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首页> 外文会议>Decentralised Water and Wastewater Systems >12.1 Performance Modeling of Full-scale Desalination Processes with Highly Permeable RO Membranes
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12.1 Performance Modeling of Full-scale Desalination Processes with Highly Permeable RO Membranes

机译：12.1具有高渗透性RO膜的大规模海水淡化过程的性能建模

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In this paper, the performance of the full-scale RO process with highly permeable membranes and the governing mechanisms were carefully studied. It was found that the performance of a full-scale RO process could be controlled by two possible mechanisms, namely mass transfer rate and thermodynamic limitations. Under relatively low driving pressure, it was controlled by mass transfer rate (water flux) of the membrane. However, with the highly permeable membrane, it is possible that the performance is limited by the thermodynamic limitation, in which the osmotic pressure becomes equal to the driving pressure inside of the membrane channel. A process controlled by thermodynamic limitation is an extremely case of the hydraulic imbalance problem. When it occurs, it means part of the membranes in the processes do not contribute to permeate production. More complicated are situations in the intermediate pressure range, in which both mechanisms contribute to, but none of them can dominate, the performance of the process. Some innovative concepts and theories on the performance of the full-scale RO processes were developed. These concepts and theories may provide better qualitative explanations for the behaviors often observed in the full-scale RO processes. A better quantitative simulations or predictions of the performance of the process were developed upon these concepts and theories. Experiments were carried out on a pilot membrane process of 6 meter membrane channel to imitate the performance of the full-scale RO under various conditions. The experimental performance data were compared with theoretical simulations and excellent agreement was obtained. Another focus of this current study was on characterization and modeling of membrane fouling in the full-scale RO process. Colloidal fouling experiments were conducted to study the fouling potential of feed water and a new fouling indicator was proposed. The indicator can be directly used in the mathematical model to simulate fouling development in the full-scale RO processes. Model simulations showed that under certain condition (thermodynamic restriction), the recovery or average permeate flux of a full-scale RO process would maintain a constant value even membrane fouling was taking place. Experimental verification of the simulation results are currently under way. With the new developments and findings in this area, methods or protocols for optimization of full-scale processes of the highly permeable RO membranes were suggested.
机译：本文详细研究了高渗透膜全规模反渗透工艺的性能及其调控机理。已经发现，可以通过两种可能的机制来控制全比例反渗透过程的性能，即传质速率和热力学极限。在相对较低的驱动压力下，它由膜的传质速率（水通量）控制。然而，对于高渗透性的膜，性能可能受到热力学限制的限制，其中渗透压变得等于膜通道内部的驱动压力。受热力学限制控制的过程是液压失衡问题的极端情况。当它发生时，这意味着过程中的部分膜不会有助于渗透物的产生。中间压力范围内的情况更为复杂，在这两种情况下，两种机理都对过程的性能有影响，但没有一个因素可以主导过程的性能。提出了一些有关全面反渗透过程性能的创新概念和理论。这些概念和理论可以为在全面反渗透过程中经常观察到的行为提供更好的定性解释。在这些概念和理论的基础上，人们对过程的性能进行了更好的定量模拟或预测。在6米膜通道的中试膜工艺上进行了实验，以模拟各种条件下满量程反渗透的性能。将实验性能数据与理论模拟进行了比较，并获得了很好的一致性。本研究的另一个重点是在全规模反渗透过程中膜污染的表征和建模。进行胶体结垢实验以研究给水的结垢潜力，并提出了一种新的结垢指示剂。该指标可直接用于数学模型中，以模拟满量程反渗透过程中的结垢情况。模型模拟表明，在一定条件下（热力学限制），即使发生膜污染，全比例反渗透工艺的回收率或平均渗透通量也将保持恒定值。仿真结果的实验​​验证目前正在进行中。随着该领域的新发展和发现，提出了用于高渗透性RO膜全规模工艺优化的方法或方案。

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