Economical treatment of reverse osmosis reject of textile industry effluent by electrodialysis-evaporation integrated process

Praneeth, K, Manjunath, D, Bhargava, S, Tardio, J and Sridhar, S 2014, 'Economical treatment of reverse osmosis reject of textile industry effluent by electrodialysis-evaporation integrated process', Desalination, vol. 333, no. 1, pp. 82-91.


Document type: Journal Article
Collection: Journal Articles

Title Economical treatment of reverse osmosis reject of textile industry effluent by electrodialysis-evaporation integrated process
Author(s) Praneeth, K
Manjunath, D
Bhargava, S
Tardio, J
Sridhar, S
Year 2014
Journal name Desalination
Volume number 333
Issue number 1
Start page 82
End page 91
Total pages 10
Publisher Elsevier
Abstract Membrane separation methods such as electrodialysis (ED) can reduce the volume load on evaporators by facilitating further concentration of rejects from reverse osmosis (RO) plants. ED studies were carried out on a bench-scale system using five membrane cell pairs to obtain a textile effluent concentrate containing approximately 6 times the quantity of salts present in the RO reject. The limiting current densities were determined to be in the range 2.15-3.35amp/m2 for feed flow rates varying from 18 to 108L/h. Apart from feed rate, the influence of volume of concentrate and current on membrane performance was evaluated to optimize current utilization. An estimation of energy requirement of an integrated process constituting ED and evaporation for concentration of inorganics present in textile effluent from 4.35% to 24% was made and found to be approximately one eighth of the operating cost incurred by evaporation alone. Detailed design of a commercial ED system revealed that a membrane area of 13.1m2 was required to treat a feed rate of 1500L/h. The payback period to recover capital investment was found to be 110 days.
Subject Water Treatment Processes
Keyword(s) Design
Economic estimation
Electrodialysis
Limiting current density
Textile industry effluent
DOI - identifier 10.1016/j.desal.2013.11.020
Copyright notice © 2013 Elsevier B.V. All rights reserved.
ISSN 0011-9164
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