The influence of biofilms on the migration of uranium in acid mine drainage (AMD) waters
| Autor: | U. Jenk, Vinzenz Brendler, Thuro Arnold, Evelyn Krawczyk-Bärsch, H. Lünsdorf, U. Zimmermann, E. Eisbein |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
inorganic chemicals
Environmental Engineering chemistry.chemical_element Mineralogy 010501 environmental sciences Ferrovum myxofaciens 01 natural sciences complex mixtures Mining 03 medical and health sciences chemistry.chemical_compound Environmental Chemistry Coffinite microsensor measurement Drainage Waste Management and Disposal thermodynamically calculation 0105 earth and related environmental sciences 0303 health sciences Aqueous solution 030306 microbiology Chemistry Biofilm technology industry and agriculture Betaproteobacteria Uranium Acid mine drainage Pollution AMD water Uranium sulfate Models Chemical Environmental chemistry Biofilms Thermodynamics Water Pollutants Chemical Uranophane Environmental Monitoring |
| Zdroj: | Science of the Total Environment 409(2011), 3059-3065 |
| Popis: | The uranium mine in Konigstein (Germany) is currently in the process of being flooded. Huge mass of Ferrovum myxofaciens dominated biofilms are growing in the acid mine drainage (AMD) water as macroscopic streamers and as stalactite-like snottites hanging from the ceiling of the galleries. Microsensor measurements were performed in the AMD water as well as in the biofilms from the drainage channel on-site and in the laboratory. The analytical data of the AMD water was used for the thermodynamic calculation of the predominance fields of the aquatic uranium sulfate (UO2SO4) and UO2++ speciation as well as of the solid uranium species Uranophane [Ca(UO2)(2)(SiO3OH)(2)center dot 5H(2)O] and Coffinite [U(SiO4)(1-x)(OH)(4x)], which are defined in the stability field of pH>4.8 and Eh < 960 mV and pH>0 and Eh4.8. Even analysis by Energy-filtered Transmission Electron Microscopy (EF-TEM) and electron energy loss spectroscopy (EELS) within the biofilms did not provide any microscopic or spectroscopic evidence for the presence of uranium immobilization. In laboratory experiments the first phase of the flooding process was simulated by increasing the pH of the AMD water. The results of the experiments indicated that the F. myxofaciens dominated biofilms may have a substantial impact on the migration of uranium. The AMD water remained acid although it was permanently neutralized with the consequence that the retention of uranium from the aqueous solution by the formation of solid uranium species will be inhibited. |
| Databáze: | OpenAIRE |
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