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1 Polish Journal of Chemical Technology

1 2003

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Water treatment using the new concept of ion exchange membrane bioreactor

Velizarov S., Reis M. A., Crespo J. G.

Polish Journal of Chemical Technology

2003

Vol. 5, nr 2

40-43

The ion exchange membrane bioreactor (IEMB) is a new concept for treating water, contaminated with inorganic charged pollutants, which uses a non-porous ion exchange membrane as a barrier between the water stream and a biocompartment. A suitable driving counter-ion is added to the biocompartment, providing the coupled counter-diffusion of the target contaminating ion, where the latter undergoes and a biodegradation (biotransfor-mation) to harmless product(s) by a mixed microbial culture. Transport of co-ions through the membrane is negligible due to their electrostatic repulsation (Donnan exclusion) from the similarly charged membrane surface. A case study based on nitrate as the target pollutant and chloride as the driving counter-ion is presented in order to show the potential of the IEMB process for drinking water denitrification. The effects of the most important process variables on the flux and removal were studied. The biofilm developing on the membrane surface, contacting the IEMB biocompartment, was found to serve as a reactive barrier for carbon source penetration into the treated water.