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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/5455
Title: A hybrid ion exchange-nanofiltration (HIX-NF) process for energy efficient desalination of brackish/seawater
Authors: Sarkar S.
SenGupta A.K.
Published in: Water Science and Technology: Water Supply
Abstract: This study reports a new hybrid ion exchange-nanofiltration (HIX-NF) process for desalination of sea and brackish water that can attain significant energy economy over the conventional membrane-based pressure driven processes. In this hybrid process, an ion exchange step converts monovalent chloride ions of saline water to divalent sulfate ions and the resulting solution, having a reduced osmotic pressure than the feed, is desalinated using a nanofiltration (NF) membrane. The sulfate rich reject stream from the NF process is used to regenerate the anion exchanger. Results validate that NF membranes can desalinate sodium sulfate solution at a much lower transmembrane pressure compared to RO membranes as well as yield a higher permeate flux. The sulfate-chloride selectivity of the anion exchangers plays important role in sustainability of the process. Laboratory studies have revealed that a single type of anion exchanger cannot sustain the process for saline water with different salt concentrations. However, anion exchangers with different sizes of amine functional groups (e.g. quaternary-, tertiary-, secondary- and primary amine) hold the promise that the process can be tailored to achieve sustainability. Laboratory studies have validated the basic premise of the hybrid process including greater than two times less energy requirement than RO process for the same feed water and same permeate recovery condition. ¬© IWA Publishing 2009.
Citation: Water Science and Technology: Water Supply(2009), 9(4): 369-377
URI: https://doi.org/10.2166/ws.2009.634
http://repository.iitr.ac.in/handle/123456789/5455
Issue Date: 2009
Publisher: IWA Publishing
Keywords: Brackish water
Desalination
Hybrid ion exchange
Nanofiltration
Sea water
Sulfate-chloride ion exchange
ISSN: 16069749
Author Scopus IDs: 57201440577
56820929400
Author Affiliations: Sarkar, S., Department of Civil and Environmental Engineering, Lehigh University, Fritz Engineering Laboratory, 13 E Packer Avenue, Bethlehem, PA 18015, United States
SenGupta, A.K., Department of Civil and Environmental Engineering, Lehigh University, F
Corresponding Author: Sarkar, S.; Department of Civil and Environmental Engineering, Lehigh University, Fritz Engineering Laboratory, 13 E Packer Avenue, Bethlehem, PA 18015, United States; email: sus9@lehigh.edu
Appears in Collections:Journal Publications [CE]

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