Saline Brine Separation: Thermodynamic and Techno-Economic Comparison of Counterflow Reverse Osmosis with Electrodialysis,Industrial & Engineering Chemistry Research

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Saline Brine Separation: Thermodynamic and Techno-Economic Comparison of Counterflow Reverse Osmosis with Electrodialysis
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2024-09-13 , DOI: 10.1021/acs.iecr.4c01644
Chirag G. Patel ₁ , Priyanshu R. Gupta ₂ , Jaichander Swaminathan ₃

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Separation into a more concentrated and a diluted stream is an energy-efficient alternative to thermal distillation for saline brine management. Here, we compare counterflow reverse osmosis (CFRO) with electrodialysis (ED) for brine separation in terms of energy consumption and overall treatment cost. Conditions for energy-optimal thermodynamically equipartitioned operation are derived for both technologies. The brine-reflux CFRO configuration requires more energy/module area than does the split-feed design but can be operated at practical pressure levels for high-salinity applications. After identification of the cost-optimal voltage in ED and pressure in CFRO, realistic single-stage systems, including losses, are compared. CFRO consumes significantly lower energy and is less expensive than ED for intermediate-salinity brine separation, such as textile dyeing effluent recycling. Therefore, this is an ideal beachhead application for CFRO compared to seawater brine concentration up to near saturation, where its cost is comparable to that of ED.

中文翻译：

盐水分离：逆流反渗透与电渗析的热力学和技术经济比较

分离成更浓缩和稀释的流是用于盐水管理的热蒸馏的一种节能替代方案。在这里，我们比较了用于盐水分离的逆流反渗透 (CFRO) 和电渗析 (ED) 的能耗和总体处理成本。两种技术都推导了能量最佳热力学均分操作的条件。盐水回流 CFRO 配置比分流进料设计需要更多的能量/模块面积，但可以在高盐度应用的实际压力水平下运行。在确定 ED 中的成本最优电压和 CFRO 中的压力后，对实际的单级系统（包括损耗）进行比较。对于中盐度盐水分离（例如纺织印染废水回收），CFRO 消耗的能源显着降低，并且比 ED 更便宜。因此，与海水盐水浓度接近饱和相比，这是 CFRO 的理想滩头应用，其成本与 ED 相当。

更新日期：2024-09-13

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