| Title | Brine recovery: achieving high magnesium concentration using selective nanofiltration membranes |
|---|---|
| ID_Doc | 14697 |
| Authors | Gilabert-Oriol, G; Arias, D; Niewersch, C; Maciá, MAP; Alomar, H |
| Title | Brine recovery: achieving high magnesium concentration using selective nanofiltration membranes |
| Year | 2023 |
| Published | |
| Abstract | Seawater brine recovery is a promising technology to recover valuable compounds out of seawater reverse osmosis brine and produce drinking water from seawater. Brine recovery enables the recuperation of natural resources from seawater through a sustainable process aligned with United Nations sustainability development goals and the transition into a circular economy. To get these compounds, different steps need to be performed. The first one involves separating divalent compounds from monovalent ones. This is achieved using selective nanofiltration membranes. The subsequent phase of the process requires the production of potable water, followed by the concentration and dewatering of the residual monovalent brine. FilmTec (TM) SWBR-100 and FilmTec (TM) SWBR-150 are two types of nanofiltration selective membranes explicitly designed to segregate divalent and monovalent compounds. This allows the isolated divalent compounds to be recovered as valuable magnesium salts, following further concentration. At a later stage in the process, the monovalent permeate stream produced by FilmTec (TM) SWBR-100 or FilmTec (TM) SWBR-150 undergoes additional concentra-tion enhancement with the aid of FilmTec (TM) SWBR-200. This membrane enables the recovery of Na and Cl monovalents, even when dealing with high total dissolved solids. This research study aims to evaluate the functionality of these three membranes and highlights the benefits that nanofiltration and seawater reverse osmosis elements bring to the separation process. The membranes were tested under typical operating conditions of a brine recovery process. The experimentation was conducted at the Global Water Technology Center in Tarragona. The trials showed that FilmTec (TM) SWBR-100 delivers the highest divalent rejection rate while FilmTec (TM) SWBR-150 performs well and saves some energy. Moreover, experimentation demonstrated that FilmTec (TM) SWBR-200 provides satisfactory monovalent concentration levels with lower energy consumption. |
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