Electrode erosion during submerged arc treatment of methylene blue water solution

Naum Parkansky, Violetta Yakubov, Isak I. Beilis, Raymond L. Boxman, Olga Berkh

Research output: Contribution to journalArticlepeer-review

Abstract

Low voltage, low energy submerged pulsed arcs with a pulse repetition rate of 100 Hz, energy of 48 mJ and duration of 20 μs were used to determine the electrode erosion rate during treatment of 10 mg l-1 methylene blue (MB) dissolved in 40 ml of deionized water, with and without the addition of 0.5% H2O2. Anode/cathode pairs of Fe/Fe, Ti/Ti, Cu/Cu, Cu/Fe, Fe/Cu, Ti/Fe, Fe/Ti, Cu/Ti and Ti/Cu were used. Smaller cathode erosion was measured, in the solutions without H2O2, with copper cathodes than with other cathodes. Smaller anode erosion in the same conditions was demonstrated by using pairs with a Ti anode than with other anodes and larger erosion was found for Cu anodes. By adding H2O2 to the treated solution, smaller cathode erosion was measured by using pairs with a Ti cathode than with other cathodes and larger rates were measured for Fe cathodes. The largest anode erosion was observed for a Cu anode. The erosion of the anode and cathode depends on material combination of the electrode pairs, i.e. on the thermo physical properties of the electrode materials. The correlations of anode/cathode erosion ratio (Ga/Gc) with ratio (qam/qcm) for various electrode materials were found, where qam and qcm are heat fluxes in the body of the anode and cathode, respectively. The experimental data were fitted by curves described with equation Ga/Gc =A(qa/qc)-b where A and b are experimental constants.

Original languageEnglish
Article number225202
JournalJournal of Physics D: Applied Physics
Volume48
Issue number22
DOIs
StatePublished - 10 Jun 2015

Keywords

  • electrode erosion
  • plasma
  • submerged pulsed arc
  • water treatment

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