Theoretical Study of the Influence of Electroconvection on the Efficiency of Pulsed Electric Field (PEF) Modes in ED Desalination.

IF 3.3 4区 工程技术 Q2 CHEMISTRY, PHYSICAL
Victor Nikonenko, Aminat Uzdenova, Anna Kovalenko, Makhamet Urtenov
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引用次数: 0

Abstract

Pulsed electric field (PEF) modes of electrodialysis (ED) are known for their efficiency in mitigating the fouling of ion-exchange membranes. Many authors have also reported the possibility of increasing the mass transfer/desalination rate and reducing energy costs. In the literature, such possibilities were theoretically studied using 1D modeling, which, however, did not consider the effect of electroconvection. In this paper, the analysis of the ED desalination characteristics of PEF modes is carried out based on a 2D mathematical model including the Nernst-Planck-Poisson and Navier-Stokes equations. Three PEF modes are considered: galvanodynamic (pulses of constant electric current alternate with zero current pauses), potentiodynamic (pulses of constant voltage alternate with zero voltage pauses), and mixed galvanopotentiodynamic (pulses of constant voltage alternate with zero current pauses) modes. It is found that at overlimiting currents, in accordance with previous papers, in the range of relatively low frequencies, the mass transfer rate increases and the energy consumption decreases with increasing frequency. However, in the range of high frequencies, the tendency changes to the opposite. Thus, the best characteristics are obtained at a frequency close to 1 Hz. At higher frequencies, the pulse duration is too short, and electroconvective vortices, enhancing mass transfer, do not have time to develop.

电对流对 ED 海水淡化中脉冲电场 (PEF) 模式效率影响的理论研究。
众所周知,脉冲电场(PEF)电渗析(ED)模式可有效减轻离子交换膜的污垢。许多学者还报告了提高传质/脱盐率和降低能源成本的可能性。文献中使用一维建模对这种可能性进行了理论研究,但没有考虑电对流的影响。本文基于包括 Nernst-Planck-Poisson 和 Navier-Stokes 方程在内的二维数学模型,对 PEF 模式的 ED 海水淡化特性进行了分析。考虑了三种 PEF 模式:电动力模式(恒定电流脉冲与零电流停顿交替)、电位动力模式(恒定电压脉冲与零电压停顿交替)和混合电位动力模式(恒定电压脉冲与零电流停顿交替)。研究发现,与以前的论文一样,在超限电流下,在相对较低的频率范围内,随着频率的增加,传质率增加,能耗减少。然而,在高频率范围内,趋势则相反。因此,在频率接近 1 赫兹时,可获得最佳特性。在较高频率下,脉冲持续时间太短,加强传质的电对流漩涡来不及形成。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Membranes
Membranes Chemical Engineering-Filtration and Separation
CiteScore
6.10
自引率
16.70%
发文量
1071
审稿时长
11 weeks
期刊介绍: Membranes (ISSN 2077-0375) is an international, peer-reviewed open access journal of separation science and technology. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided.
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