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Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/3F08AAC0-2D2B-4345-BCB4-3F624086554C | ||
| Year | 1998 | ||
| Type of Item | Conference Full Paper | ||
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| Bibliographic Citation | S. Groudev, A. Kontopoulos, I. Spasova, K. Komnitsas, A. Angelov, P. Georgiev, "Ιn situ treatment of groundwater at Burgas Copper Mines, Bulgaria, by enhancing microbial sulphate reduction," in Proceedings of International Conference on Groundwaters Quality: Remediation and Protection, 1998, pp. 249-255. | ||
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The groundwater in the area near the tailings ponds at the BurgasCopper Mines, Bulgaria, is contaminated with radionuclides, sulphates andtoxic heavy metals (mainly copper, lead, molybdenum and manganese) bydrainage waters from the pond. The groundwater level and the quality ofgroundwater were monitored regularly by a system of piezometers. It wasfound that natural cleanup processes took place during groundwater flow.The main cleanup process is the microbial dissimilatory sulphate reductioncarried out by the indigenous sulphate-reducing bacteria. The hydrogensulphide, produced as a result of this process, reduced the hexavalenturanium to the insoluble tetravalent state and precipitated the heavy metalions as the relevant insoluble sulphides. The in situ activity of the sulphatereducingbacteria was enhanced by adding nutrients (soluble organic matter,ammonium and phosphate ions) to the groundwater through injectionboreholes. The concentration of pollutants decreased below the permissiblelevels after such treatment.
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