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A comparative study between stirred dead end and circular flow in microfiltration of china clay suspension

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posted on 17.11.2015, 09:49 by Norazanita Shamsuddin, Chengcheng Cao, Victor Starov, Diganta DasDiganta Das
A well-defined comparative study between stirred dead end and circular crossflow for microfiltration of china clay suspension has been undertaken. The comparisons have been made with respect to convective mass transfer coefficients, permeation and rejection rates, and energy consumption. Similar operating and hydrodynamic conditions were implemented for the comparison. According to our experimental data circular crossflow module was proven to perform better as compared with the stirred dead end system due to the higher mass transfer coefficients, higher permeation rates and lower energy consumption. The mass transfer coefficients observed are comparable to previously found in vortex flow filtration and dead end flow filtration. The presence of Dean vortices in circular crossflow module promotes flow instabilities in the curved channel flow path which reduce concentration polarization effect during the filtration process. The concentration polarization effect however deteriorated due to solute build up (high solute concentration at the membrane surface) and decrease of the shear stress, i.e., the particle lift forces on the membrane surface. This resulted in deposition of particles on the membrane surface. In terms of energy consumption, for the same energy cost the limiting flux reached in circular crossflow is found higher than in stirred dead end unit

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

Water Science and Technology

Citation

SHAMSUDDIN, N. ...et al., 2016. A comparative study between stirred dead end and circular flow in microfiltration of china clay suspension. Water Science and Technology: Water Supply 16(2), pp.481-492.

Publisher

IWA Publishing

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2016

Notes

This paper was accepted for publication in the journal Water Science and Technology: Water Supply and the definitive published version is available at http://dx.doi.org/10.2166/ws.2015.158

ISSN

0273-1223

Language

en