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首页> 外文期刊>Desalination and water treatment >Turbidity and pH dissipations in a dosage of high concentration NaOH solution to seawater
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Turbidity and pH dissipations in a dosage of high concentration NaOH solution to seawater

机译：一定浓度的高浓度NaOH溶液对海水的浊度和pH耗散

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摘要

It is sometimes necessary to dose into a desalination feed stream a caustic solution to achieve a controlled pH increase, as, for example, in the application of boron suppression measures. To restrict the size of the caustic feed system, the NaOH is dosed from a high concentration solution. The solution is injected at the center of the raw water feed pipe and its concentration dissipates as it mixes with the main flowing solution. The problem is that desalination feed waters usually contain ions of a sparingly soluble salt such as CaCO_3 and Mg(OH)_2, which tend to precipitate at high pH levels. The very high local concentrations of the dosed NaOH at the injection region can lead to very high local supersaturations and induce the nucleation and precipitation of scale particles. The main goal of the present work was to delineate flow and concentration conditions at which dosage of a concentrated NaOH solution to seawater concentrates will not induce significant precipitation of CaCO_3 and Mg (OH)_2.
机译：有时有必要将苛性溶液加入脱盐进料流中，以实现受控的pH值增加，例如在采用硼抑制措施时。为了限制苛性碱进料系统的大小，需要从高浓度溶液中加入NaOH。溶液被注入到原水进料管的中心，当它与主流溶液混合时，其浓度就会消散。问题在于，脱盐给水通常包含微溶盐离子，例如CaCO_3和Mg（OH）_2，它们倾向于在高pH值下沉淀。在注入区域中，NaOH的局部浓度非常高，会导致局部过饱和度很高，并导致水垢颗粒成核和沉淀。本工作的主要目的是描述流量和浓缩条件，在该条件下，将浓NaOH溶液添加到海水浓缩物中不会引起CaCO_3和Mg（OH）_2的大量沉淀。

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  • 来源
    《Desalination and water treatment》 |2013年第9期|1641-1650|共10页
  • 作者

    V. Kesler; D. Hasson; H. Shemer; R. Semiat; C. Bartels; M. Wilf;

  • 作者单位

    Rabin Desalination Laboratory, Technion-Israel Institute of Technology, Haifa, Israel;

    Rabin Desalination Laboratory, Technion-Israel Institute of Technology, Haifa, Israel;

    Rabin Desalination Laboratory, Technion-Israel Institute of Technology, Haifa, Israel;

    Rabin Desalination Laboratory, Technion-Israel Institute of Technology, Haifa, Israel;

    Hydranautics, Research and Development, Oceanside, CA, USA;

    Consultant RO Technology, San Diego, CA, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    seawater; NaOH dosage; desalination; scale precipitation; dissipation model;

    机译：海水;NaOH用量;海水淡化规模降水;耗散模型;

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