Osmotically assisted reverse osmosis for high salinity brine treatment
- Carnegie Mellon Univ., Pittsburgh, PA (United States). Department of Civil and Environmental Engineering; National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
- Carnegie Mellon Univ., Pittsburgh, PA (United States). Department of Civil and Environmental Engineering
- National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
- Carnegie Mellon Univ., Pittsburgh, PA (United States). Department of Civil and Environmental Engineering and Department of Engineering and Public Policy
Here, this work evaluates a novel osmotically assisted reverse osmosis (OARO) process for dewatering high salinity brines using readily available membranes and equipment. While traditional reverse osmosis processes are limited to treating brines with osmotic pressures below the membrane burst pressure, in OARO, the osmotic pressure difference across a membrane is reduced with a permeate side saline sweep. A series of OARO stages can be used to sequentially reduce the concentration of the feed until a traditional RO process can obtain fully desalinated water. This paper develops an OARO model to identify feasible operating conditions for this process and to estimate the water recovery and energy consumption across a range of brine feed concentrations. For a feed of 100–140 g/L sodium chloride, we estimate that the OARO process is capable of a 35–50% water recovery with an energy consumption of 6–19 kWh per m3 of product water. Finally, the results suggest that an OARO dewatering process improves upon the recovery of reverse osmosis for high salinity brines and has a comparable or lower energy consumption than mechanical vapor compression.
- Research Organization:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE); USDOE Office of Fossil Energy and Carbon Management (FECM)
- Grant/Contract Number:
- CBET-1554117; CBET-1215845
- OSTI ID:
- 1479651
- Alternate ID(s):
- OSTI ID: 1550527
- Journal Information:
- Desalination, Vol. 421, Issue C; ISSN 0011-9164
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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journal | July 2019 |
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