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Title: RO concentrate treatment by a hybrid system consisting of a pellet reactor and electrodialysis
Authors: Tran, Thi Kim Anh ×
Zhang, Yang
Jullok, Nora
Meesschaert, Boudewijn
Pinoy, Luc
Van der Bruggen, Bart #
Issue Date: 10-Sep-2012
Publisher: Elsevier
Series Title: Chemical Engineering Science vol:79 pages:228-238
Abstract: This paper investigates the feasibility of a hybrid system consisting of a pellet reactor and electrodialysis
(ED) to treat reverse osmosis (RO) concentrates in which the pellet reactor was used to remove
the scaling potential before ED treatment. The objective of the hybrid system was a high recovery for
the RO system, and zero liquid discharge for the RO. The performance of the pellet reactor on lab-scale
was evaluated at superficial velocities of 48, 61 and 73 m/h with an initial pH 11. The efficiency of
calcium removal was between 70 and 80%. Precipitation in the pellet reactor showed higher calcium
removal up to 95% when the pH was adjusted to 11.5. The wastewater with reduced scaling potential
(after pellet crystallization) was treated by ED to achieve the required characteristics for reinserting the
liquid to an integrated system ultrafitration–reverse osmosis (UF–RO). Without the pellet reactor and
using RO concentrate as feed of ED in feed and bleed operation, the ED was rapidly scaled and reached
the maximum voltage. By removing 80% calcium in RO concentrate in the pellet reactor, the ED system
can be operated in a stable way with high current efficiency and without scaling.
ISSN: 0009-2509
Publication status: published
KU Leuven publication type: IT
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
× corresponding author
# (joint) last author

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