupfer Porenweite Querströmung Schwermetalle Soda Investitionskosten Betriebskosten Kolonne=Apparat Pilotanlage Schwefelsäure Wiederverwertung Metallsalz Nanofiltration Kupfermine Biomassekolonne Entkrustungsmittel |
| Abstract |
In einem US-amerikanischen Minenbetrieb fallen bei der Auslaugung von Abraum zur Gewinnung von Restkupfer Abwässer an, die höhere Konzentrationen aufweisen als für Abwässer erlaubt ist. Eine bislang angewandte chemische Fällung erforderte erhebliche Kosten. Mit der Nanofiltration (NF), verbunden mit einer Biomasse-Adsorptionsstufe, erhält man ein weniger problematisches Abwasser, das direkt eingeleitet werden darf. Dieses Wasser kann im Betrieb sogar als Frischwasser dort eingesetzt werden, wo höhere Anteile an Silikaten toleriert werden können. Ein weiterer Vorteil der NF-Technik ist die Aufkonzentration der Metallsalze und die Rückgewinnung von Schwefelsäure. Kupfer liegt z.B. nach der ersten Stufe in solcher Konzentration vor, daß die Extraktionskapazität der existierenden Anlage stark erhöht wird. Die Nanofiltration ist ein Membranprozeß, bei dem Membranen mit Porengrößen von ca. 1 nm eingesetzt werden. Die Porengröße ist kleiner als bei Ultrafiltrationsverfahren und nur wenig größer als bei Umkehrosmosemembranen. Gearbeitet wird mit dem Prinzip der Queranströmung (Crossflow). Zur Entfernung der relativ geringen Anteile an Schwermetallen wird zusätzlich eine Biomasse-Kolonne eingesetzt. Beschrieben wird der Aufbau bzw. das Fließschema einer Pilotanlage. Untersuchungen mit dieser Anlage bestätigten die Wirksamkeit der NF- Abwasserbehandlung mit anschließender Adsorption an Biomasse. Die zugeführten Chemikalien bestehen lediglich aus relativ harmlosen Stoffen wie Entkrustungsmittel und Soda. Das Entkrustungsmittel wird benötigt, um Ablagerungen von Anorganika auf den Membranen zu verhindern. Das Soda neutralisiert das aufbereitete Wasser. Beide Chemikalien verhalten sich im Prozeß ansonsten neutral. Hauptsächliche Ausgaben entstehen für Kapitalkosten. Betriebskosten entstehen für den Membranersatz und die Energie. Die Versuchsresultate und Erkenntnisse aus den Versuchen konnten weitgehend für die Auslegung einer NF-Anlage in einer Kupfermine in Mexiko übernommen werden, die im Frühjahr 1997 in Betrieb genommen werden soll. |
| Address |
Escondido, US; Harrison Western Environ Services, Lakewood, US; Osmonics- Desal, Aarau, CH |
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Nanofiltration für die Aufkonzentrierung von Kupfersulfat von Auslaugewässern und die Rückgewinnung von Schwefelsäure; BERG, Copyright FIZ Technik e.V.; DE Deutsch; Csn=00011; M9705 0920 570; 13759, BERG , 11.06.97; Words: 592; 9 Seiten, 4 Bilder 3PAB *Aufbereitung anorganischer, mineralischer Rohstoffe* 3PH *Trennen fest/flüssig/gasförm. Stoffe, dispers. Stoffsysteme* 3UXX *Belastung von Wasser, Wasserreinhaltung, Abwasser* 3KEM *Nichteisenmetalle/ legierungen/ gußwerkstoffe* |
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no |
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CBU @ c.wolke @ 17600 |
Serial |
388 |
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| Author |
Barton, C.D.; Karathanasis, A.D. |
| Title |
Aerobic and anaerobic metal attenuation processes in a constructed wetland treating acid mine drainage |
Type |
Book Chapter |
| Year |
1997 |
Publication |
AAPG Eastern Section and the Society for Organic Petrology joint meeting; abstracts |
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Issue |
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Pages |
1545 |
| Keywords |
acid mine drainage aerobic environment air-water interface anaerobic environment attenuation buffers constructed wetlands controls diffusion iron manganese metals mineral composition pollution precipitation processes SEM data solubility solution sulfate ion sulfur wetlands X-ray diffraction data 22, Environmental geology |
| Abstract |
The use of constructed wetlands for acid mine drainage amelioration has become a popular alternative to conventional treatment methods, however, the metal attenuation processes of these systems are poorly understood. Precipitates from biotic and abiotic zones of a staged constructed wetland treating high metal load (approx. equal to 1000 mg L (super -1) ) and low pH (approx. 3.0) acid mine drainage were characterized by chemical dissolution, x-ray diffraction, thermal analysis and scanning electron microscopy. Characterization of abiotic/aerobic zones within the treatment system suggest the presence of crystalline iron oxides and hydroxides such as hematite, lepidocrocite, goethite, and jarosite. At the air/water interface of initial abiotic treatment zones, SO (sub 4) /Fe ratios were low enough (<2.0) for the formation of jarosite and goethite, but as the ratio increased due to treatment and subsequent reductions in iron concentration, jarosite was transformed to other Fe-oxyhydroxysulfates and goethite formation was inhibited. In addition, elevated pH conditions occurring in the later stages of treatment promoted the formation of amorphous iron oxyhydroxides. Biotic wetland cell substrate characterizations suggest the presence of amorphous iron minerals such as ferrihydrite and Fe(OH) (sub 3) . Apparently, high Fe (super 3+) activity, low Eh and low oxygen diffusion rates in the anaerobic subsurface environment inhibit the kinetics of crystalline iron precipitation. Some goethite, lepidocrocite and hematite, however, were observed near the surface in biotic areas and are most likely attributable to increased oxygen levels from surface aeration and/or oxygen transport by plant roots. Alkalinity generation from limestone dissolution within the substrate and bacterially mediated sulfate reduction also has a significant role on the mineral retention process. The formation of gypsum, rhodochrocite and siderite are by-products of alkalinity generating reactions in this system and may have an impact on S, Mn, and Fe solubility controls. Moreover, the buffering of acidity through excess alkalinity appears to facilitate the precipitation and retention of metals within the system. |
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AAPG Bulletin |
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81 |
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Aerobic and anaerobic metal attenuation processes in a constructed wetland treating acid mine drainage; GeoRef; English; 1997-067790; AAPG Eastern Section and the Society for Organic Petrology joint meeting, Lexington, KY, United States, Sep. 27-30, 1997 |
Approved |
no |
| Call Number |
CBU @ c.wolke @ 16630 |
Serial |
70 |
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| Author |
Cox, M.R.; Peterson, G.L. |
| Title |
The effectiveness of in-situ limestone treatment of acid mine drainage Association of Engineering Geologists program with abstracts, 40th annual meeting; Converging at Cascadia |
Type |
Book Chapter |
| Year |
1997 |
Publication |
Annual Meeting – Association of Engineering Geologists, vol.40 |
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Issue |
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Pages |
93 |
| Keywords |
acid mine drainage; buffers; carbonate rocks; Carboniferous; clastic sediments; gravel; in situ; limestone; Mississippian; Missouri; Paleozoic; pollution; sedimentary rocks; sediments; southwestern Missouri; spoils; tailings ponds; United States; water pollution 22, Environmental geology |
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The effectiveness of in-situ limestone treatment of acid mine drainage Association of Engineering Geologists program with abstracts, 40th annual meeting; Converging at Cascadia; GeoRef; English; 2005-076824; Association of Engineering Geologists 40th annual meeting, Portland, OR, United States, Sept. 30-Oct. 4, 1997 |
Approved |
no |
| Call Number |
CBU @ c.wolke @ 6318 |
Serial |
412 |
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