Records |
Author |
Külls, C.H.; Eichinger, F.; Fader, H.J.; Leistert, H.; Lorenz, G.; Szakacs, E. |
Title |
New Environmental Analytical Techniques to Monitor Carbon Sequestration |
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Conference Article |
Year |
2011 |
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1st EAGE Sustainable Earth Sciences (SES) Conference and Exhibition |
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268 |
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European Association of Geoscientists & Engineers |
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THL @ christoph.kuells @ Kuells2011new |
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47 |
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Author |
Külls, C. |
Title |
Rekonstruktion hydrologischer Extreme in der Namibwüste |
Type |
Journal Article |
Year |
2011 |
Publication ![sorted by Publication field, ascending order (up)](img/sort_asc.gif) |
Berichte der naturforschenden Gesellschaft zu Freiburg im Breisgau |
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101 |
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69-81 |
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THL @ christoph.kuells @ |
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71 |
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Author |
Klimkova, S.; Cernik, M.; Lacinova, L.; Filip, J.; Jancik, D.; Zboril, R. |
Title |
Zero-valent iron nanoparticles in treatment of acid mine water from in situ uranium leaching |
Type |
Journal Article |
Year |
2011 |
Publication ![sorted by Publication field, ascending order (up)](img/sort_asc.gif) |
Chemosphere |
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Volume |
82 |
Issue |
8 |
Pages |
1178-1184 |
Keywords |
Acid mine water, Contaminant removal, Surface stabilizing shell, Water treatment, Zero-valent iron nanoparticles |
Abstract |
Acid mine water from in situ chemical leaching of uranium (Straz pod Ralskem, Czech Republic) was treated in laboratory scale experiments by zero-valent iron nanoparticles (nZVI). For the first time, nZVI were applied for the treatment of the real acid water system containing the miscellaneous mixture of pollutants, where the various removal mechanisms occur simultaneously. Toxicity of the treated saline acid water is caused by major contaminants represented by aluminum and sulphates in a high concentration, as well as by microcontaminants like As, Be, Cd, Cr, Cu, Ni, U, V, and Zn. Laboratory batch experiments proved a significant decrease in concentrations of all the monitored pollutants due to an increase in pH and a decrease in oxidation–reduction potential related to an application of nZVI. The assumed mechanisms of contaminants removal include precipitation of cations in a lower oxidation state, precipitation caused by a simple pH increase and co-precipitation with the formed iron oxyhydroxides. The possibility to control the reaction kinetics through the nature of the surface stabilizing shell (polymer vs. FeO nanolayer) is discussed as an important practical aspect. |
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0045-6535 |
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THL @ christoph.kuells @ klimkova_zero-valent_2011 |
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196 |
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Author |
Frey, S.; Külls, C.; Schlosser, C. |
Title |
New Hydrological Age-Dating techniques using cosmogenic radionuclides Beryllium-7 and Sodium-22 |
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Conference Article |
Year |
2011 |
Publication ![sorted by Publication field, ascending order (up)](img/sort_asc.gif) |
Proc. IAEA Conf. Monacco |
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THL @ christoph.kuells @ Frey2011new |
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48 |
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Author |
Hu, K.; Wang, Q.; Tao, G.; Wang, A.; Ding, D. |
Title |
Experimental Study on Restoration of Polluted Groundwater from in Situ Leaching Uranium Mining with Sulfate Reducing Bacteria and ZVI-SRB |
Type |
Journal Article |
Year |
2011 |
Publication ![sorted by Publication field, ascending order (up)](img/sort_asc.gif) |
Procedia Earth and Planetary Science |
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2 |
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Pages |
150-155 |
Keywords |
In situ leaching of uranium, nitrate radical, sulfate radical, Sulfate-Reducing Bacteria (SRB), Zero Valent Iron (ZVI) |
Abstract |
In the case of in situ leaching of uranium, the primitive geochemical environment for groundwater is changed since leachant is injected into the water beaving uranium deposit. This increases the concentration of uranium and results in the groundwater contamination.Microbial reduction technology by Sulfate reducing bacteria and Zero Valent Iron were employed to treat uranium wastewater. The experiments were conducted to evaluate the influence of anion (sulfate and nitrate) on dealing with uranium wastewater. Experimental results show that the utilization of both SRB system and ZVI – SRB system to process uranium wastewater is affected by sulfate ion and nitrate ion. As the concentration of sulfate radical is lower than 4000mg/L, sulfate-reducing bacteria has no influence on precipitated uranium. However, as the concentration of sulfate is more than 6,000mg/L, uranium removal rate decreases significantly, from 80% to 14.1%. When adding sulfate radical on ZVI – SRB system to process uranium wastewater, its uranium removal rate is higher than SRB system. Low concentration of nitrate contributes to reduction metabolism of SRB. High concentration of nitrate inhibits the growth and metabolism of SRB and affects the treatment efficiency of uranium wastewater. When the concentration of nitrate reaches 1500mg/L, uranium removal rate is less than 0.1%. Nevertheless, as the concentration of nitrate is lower than 1000mg/L, uranium removal rate could reach more than 75%. As existence of nitrate radical, uranium removal rate of SRB by adding ZVI is higher than that without adding. |
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1878-5220 |
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THL @ christoph.kuells @ hu_experimental_2011 |
Serial |
202 |
Permanent link to this record |