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首页> 外文期刊>Environmental Science & Technology >Influence of Iron Sulfides on Abiotic Oxidation of UO_2 by Nitrite and Dissolved Oxygen in Natural Sediments
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Influence of Iron Sulfides on Abiotic Oxidation of UO_2 by Nitrite and Dissolved Oxygen in Natural Sediments

机译：硫化铁对天然沉积物中亚硝酸盐和溶解氧对UO_2非生物氧化的影响

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摘要

Iron sulfide precipitates formed under sulfate reducing conditions may buffer U(Ⅳ) insoluble solid phases from reoxidation after oxidants re-enter the reducing zone. In this study, sediment column experiments were performed to quantify the effect of biogenic mackinawite on U(Ⅳ) stability in the presence of nitrite or dissolved oxygen (DO). Two columns, packed with sediment from an abandoned U contaminated mill tailings site near Rifle, CO, were biostimulated for 62 days with an electron donor (3 mM acetate) in the presence (BRS+) and absence (BRS-) of 7 mM sulfate. The bioreduced sediment was supplemented with synthetic uraninite (UO_2(s)), sterilized by gamma-irradiation, and then subjected to a sequential oxidation by nitrite and DO. Biogenic iron sulfides produced in the BRS+ column, mostly as mackinawite, inhibited U(Ⅳ) reoxidation and mobilization by both nitrite and oxygen. Most of the influent nitrite (0.53 mM) exited the columns without oxidizing UO_2, while a small amount of nitrite was consumed by iron sulfides precipitates. An additional 10-day supply of 0.25 mM DO influent resulted in the release of about 10% and 49% of total U in BRS+ and BRS- columns, respectively. Influent DO was effectively consumed by biogenic iron sulfides in the BRS+ column, while DO and a large U spike were detected after only a brief period in the effluent in the BRS- column.
机译：在硫酸盐还原条件下形成的硫化铁沉淀可在氧化剂重新进入还原区后，缓冲U（Ⅳ）不溶性固相，使其免受再氧化作用。在这项研究中，进行了沉淀柱实验，以量化在亚硝酸盐或溶解氧（DO）存在下，生物型麦基钠长石对U（Ⅳ）稳定性的影响。在存在（BRS +）和不存在（BRS-）有7 mM硫酸盐的情况下，用电子供体（3 mM乙酸盐）对两根装满来自废弃的受U污染的工厂污染的工厂尾矿站点沉积物的色谱柱进行生物刺激62天。经过生物还原的沉积物补充有合成的尿素矿（UO_2（s）），通过伽马射线辐照灭菌，然后依次通过亚硝酸盐和DO进行氧化。 BRS +色谱柱中产生的生物硫化铁（主要是马基钠铁矿）抑制了亚硝酸盐和氧气对U（Ⅳ）的再氧化和动员。大部分流入的亚硝酸盐（0.53 mM）在不氧化UO_2的情况下离开色谱柱，而少量亚硝酸盐被硫化铁沉淀消耗。额外的10天0.25 mM DO进水量分别导致BRS +和BRS-色谱柱中的总U释放约10％和49％。 BRS +色谱柱中的生物硫化铁有效地消耗了进水DO，而在短时间内，BRS-色谱柱中的废水中却检测到了DO和大的U峰。

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  • 来源
    《Environmental Science & Technology》 |2015年第2期|1078-1085|共8页
  • 作者

    Julian Carpenter; Yuqiang Bi; Kim F. Hayes;

  • 作者单位

    Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States;

    Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States;

    Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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