To solve the problems of high specific energy consumption and excessive harmful ions in the water production of a small reverse osmosis (RO) plant, a desalination system coupling RO and membrane capacitive deionization (MCDI) is proposed in this study. Aiming at producing two cubic meters per day of fresh water with a salt concentration of less than 280 mg L⁻¹, parameter matching optimization was carried out on two desalination system schemes of one-stage two-section RO and one-stage three-section RO coupled with MCDI. The results were compared with the parameter matching optimization results of the one-stage one-section RO and the one-stage two-section pure RO desalination system. The results show that compared with the pure RO desalination mode, the seawater desalination mode coupled with RO and MCDI reduces the specific energy consumption under the same effluent salt concentration. Moreover, it decreases the feed water pressure in front of the RO membrane, which can reduce the standard of high-pressure pump in a small seawater desalination plant. The energy consumption of the one-stage three-section RO and MCDI coupling system is lower than that of the one- stage two-section RO and MCDI coupling system, and the feed water pressure is also lower.

中文翻译：

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RO和MCDI小型海水淡化厂及其性能仿真分析与优化

为了解决小型反渗透（RO）厂水生产中比能耗高和有害离子过多的问题，本研究提出了一种将RO与膜电容去离子（MCDI）结合的脱盐系统。旨在每天生产两立方米的淡水，盐浓度低于280 mg L ^-1，对一阶段两段式反渗透和一阶段三段式反渗透与MCDI结合的两种脱盐系统方案进行了参数匹配优化。将该结果与一阶段一区反渗透和一阶段两区纯反渗透脱盐系统的参数匹配优化结果进行了比较。结果表明，与纯RO脱盐模式相比，在相同的出水盐浓度下，结合RO和MCDI的海水脱盐模式降低了单位能耗。而且，它降低了反渗透膜前面的给水压力，这会降低小型海水淡化厂中高压泵的标准。