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首页> 外文期刊>Desalination and water treatment >Prediction of salt rejection by nanofiltration and reverse osmosis membranes using Spiegler-Kedem model and an optimisation procedure
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Prediction of salt rejection by nanofiltration and reverse osmosis membranes using Spiegler-Kedem model and an optimisation procedure

机译：使用Spiegler-Kedem模型和优化程序预测纳滤和反渗透膜的除盐率

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摘要

Many water resources deal with the increasing of sodium and chloride concentrations above the authorized drinking water levels. In order to minimize these concentrations and to achieve a high water quality in the distribution system, membrane processes are becoming a promising technology. In this study, Reverse Osmosis (RO) and Nanofiltration (NF) have been investigated on drinking water of M'rirt city (Morocco). The influence of different operational conditions (applied pressure, recovery rate) on the removal of NaCl and using three NF membranes (NF270*4040, NF90*4040, TR60) and two RO membranes (BW30LE4040, TM710) was studied. The Spiegler-Kedem model was applied to predict the membranes removal process. Model constants are the reflection coefficient and permeability coefficient. They were optimized using the Levenberg-Marquardt algorithm which solves non-linear least-squares problems using an iterative technique. Good agreement between experimental rejection rates and model predicted rejection rates was obtained. Also, both convective and diffusive components of the solute mass transport have been calculated using another form of the basic thermodynamic equations. This allowed having a better understanding of transport phenomena and a better comparison of membranes performances.
机译：许多水资源都用于解决钠和氯化物浓度超过法定饮用水水平的问题。为了使这些浓度最小化并在分配系统中实现高水质，膜法正成为一种有前途的技术。在这项研究中，对M'rirt市（摩洛哥）的饮用水进行了反渗透（RO）和纳滤（NF）研究。研究了不同操作条件（施加压力，回收率）对NaCl去除的影响，并研究了使用三个NF膜（NF270 * 4040，NF90 * 4040，TR60）和两个RO膜（BW30LE4040，TM710）。 Spiegler-Kedem模型用于预测膜去除过程。模型常数是反射系数和渗透系数。使用Levenberg-Marquardt算法对其进行了优化，该算法使用迭代技术解决了非线性最小二乘问题。实验拒绝率与模型预测拒绝率之间取得了很好的一致性。同样，已经使用另一种形式的基本热力学方程式计算了溶质传质的对流和扩散成分。这样可以更好地理解传输现象并更好地比较膜性能。

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