When disposed of improperly, rejected brine, a byproduct of the desalination process used in power plants, can negatively affect the environment. However, because it includes compounds that companies require, rejected brine may be a useful resource. Sustainable brine management is crucial to ensure environmental and human safety due to dynamic and complex requirements for its composition and purification. The valorization strategy changes the paradigm of rejected brine from waste into resources for various purposes. This technology can produce a NaCl solution from rejected brine to be used as an alternative raw material for the Chlor-alkali industry, especially for Indonesia company. This paper aims to compare the cost and benefit of the rejected brine valorization technology from membrane-based technology, that is, electrodialysis (ED), reverse osmosis (RO), and osmotically assisted reverse osmosis (OARO). There are three schemes to be analyzed, named scheme 1 (UF-ED), scheme 2 (UF-NF-UF-RO), and scheme 3 (UF-NF-RO-OARO). The result shows that all the schemes gave a negative net bene?t in each case. The total cost for scheme 2 was lower than another scheme. However, the total benefit for scheme 3 is higher than another scheme. Furthermore, it can be seen that scheme 3 has more economical and environmental benefits than scheme 1 and scheme 2