The denitrification and neutralization performance of an electrochemically activated biofilm reactor used to treat nitrate-contaminated groundwater

Y. Sakakibara, K. Araki, T. Watanabe, M. Kuroda

Research output: Contribution to journalConference article

40 Citations (Scopus)

Abstract

Continuous denitrification of nitrate-contaminated groundwater containing dissolved oxygen (DO), SO42-, and no buffer was carried out with three identical electrochemically activated biofilm reactors. The reactors consisted primarily of denitrifying biofilm attached to the surface of the cathode, an amorphous carbon employed as the anode, and a DC power supply. In the reactors, denitrification and neutralization caused by H2 and CO2 produced from the cathode and the anode, respectively, occurred simultaneously when an electric current was applied. A complete-mix reactor model coupled with a biofilm-electrode model was developed in conjunction with a limiting-current theory. When the biofilms were sufficiently acclimated and adapted to the electric current, the denitrification performance calculated using the model was in fairly good agreement with experimental results.

Original languageEnglish
Pages (from-to)61-68
Number of pages8
JournalWater Science and Technology
Volume36
Issue number1
DOIs
Publication statusPublished - 1997 Oct 21
EventProceedings of the 1996 IAWQ 3rd International Specialised Conference on Biofilm Systems - Copenhagen, Den
Duration: 1996 Aug 271996 Aug 30

Keywords

  • Biofilm model
  • Biofilm-electrode system
  • Denitrification
  • Drinking water
  • Electric current
  • Ground water
  • Hydrogen
  • Neutralization
  • Nitrate
  • Reactor model

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

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