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首页> 外文会议>1998 Joint Conference on the Environment, 1998, Mar 31-Apr 1, 1998, Albuquerque, NM >Uranium Bioremediation in Ground Water
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Uranium Bioremediation in Ground Water

机译：地下水中铀的生物修复

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We developed a bioremediation concept for in situ removal of uranium from ground waters. We studied a former mill tailings site near Tuba City, Arizona where the ground water contains 0.25 mg/L U, 1220 mg NO_3 and 1830 mg/L SO_4. We also tested the possibility of uranium reduction in a nitrate-contaminated (370 mg/L) ground water from an orphan site located in the South Valley of Albuquerque, New Mexico. In this water U(Ⅵ) and SO_4 were added up to 11 and 1234 mg/L, respectively, in the laboratory. Acetate, ethanol and lactate were used as electron donors. Sodium trimetaphosphate was used as phosphorus nutrient for bacterial growth. After complete denitrification by denitrifying bacteria, U(Ⅵ) was reduced to U(Ⅳ) by sulfate reducers. Final U(Ⅵ) concentrations were in the order of 1 μg/L. U(Ⅳ) precipitated as uraninite, UO_2, on bacteria surfaces. Iron sulfide precipitated as a result of Fe(Ⅲ) and SO_4 reduction. Dissolution of uraninite was slow and the long-term concentration of U(Ⅵ) in the sand column effluent is low, between 4 and 7 μg/L. Reoxidation of iron sulfide consumed most of the oxygen from ground water and protected uraninite from oxidation. These results show that U(Ⅵ) reducing bacteria are ubiquitous and can be stimulated by adding electron donors (e.g. ethanol) to the ground water and acceptors (e.g. sulfate) if necessary. Sulfate addition is necessary to reduce uranium in ground water with low sulfate concentration (e.g. <100 mg/L).
机译：我们开发了一种生物修复概念，可以从地下水中原位去除铀。我们研究了亚利桑那州图巴市附近的一个前工厂尾矿场，那里的地下水含0.25 mg / L U，1220 mg NO_3和1830 mg / L SO_4。我们还测试了位于新墨西哥州阿尔伯克基南谷一个孤儿地中硝酸盐污染（370 mg / L）的地下水中铀还原的可能性。在实验室中，该水中的U（Ⅵ）和SO_4的添加量分别高达11和1234 mg / L。乙酸盐，乙醇和乳酸盐用作电子供体。三偏磷酸钠用作细菌生长的磷营养素。通过细菌反硝化作用完成反硝化作用后，硫酸盐还原剂将U（Ⅵ）还原为U（Ⅳ）。最终的U（Ⅵ）浓度约为1μg/ L。 U（Ⅳ）在细菌表面沉淀为尿素，UO_2。 Fe（Ⅲ）和SO_4还原的结果是硫化铁沉淀。尿素的溶解较慢，而砂柱流出物中的U（Ⅵ）的长期浓度较低，在4至7μg/ L之间。硫化铁的再氧化消耗了地下水中的大部分氧气，并保护了铀矿免于氧化。这些结果表明，还原U（Ⅵ）的细菌无处不在，并且可以通过在地下水中添加电子供体（例如乙醇）和在必要时添加受体（例如硫酸盐）来刺激。添加硫酸盐对于减少硫酸盐浓度低（例如<100 mg / L）的地下水中的铀是必要的。

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