Biostimulation of indigenous microbes for uranium bioremediation in former U mine water: multidisciplinary approach assessment
Environmental Science and Pollution Research(2024)
摘要
Characterizing uranium (U) mine water is necessary to understand and design an effective bioremediation strategy. In this study, water samples from two former U-mines in East Germany were analysed. The U and sulphate (SO 4 2− ) concentrations of Schlema-Alberoda mine water (U: 1 mg/L; SO 4 2− : 335 mg/L) were 2 and 3 order of magnitude higher than those of the Pöhla sample (U: 0.01 mg/L; SO 4 2− : 0.5 mg/L). U and SO 4 2− seemed to influence the microbial diversity of the two water samples. Microbial diversity analysis identified U(VI)-reducing bacteria (e.g. Desulfurivibrio ) and wood-degrading fungi (e.g. Cadophora ) providing as electron donors for the growth of U-reducers. U-bioreduction experiments were performed to screen electron donors (glycerol, vanillic acid, and gluconic acid) for Schlema-Alberoda U-mine water bioremediation purpose. Thermodynamic speciation calculations show that under experimental conditions, U(VI) is not coordinated to the amended electron donors. Glycerol was the best-studied electron donor as it effectively removed 99% of soluble U, 95% of Fe, and 58% of SO 4 2− from the mine water, probably by biostimulation of indigenous microbes. Vanillic acid removed 90% of U, and no U removal occurred using gluconic acid.
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关键词
Mine water,Uranium,Bacterial communities,Fungal communities,Bioremediation,Electron donors,Glycerol,Bioreduction
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