Removal of nitrate from water in a novel ion exchange membrane bioreactor

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Biological denitrification in a novel ion exchange membrane reactor (IEMB) has been investigated. The polluted water was separated from the mixed denitrifying culture by a non-porous, mono-anion permselective membrane providing continuous exchange of nitrate for chloride added as a counter-ion to the biocompartment. A removal efficiency of 87% and a surface removal rate of about 1,400 mg NO3-m-2h-1 was achieved at a nitrate concentration of 150 mg NO3-L-1. The treated water stream was essentially free of ethanol, used as a carbon source, and NO2- ions whereas the original water conductivity was completely preserved due to very efficient Donnan exclusion of the cations present in the two solutions from the membrane used. The IEMB process showed higher removal efficiency and better nitrate selectivity compared to a Donnan dialysis process operated under similar conditions.

Original languageEnglish
Pages (from-to)161-167
Number of pages7
JournalWater Science and Technology: Water Supply
Issue number2
Publication statusPublished - 2002
Event2nd World Water Congress of the International Water Association - Berlin, Germany
Duration: 15 Oct 200119 Oct 2001


  • Donnan dialysis
  • Drinking water denitrification
  • Ion exchange membrane bioreactor


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