Reverse Osmosis Separation of NaCl using a Bentonite Membrane

Abstract

The results of 11 experiments using compacted bentonite membranes in a cross-flow experimental cell equipped with a piston to maintain clay membrane compaction are reported. Due to dispersion in the porous frit, solute concentration buildup adjacent to the membrane was not a problem at the flow rates used in these experiments (6 to 126 mL/hr). The solute rejection efficiency of the bentonite membrane decreased with increasing solution concentration. The rejection efficiency for the 0.5-mm thick membrane ranged from 68% of Cl- for 100-mM (3545 ppm) NaCl solution to 13% of Cl - for 2300-mM (81,542 ppm) NaCl solution. The membrane exhibited stable solute rejection.

Department(s)

Geosciences and Geological and Petroleum Engineering

Keywords and Phrases

Brine; Clay; Membrane; Reverse Osmosis; Compaction; Sodium Chloride; Solute Rejection; Separation; Chloride

International Standard Serial Number (ISSN)

0149-6395

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2003 Taylor & Francis, All rights reserved.

Publication Date

01 Jan 2003

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