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Curi, A.C.; Granda, W.J.V.; Lima, H.M.; Sousa, W.T. |
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Title |
Zeolites and their application in the decontamination of mine waste water |
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Journal Article |
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2006 |
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Informacion Tecnologica |
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17 |
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6 |
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111-118 |
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adsorption decontamination effluents industrial waste ion exchange metallurgical industries metallurgy mining mining industry porosity wastewater treatment zeolites zeolites decontamination mine waste water genesis porosity adsorption ionic exchange mineral metallurgical effluents mercury pollution artisan mining activities heavy metals removal metal mining effluents mercury vapors ovens fire amalgams Manufacturing and Production |
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Abstract |
This paper describes the genesis, structure and classification of natural zeolites, including their most relevant properties such as porosity, adsorption and ionic exchange. The use of natural zeolites in the treatment of effluents containing heavy metals is reviewed based on current literature. These uses are focused on mineral-metallurgical effluents and mercury pollution related to artisan mining activities. The study shows that natural zeolites are efficient in removal of heavy metals in metal mining effluents, can be produced and improved at a low cost, and can also be used to adsorb mercury vapors from ovens used to fire amalgams. |
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0716-8756 |
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Zeolites and their application in the decontamination of mine waste water; 9532002; Journal Paper; SilverPlatter; Ovid Technologies |
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CBU @ c.wolke @ 16784 |
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409 |
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Potgieter-Vermaak, S.S.; Potgieter, J.H.; Monama, P.; Van Grieken, R. |
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Comparison of limestone, dolomite and fly ash as pre-treatment agents for acid mine drainage |
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Journal Article |
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2006 |
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Minerals Engineering |
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19 |
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5 |
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454-462 |
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Acid rock drainage Mining Tailings Environmental |
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The physical, chemical and biological nature of Vaal Dam water, the main source of water in Gauteng, South Africa, is often affected by underground water pollution (acid mine water) and industrial effluents. The ecological significance and detrimental effects necessitate investigations into treating the water prior to discharge into public streams. Although several acid mine water treatment techniques and methods exist, they all have certain disadvantages. Lime treatment is the most common approach. In this investigation, limestone, dolomite and fly ash were selected as pre-treatment agents based on their low cost. Simulated acid mine water containing these agents was tested using a Jar Test apparatus. Samples were analyzed before and after treatment for pH, ferrous, ferric, calcium, magnesium and sulphate ions. The study demonstrated that the quality of the water improved with an increase in the amount and surface area of the raw material dosed and an increase in contact time. It was also influenced by the chemical composition of the acid mine water and aeration. Chemical cost savings of 38% are achieved when lime is replaced with limestone, and cost savings of 23% and 48% can be accomplished when limestone is substituted with dolomite and fly ash respectively. This could result in significant savings to the gold and coal mining industries, and could lead to a mutual benefit/gain between industrialists/polluters and the public. |
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0892-6875 |
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Apr.; Comparison of limestone, dolomite and fly ash as pre-treatment agents for acid mine drainage; Science Direct |
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CBU @ c.wolke @ 17461 |
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42 |
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Fisher, T.S.R.; Lawrence, G.A. |
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Treatment of acid rock drainage in a meromictic mine pit lake |
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Journal Article |
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2006 |
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Journal of environmental engineering |
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132 |
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4 |
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515-526 |
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Pollution and waste management non radioactive Groundwater problems and environmental effects geological abstracts: environmental geology (72 14 2) geomechanics abstracts: excavations (77 10 10) meromictic lake acid mine drainage mine waste copper water pollution Bacteria microorganisms Canada Vancouver Island British Columbia North America |
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The Island Copper Mine pit near Port Hardy, Vancouver Island, B.C., Canada, was flooded in 1996 with seawater and capped with fresh water to form a meromictic (permanently stratified) pit lake of maximum depth 350 m and surface area 1.72 km2. The pit lake is being developed as a treatment system for acid rock drainage. The physical structure and water quality has developed into three distinct layers: a brackish and well-mixed upper layer; a plume stirred intermediate layer; and a thermally convecting lower layer. Concentrations of dissolved metals have been maintained well below permit limits by fertilization of the surface waters. The initial mine closure plan proposed removal of heavy metals by metal-sulfide precipitation via anaerobic sulfate-reducing bacteria, once anoxic conditions were established in the intermediate and lower layers. Anoxia has been achieved in the lower layer, but oxygen consumption rates have been less than initially predicted, and anoxia has yet to be achieved in the intermediate layer. If anoxia can be permanently established in the intermediate layer then biogeochemical removal rates may be high enough that fertilization may no longer be necessary. < copyright > 2006 ASCE. |
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Prof. G.A. Lawrence, Univ. of British Columbia, Vancouver, BC V6T 1Z4, Canada lawrence@civil.ubc.ca |
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0733-9372 |
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Apr.; Treatment of acid rock drainage in a meromictic mine pit lake; 2873922; United-States 38; Geobase |
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CBU @ c.wolke @ 17494 |
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72 |
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Olaniran, A.O. |
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Title |
Biostimulation and bioaugmentation enhances aerobic biodegradation of dichloroethenes |
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Journal Article |
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2006 |
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Chemosphere |
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63 |
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4 |
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600-608 |
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mine water treatment |
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The accumulation of dichloroethenes (DCEs) as dominant products of microbial reductive dechlorination activity in soil and water represent a significant obstacle to the application of bioremediation as a remedial option for chloroethenes in many contaminated systems. In this study, the effects of biostimulation and/or bioaugmentation on the biodegradation of cis- and trans-DCE in soil and water samples collected from contaminated sites in South Africa were evaluated in order to deter-mine the possible bioremediation option for these compounds in the contaminated sites. Results from this study indicate that cis- and trans-DCE were readily degraded to varying degrees by natural microbial populations in all the soil and water samples tested, with up to 44% of cis-DCE and 41% of trans-DCE degraded in the untreated soil and water samples in two weeks. The degradation rate constants ranged significantly (P < 0.05) between 0.0938 and 0.560 wk(-1) and 0.182 and 0.401 wk(-1), for cis- and trans-DCE, respectively, for the various treatments employed. A combination of biostimulation and bioaugmentation significantly increased the biodegradation of both compounds within two weeks; 14% for cis-DCE and 18% for trans-DCE degradation, above those observed in untreated soil and water samples. These findings support the use of a combination of biostimulation and bioaugmentation for the efficient biodegradation of these compounds in contaminated soil and water. In addition, the results clearly demonstrate that while naturally occurring microorganisms are capable of aerobic biodegradation of cis- and trans-DCE, biotransformation may be affected by several factors, including isomer structure, soil type, and the amount of nutrients available in the water and soil. (c) 2005 Elsevier Ltd. All rights reserved. |
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Biostimulation and bioaugmentation enhances aerobic biodegradation of dichloroethenes; Wos:000237379500007; Times Cited: 0; ISI Web of Science |
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CBU @ c.wolke @ 16936 |
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111 |
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Totsche, O.; Fyson, A.; Kalin, M.; Steinberg Christian, E.W. |
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Title |
Titration curves: A useful instrument for assessing the buffer systems of acidic mining waters |
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Journal Article |
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2006 |
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ESPR Environmental Science and Pollution Research |
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13 |
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4 |
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215-224 |
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Abwasseraufbereitung Bergbau Titration Säuregehalt Grundwasser Pufferlösung Neutralisation Titrationskurve Bergbauabwasser |
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The acidification of mine waters is generally caused by metal sulfide oxidation, related to mining activities. These waters are characterized by low pH and high acidity due to strong buffering systems. The standard acidity parameter, the BNC (Base Neutralization Capacity), is determined by endpoint titration, and reflects a cumulative parameter of both hydrogen ions and all buffering systems, but does not give information on the individual buffer systems. It is demonstrated that a detailed interpretation of titration curves can provide information about the strength of the buffering systems. The buffering systems are of importance for environmental studies and treatment of acidic mining waters. Titrations were carried out by means of an automatic titrator using acidic mining waters from Germany and Canada. The curves were interpreted, compared with each other, to endpoint titration results and to elemental concentrations contained therein. The titration curves were highly reproducible, and contained information about the strength of the buffer systems present. Interpretations are given, and the classification and comparison of acidic mining waters, by the nature and strength of their buffering systems derived from titration curves are discussed. The BNC-values calculated from the curves were more precise than the ones determined by the standard endpoint titration method. Due to the complex buffer mechanisms in acidic mining waters, the calculation of major metal concentrations from the shape of the titration curve resulted in estimates, which should not be confused with precise elemental analysis results. Conclusion. Titration curves provide an inexpensive, valuable and versatile tool, by which to obtain sophisticated information of the acidity in acidic water. The information about the strength of the present buffer systems can help to understand and document the complex nature of acidic mining water buffer systems. Finally, the interpretation of titration curves could help to improve treatment measurements and the ecological understanding of these acidic waters. |
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Leibniz-Institut für Gewässerökologie und Binnenfischerei, Berlin, DE; Boojum Research, Toronto, CA; Humboldt-Universität Berlin, DE |
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0944-1344 |
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Titration curves: A useful instrument for assessing the buffer systems of acidic mining waters; 39481, BERG , 13.11.06; Words: 519; 200610 05282; 10 Seiten, 15 Bilder, 2 Tabellen, 39 Quellen 3UXX *Belastung von Wasser, Wasserreinhaltung, Abwasser* 3BX *chemische Grundlagen* 3IFC *Messung und Prüfung chemischer Größen, chemische Analytik* 3MZ *Bergbau, Tunnelbau, Erdöl /Erdgasförderung, Bohrtechnik*; BERG, Copyright FIZ Technik e.V.; EN Englisch |
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CBU @ c.wolke @ 17580 |
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224 |
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