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首页> 外文期刊>Environmental Science & Technology >Chemical-Free Recovery of Elemental Selenium from Selenate- Contaminated Water by a System Combining a Biological Reactor, a Bacterium-Nanoparticle Separator, and a Tangential Flow Filter
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Chemical-Free Recovery of Elemental Selenium from Selenate- Contaminated Water by a System Combining a Biological Reactor, a Bacterium-Nanoparticle Separator, and a Tangential Flow Filter

机译：通过组合生物反应器，细菌-纳米颗粒分离器和切向流过滤器的系统从硒酸盐污染的水中无元素硒的化学回收

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摘要

Biological selenate (SeO42-) reduction to elemental selenium nanoparticles (SeNPs) has been intensively studied but little practiced because of the additional cost associated with separation of SeNPs from water. Recovery of the SeNPs as a valuable resource has been researched to make the approach more competitive. Separation of the intracellular SeNPs from the biomass usually requires the addition of chemicals. In this research, a novel approach that combined a biological reactor, a bacterium-SeNP separator, and a tangential flow ultrafiltration module (TFU) was investigated to biologically reduce selenate and separate the SeNPs, biomass, and water from each other. This approach efficiently removed and recovered selenium while eliminating the use of chemicals for separation. The three units in the approach worked in synergism to achieve the separation and recovery. The TFU module retained the biomass in the system, which increased the biomass retention time and allowed for more biomass decay through which intracellular SeNPs could be released and recovered. SeNP aggregates were separated from bacterial aggregates due to their different interactions with a tilted polyethylene sheet in the bacterium-SeNP separator. SeNP aggregates stayed on the polyethylene sheet while bacterial aggregates settled down to the bottom of the separator.
机译：深入研究了将生物硒酸盐（SeO42-）还原为元素硒纳米颗粒（SeNPs），但由于与从水中分离SeNPs相关的额外成本，因此几乎没有实践。已经研究了将SeNP回收为有价值的资源，以使该方法更具竞争力。从生物质中分离出细胞内SeNPs通常需要添加化学物质。在这项研究中，研究了一种将生物反应器，细菌-SeNP分离器和切向流超滤模块（TFU）相结合的新方法，以生物还原硒酸盐并将SeNPs，生物质和水彼此分离。这种方法有效地去除和回收了硒，同时消除了用于分离的化学物质的使用。该方法中的三个单元协同工作以实现分离和回收。 TFU模块将生物质保留在系统中，这增加了生物质的保留时间，并允许更多的生物质衰变，从而可以释放和回收细胞内SeNP。由于SeNP聚集体与细菌-SeNP分离器中倾斜的聚乙烯薄片的相互作用不同，因此它们从细菌聚集体中分离出来。 SeNP聚集体留在聚乙烯板上，而细菌聚集体沉降到分离器底部。

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  • 来源
    《Environmental Science & Technology》 |2018年第22期|13231-13238|共8页
  • 作者

    Zhang Zhiming; Adedeji Itunu; Chen Gang; Tang Youneng;

  • 作者单位

    Florida State Univ, Dept Civil & Environm Engn, FAMU FSU Coll Engn, 2525 Pottsdamer St, Tallahassee, FL 32310 USA;

  • 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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  • 正文语种 eng
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