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首页> 外文期刊>Environmental Science & Technology >Removal of Hexavalent Chromium by Biosorption Process in Rotating Packed Bed
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Removal of Hexavalent Chromium by Biosorption Process in Rotating Packed Bed

机译：旋转填充床中生物吸附法去除六价铬

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摘要

Removal ofhexavalent chromium ions from an aqueous solution by crude tamarind (Tamarindus indica) fruit shell was examined in a rotating packed bed contactor by continuously redrculating a given volume of solution through the bed. Reduction of Cr(Vl) to Cr(IIl) within the biosorbent appeared to be the removal mechanism. Depletion rate of Cr(VI) from, and release of reduced Cr(III) ions into the aqueous phase, was influenced by mass transfer resistance besides pH and packing depth. A mathematical model considering the reduction reaction to be irreversible and incorporating intraparticle and external phase mass transfer resistances represented the experimental data adequately. The study indicated that the limitations of fixed bed contactor operating under terrestrial gravity in intensifying mass transfer rates for this system can be overcome with rotating packed bed due to liquid flow under centrifugal acceleration.
机译：在旋转的填充床接触器中，通过不断地降低床中给定体积的溶液，检查了粗罗望子（Tamarindus indica）果壳从水溶液中去除六价铬离子的情况。生物吸附剂中的Cr（VI）还原为Cr（II1）似乎是去除机理。除pH和堆积深度外，传质阻力还影响了Cr（VI）的消耗速率以及还原的Cr（III）离子向水相的释放。考虑到还原反应是不可逆的并且结合了颗粒内和外相传质阻力的数学模型充分地代表了实验数据。研究表明，在地面重力作用下固定床接触器在提高该系统的传质速率方面的局限性可以通过旋转填充床来克服，这是由于离心力作用下的液体流动所致。

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  • 来源
    《Environmental Science & Technology》 |2011年第19期|p.8460-8466|共7页
  • 作者

    M. Panda; A. Bhowal; S. Datta;

  • 作者单位

    Department of Chemical Engineering, Jadavpur University, Kolkata 700032, India;

    Department of Chemical Engineering, Jadavpur University, Kolkata 700032, India;

    Department of Chemical Engineering, Jadavpur University, Kolkata 700032, India;

  • 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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