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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/24706
Title: Modelling of electrodialytic removal of multiple ions from synthetic solution
Authors: Dattatreya J.G.
Jain S.
Kumar N.
Chattopadhyay, Sujay
Bhattacharya P.K.
Ray A.K.
Published in: AIChE Annual Meeting, Conference Proceedings
2012 AIChE Annual Meeting, AIChE 2012
Abstract: Drinking water is slowly becoming a very precious commodity with rapid urbanization of world. Uncontrolled pollution in every aspect of mother earth (water, soil, environment and air) is posing challenge to flora and fauna. Days are not very far when we will have no ground water available for drinking purposes. Therefore, means to recycle used water through low cost technology needs to be devised. Commercial waste water treatment reduces BOD/COD and provides water that can be drained in channels and rivers. To make this water drinkable we need to critically analyze its contents and pass it through adsorption bed, membrane module and UV treatment. Electrodialysis (ED) is claimed to be more energy economic process compared to conventional reverse osmosis and ultra filtration. Factors governing electrodialysis process are (i) Membrane, (ii) type of ions, (iii) medium and (iv) potential applied. For a given ion, the efficiency of separation depends on membrane type (surface charge, porosity, resistance etc.). The rate of adsorption, diffusion, desorption of ions from one side to the other decides the resistance to ion transport. Current density was estimated theoretically for a known concentration and flow and the behavior was noted for batch recirculation electrodialysis. The cell was operated below limiting current density (lcd). A linear concentration profile (with increase in current density) was assumed between the bulk to membrane surface while the concentration at membrane surface was obtained from 'limiting current density'. This value approaches zero while the current density approaches limiting value. Process parameters (flow, voltage and concentration) influencing removal efficiency of Na+, Mg 2+, Cl-1, SO4-2 ions were estimated. Limiting current density and current densities of solutions containing multi ions were estimated using the model. The limiting current density of the process was estimated theoretically using Nernst-Planck equation [1and2] and found to decrease with time which supports experimental findings. Diffusivity and mass transfer coefficients were calculated [4and5] and found to match well with literature [3]. The proposed model can be used (within the range specified here) for estimation and design of an electrodialysis stack to achieve a desired output.
Citation: AIChE Annual Meeting, Conference Proceedings (2012)
URI: http://repository.iitr.ac.in/handle/123456789/24706
Issue Date: 2012
Keywords: Current density
Electrodialysis
Limiting current density
Mass transfer coefficient
ISBN: 9.78082E+12
Author Scopus IDs: 39361227700
56429813200
57224558972
7403001849
7202370354
34768855100
Author Affiliations: Dattatreya, J.G., Department of Paper Technology, I.I.T.Roorkee, Saharanpur Campus, India
Jain, S., Department of Paper Technology, I.I.T.Roorkee, Saharanpur Campus, India
Kumar, N., Department of Paper Technology, I.I.T.Roorkee, Saharanpur Campus, India
Chattopadhyay, S., Department of Paper Technology, I.I.T.Roorkee, Saharanpur Campus, India
Bhattacharya, P.K., Department of Chemical Engineering, I.I.T.Kanpur, India
Ray, A.K., Department of Paper Technology, I.I.T.Roorkee, Saharanpur Campus, India
Corresponding Author: Dattatreya, J.G.; Department of Paper Technology, India; email: dattut@gmail.com
Appears in Collections:Conference Publications [PE]

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