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首页> 外文期刊>Journal of industrial and engineering chemistry >The evaluation on concentration polarization for effective monitoring of membrane fouling in seawater reverse osmosis membrane system
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The evaluation on concentration polarization for effective monitoring of membrane fouling in seawater reverse osmosis membrane system

机译：有效监测海水反渗透膜系统中膜污染的浓度极化评价

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One of the critical issues for the successful application of seawater reverse osmosis (SWRO) in the desalination processes is membrane fouling. However, it is difficult to evaluate fouling by the flux decline since recently commercialized SWRO membranes have better permeability than the initial membranes and the two-way coupling between salt concentration polarization and fouling influences permeate flux. In this study, we evaluated membrane performance using various factors, namely the permeation coefficient (L_p) and concentration polarization factor (f_(cp) ). The values of L_p and f_(cp) were obtained according to the changing conditions of feed water total dissolved solids (TDS) concentration and operating pressure. As a result, L_p and f_(cp) increased with increasing operating pressure at the same feed water TDS, on the other hand, they decreased with increasing feed water TDS at the same operating pressure. The reasons for these results are that concentration polarization is enhanced with increasing operating pressure at the same feed water TDS and concentration polarization is weakened with increasing feed water TDS concentration due to osmotic pressure at the same operating pressure. Based on these factors and the equation combined with osmotic cake filtration theory and thermodynamic model, we could calculate the resistance by NaCl (R_(cp) ), which is constant with time like membrane resistance (R_m). Thus, we would identify the fouling rate through fouling resistance (R_c) by calculating L_p and f_(cp) according to time after spiking organic foulants.
机译：在海水淡化过程中成功应用海水反渗透（SWRO）的关键问题之一是膜污染。然而，由于最近商业化的SWRO膜比初始膜具有更好的渗透性，并且盐浓度极化和结垢之间的双向耦合影响渗透通量，因此很难通过通量下降来评估结垢。在这项研究中，我们使用各种因素（即渗透系数（L_p）和浓度极化因子（f_（cp）））评估了膜的性能。 L_p和f_（cp）的值是根据给水总溶解固体（TDS）浓度和工作压力的变化条件获得的。结果，在相同的给水TDS下，L_p和f_（cp）随着工作压力的增加而增加，另一方面，在相同的工作压力下，L_p和f_（cp）随着给水TDS的增加而降低。这些结果的原因是，由于在相同的工作压力下的渗透压，在相同的给水TDS下，随着操作压力的增加，浓度极化增强;而随着渗透的压力，在给水TDS的浓度升高，浓度极化被减弱。基于这些因素以及结合渗透滤饼过滤理论和热力学模型的方程，我们可以通过NaCl（R_（cp））来计算电阻，该电阻像膜电阻（R_m）一样随时间恒定。因此，我们将通过在掺入有机污垢剂后根据时间计算L_p和f_（cp）来通过污垢阻力（R_c）来确定污垢率。

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