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Author |
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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Abstract |
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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Wiessner, A.; Kuschk, P.; Buddhawong, S.; Stottmeister, U.; Mattusch, J.; Kästner, M. |
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Title |
Effectiveness of various small-scale constructed wetland designs for the removal of iron and zinc from acid mine drainage under field conditions |
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Journal Article |
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2006 |
Publication |
Engineering in Life Sciences |
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6 |
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6 |
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584-592 |
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Grubenentwässerung biologische-Abwasserreinigung Pflanze Zink Eisen Schwermetallentfernung Nassverfahren Grundwasserströmung Langzeitversuch Regen Prozesswirkungsgrad Reaktionsgeschwindigkeit Binsen Hydrokultur |
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A system of planted and implanted small-scale SSF (subsurface flow) and SF (surface flow) constructed wetlands together with HP (hydroponic systems) were installed to compare the removal efficiencies of Fe and Zn from AMD (acid mine drainage) under long-term field conditions. Maximum removal of 94 % – 97 % (116 mg/m(exp 2)/d – 142 mg/m(exp 2)/d) for Fe and 69 % – 77 % (6.2 mg/m(exp 2)/d – 7.9 mg/m(exp 2)/d) for Zn was calculated for the planted soil systems. The planted SSF was most sensitive to heavy rain fall. Short-term increases of the metal concentration in the outflows, short-term breakdowns of the Fe removal and continual long-term breakdowns of the Zn removal were observed. In contrast to Zn removal, all wetland types are applicable for Fe removal with maximum removal in the range of 60 % – 98 %. Most of the removed Fe and Zn was transformed and deposited inside the soil bed. The amount absorbed by the plants (0.03 % to 0.3 %) and gravel-associated soil beds (0.03 % to 1.7 %) of the total input were low for both metals. The response of the planted SSF to rainfall suggests a remobilisation of metals accumulated inside the rhizosphere and the importance of buffering effects of the surface water layers of SF systems. The importance of plants for metal removal was shown. |
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UFZ – Umweltforschungszentrum Leipzig-Halle, DE; King Mongkut's University of Technology Thonburi (KMUTT), Bangkok, TH |
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1618-0240 |
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Effectiveness of various small-scale constructed wetland designs for the removal of iron and zinc from acid mine drainage under field conditions; 39931, BERG , 08.01.07; Words: 506; 200612 02721; 9 Seiten, 7 Bilder, 3 Tabellen, 36 Quellen 3UXX *Belastung von Wasser, Wasserreinhaltung, Abwasser* 3PZI *biologischer Abbau und Bioremediation*; BERG, Copyright FIZ Technik e.V.; EN Englisch |
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CBU @ c.wolke @ 17578 |
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211 |
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World first: Full-scale BioSure plant commissioned |
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Journal Article |
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2006 |
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Water Wheel |
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5 |
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3 |
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19-21 |
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Waste Management and Pollution Policy geographical abstracts: human geography environmental planning (70 11 5) wastewater waste facility mine waste gold mine sewage treatment |
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ERWAT's Ancor Wastewater Treatment Works on the Far East Rand commissioned a 10 Ml/day full-scale plant to treat toxic mine-water from the Grootvlei gold mine using primary sewage sludge. The R15-million plant is treating sulphate rich acid mine drainage using the Rhodes BioSURE Process. First, the pumped mine-water is treated at a high-density separation (HDS) plant to remove iron and condition pH levels. Then it is pumped two km via a newly-constructed 10 Ml capacity pipeline to the Ancor works. This mine-water is then mixed together with primary sewage sludge in a mixing tank from where a splitter box directs the material to eight biological sulphate reducing reactors or bioreactors. The overflow water which is rich in sulphide is pumped through the main pump station to another mixing box. Here, iron slurry is mixed with the material before it is again divided between four reactor clarifiers for sulphide removal. The overflow water, now containing reduced sulphate levels and virtually no sulphide is pumped to Ancor's biofilters for removal of remaining Chemical Oxygen Demand (COD) and ammonia following the conventional sewage treatment process for eventual release into the Blesbokspruit. |
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0258-2244 |
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Trade-; World first: Full-scale BioSure plant commissioned; 2865725; South-Africa; Geobase |
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CBU @ c.wolke @ 17495 |
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494 |
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Agency, U.S.E.P.; Development, O. of R. and |
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Active and semi-passive lime treatment of acid mine drainage at Leviathan Mine, California |
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RPT |
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2006 |
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94 |
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National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency |
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Cincinnati, OH |
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Mar; Active and semi-passive lime treatment of acid mine drainage at Leviathan Mine, California; file:///C:/Dokumente%20und%20Einstellungen/Stefan/Eigene%20Dateien/Artikel/7171.pdf; Opac |
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CBU @ c.wolke @ 7171 |
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62 |
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Edraki, M. |
![find record details (via OpenURL) openurl](img/xref.gif)
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Title |
Post closure management of the Mt Leyshon Gold Mine – Water the integrator |
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2006 |
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Water in Mining 2006, Proceedings |
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233-242 |
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mine water treatment |
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Mining at the Mt Leyshon Gold Mine in semi-arid north Queensland stopped in 2002. Newmont Australia has recently initiated a thorough post-closure water management study of the site by revisiting the existing information and conducting new water-related investigations. The focus of this paper. which is the first publication on post-closure environmental management of the site. is an overview of the site water quality in view of the sources and spatial distribution of polluted mine water, and also the performance of cover systems in controlling water flux though mine wastes. |
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Post closure management of the Mt Leyshon Gold Mine – Water the integrator; Isip:000243724400032; Times Cited: 0; ISI Web of Science |
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CBU @ c.wolke @ 16925 |
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150 |
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