Comparative Study of Lanthanum, Vanadium, and Uranium Bioremoval Using Different Types of Microorganisms
2018
Safonov, Alexey | Tregubova, Varvara | Ilin, Viktor | Boldyrev, Kirill | Zinicovscaia, Inga | Frontasyeva, Marina | Khijniak, Tatiana
Wastewater, containing vanadium, uranium, and lanthanum are produced by mining, nuclear, and other industries. Bacteria Pseudomonas putida, Halomonas mono, and cyanobacterium Spirulina platensis were used for lanthanum, vanadium, and uranium, removal from aqueous solutions by means of biosorption and bioreduction processes. A rapid rate of metal adsorption was observed within the first 5–15 min of the reaction. The pseudo-first-order model was found to correlate well with the experimental data. Bacteria show higher metal biosorption in comparison with cyanobacteria. The strong involvement of carboxyl, hydroxyl, carboxyl, and amide groups in studied metal binding was ascertained by FT-IR spectroscopy. Bioreduction studies carried out with Pseudomonas putida and Halomonas mono cells showed highness of metal reduction in alkaline conditions, resulting in the bioreduction of 69 and 85% of vanadate ions and 48 and 64% of uranyl ions, respectively. Using geochemical modeling, the insoluble metal phases were determined.
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