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首页> 外文期刊>Desalination: The International Journal on the Science and Technology of Desalting and Water Purification >Serially connected forward osmosis membrane elements of pressure-assisted forward osmosis-reverse osmosis hybrid system: Process performance and economic analysis
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Serially connected forward osmosis membrane elements of pressure-assisted forward osmosis-reverse osmosis hybrid system: Process performance and economic analysis

机译：串联的前期渗透膜元素的压力辅助前渗透反渗透混合系统：过程性能和经济分析

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摘要

Due to the improved dilution of draw streams, employing pressure-assisted forward osmosis (PAFO) to the hybrid system of forward osmosis (FO) followed by reverse osmosis (RO) for seawater desalination has been expected to reduce the overall economics. However, replacing FO with PAFO causes an additional energy cost in the seawater dilution step which inevitably leads to a question that PAFO-RO hybrid is truly an economically beneficial option. More importantly, though serial connection of FO elements improves the dilution of initial draw water, this economic benefit is also compensated with the additional membrane. To rationalize its overall performance and economic benefit, thorough performance and economic evaluations were conducted based on actual pilot-scale PAFO operations for serial connection of up to three 8040 FO elements. The results showed the FO-RO hybrid is not an economically feasible option unless a significant unit FO element cost cut-down is guaranteed. Meanwhile, PAFO-RO showed benefits with regards to target RO recovery and unit FO element cost, particularly when two FO elements are serially connected (SE2). It was found that PAFO-RO, indeed, has higher economic potential than FO-RO. A graphical overlapping method suggested in this work can help determine optimal serial configuration and operating conditions of PAFO-RO.
机译：由于提高了稀释流的稀释流，采用压力辅助前渗透（PAFO）向前渗透（FO）的杂交系统，然后是海水淡化的反渗透（RO），以减少整体经济学。然而，用PAFO取代FO在海水稀释步骤中导致额外的能源成本，这不可避免地导致PAFO-RO杂交品真是一种经济上有益的选择。更重要的是，虽然FO元素的串联连接改善了初始抽水的稀释，但这种经济效益也与额外的膜补偿。为了合理化其整体绩效和经济效益，基于实际试验规模PAFO操作进行了彻底的绩效和经济评估，用于串行连接最多三个8040 FO元素。结果显示FO-RO杂交品不是一种经济上可行的选择，除非保证了一个重要的单位成本降低了FO元素成本。同时，PAFO-RO对目标RO回收和单位FO元件成本表示益处，特别是当两个FO元件串联时（SE2）。发现Pafo-Ro实际上具有比FO-RO更高的经济潜力。在本工作中建议的图形重叠方法可以帮助确定PAFO-RO的最佳串行配置和操作条件。

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