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Author |
Smith, I.J.H. |
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Title |
AMD treatment, it works but are we using the right equipment? |
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Journal Article |
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Year |
2000 |
Publication |
Tailings and mine waste ' |
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419-427 |
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Groundwater problems and environmental effects geomechanics abstracts: excavations (77 10 10) acid mine drainage conference proceedings methodology mine drainage remediation waste management |
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Abstract |
For the past 40 years various approaches have been developed to treat acid waters coming from abandoned as well as operating mining operations. System designs have evolved to meet increasingly stringent discharge permit limits for treated water, as well as to provide solid disposal within economic constraints. A treatment system for remediation of acid mine drainage (AMD) or acid groundwater (AG) requires two main steps: 1. The addition of chemicals to precipitate dissolved metals contained in the waters, and if necessary, to coagulate the precipitated solids ahead of physical separation. 2. Physical separation of the precipitated solids from the water so the water can be lawfully discharged from the site. Choosing the appropriate technology and equipment results in the most efficient plant design, the lowest capital outlay, and minimum operating cost. The goal of these plants is to discharge liquids and solids able to meet standards. The separation of solids from liquids can be achieved through various means, including gravity settling, flotation, mechanical dewatering, filtration and evaporation. As important as the liquid solids separation unit operations are, they are driven by the chemistry of the water to be treated. The content of the dissolved solids will influence the quality and quantity of the solids produced during precipitation. Thus the two aspects must be integrated, with chemistry first, then mechanical engineering. This presentation will provide an overview of a number of liquid solids separation tools currently being used to treat AMD-AG at several sites in the USA. It will also discuss how their operations are impacted by the chemistry of their particular acid water feeds. The tools used include clarifier-thickeners, solids contact clarifiers, dissolved air flotation, polishing filters, membrane filters, and mechanical dewatering devices (belt and filter presses, vacuum filters, and driers). |
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J.H. Smith III, SEPCO Incorporated, Fort Collins, CO, United States |
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Book; Conference-Paper; AMD treatment, it works but are we using the right equipment?; 2263351; Using Smart Source Parsing 00-Proceedings-of-the-7th-international-conference-Fort-Collins-January- 2000 Netherlands; Geobase |
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CBU @ c.wolke @ 17541 |
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237 |
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Author |
Sato, D.; Tazaki, K. |
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Title |
Calcification treatment of mine drainage and depositional formula of heavy metals |
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Journal Article |
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Year |
2000 |
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Chikyu Kagaku = Earth Science |
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54 |
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5 |
Pages |
328-336 |
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acid mine drainage Asia calcification deposition ettringite Far East heavy metals Ishikawa Japan Japan lime Ogoya Mine pollution sulfates waste water water treatment 22, Environmental geology |
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Depositional formula of heavy metals after disposal of the mine drainage from the Ogoya Mine in Ishikawa Prefecture, Japan, was mineralogically investigated. Strong acidic wastewater (pH 3.5) from pithead of the mine contains high concentration of heavy metals. In this mine, neutralizing coagulation treatment is going on by slaked lime (calcium hydroxides: Ca(OH) (sub 2) ). Core samples were collected at disposal pond to which the treated wastewater flows. The core samples were divided into 44 layers based on the color variation. The mineralogical and chemical compositions of each layer were analyzed by an X-ray powder diffractometer (XRD), an energy dispersive X-ray fluorescence analyzer (ED-XRF) and a NCS elemental analyzer. The upper parts are rich in brown colored layers, whereas discolored are the deeper parts. The color variation is relevant to Fe concentration. Brown colored core sections are composed of abundant hydrous ferric oxides with heavy metals, such as Cu, Zn, and Cd. On the other hand, S concentration gradually increases with depth. XRD data indicated that calcite decreases with increasing depth, and ettringite is produced at the deeper parts. Cd concentration shows similar vertical profile to those of calcite and ettringite. The results revealed that hydrous ferric oxides, calcite and ettringite are formed on deposition, whereby incorporating the heavy metals. |
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0366-6611 |
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Calcification treatment of mine drainage and depositional formula of heavy metals; 2001-032610; References: 19; illus. incl. 1 table, sketch map Japan (JPN); GeoRef; Japanese |
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CBU @ c.wolke @ 16543 |
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252 |
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Komnitsas, K.; Xenidis, A.; Tabouris, S. |
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Title |
Composite cover for the prevention of acid mine drainage |
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Journal Article |
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2000 |
Publication |
Mining Environmental Management |
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8 |
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6 |
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14-17 |
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acid mine drainage; case studies; dams; Europe; field studies; Greece; Laurion Greece; pollution; preventive measures; remediation; Southern Europe; Sterea Ellas; tailings; tailings dams 22, Environmental geology |
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0969-4218 |
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Composite cover for the prevention of acid mine drainage; 2001-038333; References: 4; illus. incl. 4 tables United Kingdom (GBR); GeoRef; English |
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CBU @ c.wolke @ 5800 |
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327 |
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Author |
Jarvis, A.P. |
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Title |
Design, construction and performance of passive systems for the treatment of mine and spoil heap drainage |
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Book Whole |
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2000 |
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Sewage Geochemistry County Durham Compost wetland Reactor Water pollution & oil pollution |
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Ph.D. thesis |
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University of Newcastle upon Tyne, |
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Design, construction and performance of passive systems for the treatment of mine and spoil heap drainage; Opac |
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CBU @ c.wolke @ 7115 |
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340 |
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Author |
Frisch, K.-R. |
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Book Whole |
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2000 |
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258 pp |
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Grubenwasser Gewässerversauerung Versatz <Bergbau> Neutralisation <Chemie> Umweltbilanz |
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Clausthal-Zellerfeld: Papierflieger |
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Clausthal-Zellerfeld |
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Die Verringerung der Sauerwasserbildung im untertägigen Bergbau durch Versatz |
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3-89720-397-9 |
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Die Verringerung der Sauerwasserbildung im untertägigen Bergbau durch Versatz; Clausthal-Zellerfeld: Papierflieger; Clausthal, Techn. Univ., Diss.; Opac |
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CBU @ c.wolke @ 6939 |
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373 |
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