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Title: Pilot Scale Study on Salt Removal by Electrodialysis from RO Concentrate with High Scaling Potential
Authors: Meesschaert, Boudewijn
Zhang, Yang
Ghyselbrecht, Karel
Pinoy, Luc
Van der Bruggen, Bart #
Issue Date: 19-Sep-2010
Conference: IWA World Water Congress and Exhibition 2010 location:Montréal, Canada date:19-24 September, 2010
Abstract: This paper presents a pilot scale investigation for salt removal by electrodialysis on the Reverse Osmosis (RO)
concentrate of the IWVA that is obtained by RO treatment of the effluent of a WWTP. Due to the presence of a
high concentration of carbonates (around 1300-1600 ppm as carbonates) the RO concentrate has a high scaling
potential and a decarbonation process based on an acidification with HCl and an aeration was installed. In this
study, it is proved that the ED system can run a long-term operation on the decarbonated RO-concentrate to
produce the designed effluent (around 75% salt removal) without scaling problems. Meanwhile, a high overall
water recovery (95%) was achieved for the integrated RO-ED system. Furthermore an economical analysis of
the ED system was carried out to evaluate the feasibility of this process. Result shows that the full operational
cost is around 0.66 Euro/m3 RO-concentrate treated by the ED system; the total cost of the RO-filtrate is thus
enhanced with 0.22 Euro/m3.
Publication status: published
KU Leuven publication type: IC
Appears in Collections:Process Engineering for Sustainable Systems Section
Microbial and Molecular Systems - miscellaneous
Sustainable Chemical Process Technology TC, Technology Campuses Ghent and Aalst
Sustainable Chemical Process Technology TC
Technologiecluster Bioengineering Technologie
Bioengineering Technology TC, Technology Campus Ostend
# (joint) last author

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