A novel multi-electrode system for electrolytic and biological water treatments: Electric charge transfer and application to denitrification

Y. Sakakibara, T. Nakayama

Research output: Contribution to journalArticle

84 Citations (Scopus)

Abstract

A novel multi-electrode system is proposed for electrolytic and biological water treatments. The multi-electrode system is comprised of multiple working electrodes and their counter electrode, where electric current or potential applied to each electrode is controlled independently. Experimental result for different electrolyte solutions showed that electric charge in the system was efficiently carried by dissociative electrolytes such as carbonate ions. This transfer mechanism is regarded as being effective both in keeping pH level around neutrality and in passing certain amounts of electric current especially in dilute solutions such as groundwater and surface water. A long-term (over 500 days) experiment also showed the enhanced and stable denitrification performance of biofilm-electrode reactor (BER) equipped with the multi-electrode system, comparing to former BERs. This superior performance was thought to be attributable to large effective surface area of electrode, the charge transfer mechanism by dissociative electrolyte, and the formation of highly reducing (or oxidizing) zones. From these results, we conclude that the multi-electrode system is useful for electrolytic and biological treatments of groundwater and surface water.

Original languageEnglish
Article number2956
Pages (from-to)768-778
Number of pages11
JournalWater Research
Volume35
Issue number3
DOIs
Publication statusPublished - 2001 Jan 1
Externally publishedYes

Keywords

  • Biofilm-electrode reactor (BER)
  • Denitrification
  • Groundwater
  • Hydrogen
  • Multi-electrode system
  • Oxygen

ASJC Scopus subject areas

  • Ecological Modelling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

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