| Records |
| 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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113-121 |
| Keywords |
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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CBU @ c.wolke @ 17600 |
Serial |
388 |
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| Author |
Ziemkiewicz, P.F.; Skousen, J.G.; Lovett, R.; Skousen, J.G.; Ziemkiewicz, P.F. |
| Title |
Open limestone channels for treating acid mine drainage; a new look at an old idea |
Type |
Book Chapter |
| Year |
1996 |
Publication |
Acid mine drainage control and treatment |
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acid mine drainage; acidic composition; acidification; Appalachians; carbonate rocks; chemical reactions; concentration; constructed wetlands; ground water; limestone; North America; Pennsylvania; pollution; sedimentary rocks; surface water; United States; water quality; water treatment; West Virginia; western Pennsylvania; wetlands 22, Environmental geology |
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West Virginia University and the National Mine Land Reclamation Center |
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Morgantown |
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Open limestone channels for treating acid mine drainage; a new look at an old idea; GeoRef; English; 2004-051154; Edition: 2 References: 5; illus. incl. 5 tables |
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CBU @ c.wolke @ 6364 |
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188 |
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Ziemkiewicz, P.F.; Skousen, J.G.; Brant, D.L.; Sterner, P.L.; Lovett, R.J.; Skousen, J.G.; Ziemkiewicz, P.F. |
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Acid mine drainage treatment with armored limestone in open limestone channels |
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Book Chapter |
| Year |
1996 |
Publication |
Acid mine drainage control and treatment |
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Pages |
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abandoned mines; acid mine drainage; acidification; carbonate rocks; case studies; chemical reactions; coal mines; controls; decontamination; effluents; environmental management; experimental studies; ground water; heavy metals; hydrology; limestone; mines; Pennsylvania; pollution; reclamation; sedimentary rocks; soils; surface water; United States; water treatment; watersheds; West Virginia 22, Environmental geology |
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West Virginia University and the National Mine Land Reclamation Center |
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Morgantown |
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Acid mine drainage treatment with armored limestone in open limestone channels; GeoRef; English; 2004-051155; Edition: 2 References: 14; illus. incl. 6 tables |
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CBU @ c.wolke @ 6365 |
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189 |
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Faulkner, B.B.; Skousen, J.G.; Skousen, J.G.; Ziemkiewicz, P.F. |
| Title |
Treatment of acid mine drainage by passive treatment systems |
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Book Chapter |
| Year |
1996 |
Publication |
Acid mine drainage control and treatment |
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Issue |
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Pages |
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acid mine drainage; acidification; alkalinity; carbonate rocks; chemical reactions; constructed wetlands; controls; depositional environment; ground water; heavy metals; limestone; microorganisms; pollution; sedimentary rocks; substrates; surface water; techniques; United States; water pollution; water treatment; West Virginia; wetlands 22, Environmental geology |
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West Virginia University and the National Mine Land Reclamation Center |
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Morgantown |
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Treatment of acid mine drainage by passive treatment systems; GeoRef; English; 2004-051153; Edition: 2 References: 13; illus. incl. 4 tables |
Approved |
no |
| Call Number |
CBU @ c.wolke @ 6363 |
Serial |
384 |
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Cravotta, C.A., III; Trahan, M.K. |
| Title |
Limestone drains to increase pH and remove dissolved metals from acidic mine drainage |
Type |
Journal Article |
| Year |
1999 |
Publication |
Appl. Geochem. |
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14 |
Issue |
5 |
Pages |
581-606 |
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manganese oxide redox processes sulfate waters iron-oxides adsorption ions oxidation surfaces environments aluminum |
| Abstract |
Despite encrustation by Fe and Al hydroxides, limestone can be effective for remediation of acidic mine drainage (AMD). Samples of water and limestone (CaCO3) were collected periodically for 1 a at 3 identical limestone-filled drains in Pennsylvania to evaluate the attenuation of dissolved metals and the effects of pH and Fe- and Al-hydrolysis products on the rate of CaCO3 dissolution. The influent was acidic and relatively dilute (pH < 4; acidity < 90 mg) but contained 1-4 mg . L-1 of O-2, Fe3+, Al3+ and Mn2+. The total retention time in the oxic limestone drains (OLDs) ranged from 1.0 to 3.1 hr. Effluent remained oxic (O-2 > 1 mg . L-1) but was near neutral (pH = 6.2-7.0); Fe and Al decreased to less than 5% of influent concentrations. As pH increased near the inflow, hydrous Fe and Al oxides precipitated in the OLDs, The hydrous oxides, nominally Fe(OH)(3) and Al(OH)(3), were visible as loosely bound, orange-yellow coatings on limestone near the inflow. As time elapsed, Fe(OH)(3) and Al(OH)(3) particles were transported downflow. The accumulation of hydrous oxides and elevated pH (> 5) in the downflow part of the OLDs promoted sorption and coprecipitation of dissolved Mn, Cu, Co, Ni and Zn as indicated by decreased concentrations of the metals in effluent and their enrichment relative to Fe in hydrous-oxide particles and coatings on limestone. Despite thick (similar to 1 mm) hydrous-oxide coatings on limestone near the inflow, CaCO3 dissolution was more rapid near the inflow than at downflow points within and the OLD where the limestone was not coated. The high rates of CaCO3 dissolution and Fe(OH3) precipitation were associated with the relatively low pH and high Fe3+ concentration near the inflow. The rate of CaCO3 dissolution decreased with increased pH and concentrations of Ca2+ and HCO3- and decreased Pco(2). Because overall efficiency is increased by combining neutralization and hydrolysis reactions, an OLD followed by a settling pond requires less land area than needed for a two-stagetreatment system consisting of an anoxic limestone drain and oxidation-settling pond or wetland. To facilitate removal of hydrous-oxide sludge, a perforated-pipe subdrain can be installed within an OLD. (C) 1999 Elsevier Science Ltd. |
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0883-2927 |
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Jul; Limestone drains to increase pH and remove dissolved metals from acidic mine drainage; Isi:000080043300004; file:///C:/Dokumente%20und%20Einstellungen/Stefan/Eigene%20Dateien/Artikel/10102.pdf; AMD ISI | Wolkersdorfer |
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CBU @ c.wolke @ 17470 |
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22 |
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