抄録
Seawater desalination has long been used as a solution to the global water shortage. The water recovery ratio of seawater desalination is about 40 ～ 45%, with the remainder being discharged into the ocean as concentrated brine. In recent years, there has been increasing attention on the resource recovery of substances such as sodium chloride and magnesium from concentrated brine. By separating and recovering these substances from concentrated brine, it becomes possible to resourcefully utilize concentrated brine. On the other hand, high concentration is essential for the resource recovery of concentrated brine. One of the high–efficiency concentration technologies developed in recent years is the osmotically assisted reverse osmosis (OARO) method. OARO is a membrane concentration technology that allows for high concentration with low energy consumption, and its development is progressing from the demonstration stage to commercialization. In this paper, in addition to the features of the OARO process, we will introduce examples of its practical application.
