Performance evaluation of reverse osmosis (RO) pre-treatment technologies for in-land brackish water treatment

Abstract

Integration of renewable energy with desalination technologies has emerged as an attractive solution to augment fresh water supply sustainably. Fouling and scaling are still considered as limiting factors in membrane desalination processes. For brackish water treatment, pre-treatment of reverse osmosis (RO) feed water is a key step in designing RO plants avoiding membrane fouling. This study aims to compare at pilot scale the rejection efficiency of RO membranes with multiple pre-treatment options at different water recoveries (30, 35, 40, 45 and 50%) and TDS concentrations (3500, 4000, and 4500mg/L). Synthetic brackish water was prepared and performance evaluation were carried out using brackish water reverse osmosis (BWRO) membranes (Filmtec LC-LE-4040 and Hydranautics CPA5-LD-4040) preceded by 5 and 1μm cartridge filters, 0.02μm ultra-filtration (UF) membrane, and forward osmosis (FO) membrane using 0.25M NaCl and MgCl2 as draw solutions (DS). It was revealed that FO membrane with 0.25M MgCl2 used as a draw solution (DS) and Ultra-filtration (UF) membrane followed by Filmtec membrane gave overall 98% rejection but UF facing high fouling potential due to high applied pressure. Use of 5 and 1μm cartridge filter prior to Filmtec membrane also showed effective results with 95% salt rejection.

Publication DOI: https://doi.org/10.1016/j.desal.2016.06.030
Divisions: Engineering & Applied Sciences > Mechanical Engineering & Design
Engineering & Applied Sciences > Engineering Systems & Management
Engineering & Applied Sciences > Sustainable environment research group
Engineering & Applied Sciences > Aston Institute of Materials Research (AIMR)
Additional Information: © 2016, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords: Brackish water,forward osmosis,permeate TDS,rejection efficiency,reverse osmosis,ultrafiltration,Chemical Engineering(all),Mechanical Engineering,Chemistry(all),Materials Science(all),Water Science and Technology
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2017-03-16
Published Online Date: 2016-07-15
Accepted Date: 2016-06-28
Submitted Date: 2016-03-01
Authors: Khanzada, N.K.
Khan, S. Jamal
Davies, P.A. ( 0000-0003-4783-1234)

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