DESIGN OF ELECTRO DIALYSIS SETUP FOR CONCENTRATING EFFLUENTS
Vamsi Prasad Rao Jamalapuram*
University of Tulsa
2646 East 6th Street, Apt #7,
Tulsa, OK 74104
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E-mail: vamsi-jamalapuram@utulsa.edu
Membrane methods of separation such as electro dialysis can reduce the volume load on evaporators by facilitating further concentration of rejects from evaporators, reverse osmosis plants. Electro dialysis studies were carried out on a bench-scale system using five membrane cell pairs with an example of textile effluent to obtain a concentrate containing approximately 4 times the quantity of salts present in the RO reject. The limiting current densities were determined for different feed flow rates. Influence of feed flow rate volume of concentrate and current on membrane performance was evaluated. The effect of energy requirement for concentration in organics present in the effluent from 3% to 24% was made and compared with evaporation costs. Detailed design of a commercial electro dialysis system in terms of membrane area requirement was carried out for a feed rate of 1.5 M