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首页> 外文会议>Hard choices: adapting policy and management to water scarcity proceedings >Desalination in a Pilot-Scale Electrodialysis Process: Selective Removal of Divalent Ions in Comparison with Monovalent Ions
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Desalination in a Pilot-Scale Electrodialysis Process: Selective Removal of Divalent Ions in Comparison with Monovalent Ions

机译：中试电渗析中的脱盐：与单价离子比较选择性去除二价离子

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Desalination as an artificial process by which saline/brackish water is converted to fresh water is consideredrnas a solution to global drinking water crisis. Electrodialysis (ED) is a membrane based separation processrnin which the partial separation of the components of an electrolyte solution occurs due to applied electricalrnvoltage. Although Electrodialysis Reversal (EDR) technology has been commercially used since the earlyrn1960s, the fundamental understanding of this technology is not fully developed. Groundwater resources,rnwhich are very important sources of drinking water in many parts of the world as well as southwest regionrnof the United States, have various water chemistries. Therefore, ions with higher levels preferentially shouldrnbe removed selectively, since most of the other ions exist within acceptable range based on drinking waterrnstandards. In this study, selective removal of different divalent cations and anions using pilot-scale EDRrnhas been studied. The experiments were done at different levels of temperature, linear velocity, feed waterrnconductivity and applied voltage. The EDR pilot scale set up has been installed in Brackish Ground WaterrnDesalination Research Facility, BGNDRF, located in Alamogordo, New Mexico. The EDR stack was composedrnof 40 cell pairs in which CR67 and AR204 were used as cation and anion exchange membrane, respectively.rnThe obtained results show that the CR67 and AR908 membranes remove divalent cations (such as calcium)rnand anions (such as sulfate) better than monovalent ions at various operating conditions, respectively.rnHowever, the selectivity values of the EDR process depend on the experiment operating condition.
机译：作为将盐水/微咸水转化为淡水的人工过程，脱盐被认为是解决全球饮用水危机的一种方法。电渗析（ED）是一种基于膜的分离工艺，由于施加的电压，会发生电解质溶液成分的部分分离。尽管自1960年代初以来电渗析逆转（EDR）技术已在商业上使用，但是对该技术的基本了解还没有得到充分发展。在世界许多地区以及美国西南地区，地下水资源是非常重要的饮用水来源，其水化学特征多种多样。因此，优先选择具有较高水平的离子，因为根据饮用水标准，大多数其他离子都在可接受的范围内。在这项研究中，已经研究了使用中试规模的EDRrn选择性去除不同的二价阳离子和阴离子。在不同水平的温度，线速度，进料水电导率和施加电压下进行了实验。 EDR中试规模的设置已安装在位于新墨西哥州阿拉莫戈多的咸淡水淡化研究设施BGNDRF中。 EDR堆栈由40个细胞对组成，其中CR67和AR204分别用作阳离子和阴离子交换膜。获得的结果表明，CR67和AR908膜能更好地去除二价阳离子（如钙）和阴离子（如硫酸盐）。然而，EDR工艺的选择性值取决于实验操作条件。

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  • 会议地点 Las Cruces NM(US)
  • 作者

    Leila Karimi; Ali Sharbat; Neil Moe; Jim Loya; Abbas Ghassemi;

  • 作者单位

    Institute for Energy and The Environment, NMSU, 1060 Frenger Mall, Suite 300, New Mexico State University, Las Cruces, NM lkarimi@nmsu.edu, 575-464-3075 575-464-3075;

    Institute for Energy and The Environment, New Mexico State University, 1060 Frenger Mall, Suit 300, New Mexico State University, Las Cruces, NM sharbat@nmsu.edu, 575-646-5045 575-646-5045;

    GE Water and Process Technology Visiting Scientist in New Mexico State University, 1060 Frenger Mall, Suit 300, New Mexico State University, Las Cruces, NM Neil.Moe@ge.com, 575-646-1731 575-646-1731;

    Program Manager in Institute for Energy and The Environment, New Mexico State University, 1060 Frenger Mall, Suit 300, New Mexico State University, Las Cruces, NM jloya@nmsu.edu, 575-646-6305 575-646-6305;

    WERC/IEE, Chemical Engineering, New Mexico State University, 1060 Frenger Mall Suit 300, New Mexico State University, Las Cruces, NM aghassem@nmsu.edu, 575-646-2357 575-646-2357;

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