Pilot studies on high recovery BWRO-EDR for near zero liquid discharge approach

A hybrid process combining reverse osmosis and electrodialysis has been shown to be effective in recovering 97–98% of brackish water as product water with chloride levels of 200 mg/L or less. Potential for scaling on the brine side of the electrodialysis unit was prevented by acidification, operatin...

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Bibliographic Details
Published in:Desalination 2010-10, Vol.261 (3), p.321-330
Main Authors: Oren, Y., Korngold, E., Daltrophe, N., Messalem, R., Volkman, Y., Aronov, L., Weismann, M., Bouriakov, N., Glueckstern, P., Gilron, J.
Format: Article
Language:English
Subjects:
Applied sciences
Brackish
Brackish water
BWRO
Chemical engineering
Chlorides
Desalination
Drinking water and swimming-pool water. Desalination
Economics
EDR
Electrodialysis
Exact sciences and technology
Freshwater
Groundwaters
Inland desalination
Magnesium
Membrane separation (reverse osmosis, dialysis...)
Natural water pollution
Near ZLD
Pollution
Recovering
Salt water
Settlers
Water treatment and pollution
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Summary:A hybrid process combining reverse osmosis and electrodialysis has been shown to be effective in recovering 97–98% of brackish water as product water with chloride levels of 200 mg/L or less. Potential for scaling on the brine side of the electrodialysis unit was prevented by acidification, operating the electrodialysis in a reversal mode (EDR), and a side loop crystallizer which prevented buildup of scaling components. Settlers, inline microfiltration, and side-loop ultrafiltration kept suspended solids from returning to the EDR unit. This process was demonstrated in a series of more than eighty batch experiments of 1.5 to 1.8 m 3 of RO concentrate of raw brackish groundwater from the Negev Highland, Israel. Each batch could be processed within a single day. The feed-water was concentrated from 0.3% to over 10% TDS super-concentrate while producing the water that could be recycled to the RO permeate. This super-concentrate from the EDR unit was further concentrated in a wind powered WAIV unit that brought final brine TDS to > 30%, and showed promise as a method to recover mineral byproducts such as magnesium salt. Initial economic estimates show that this hybrid process is competitive with conventional RO and other enhanced recovery processes for inland desalination requiring use of evaporation ponds .
ISSN:0011-9164
1873-4464
DOI:10.1016/j.desal.2010.06.010