Arsenic removal by advanced electrocoagulation processes: The role of oxidants generated and kinetic modeling

Micah Flor V. Montefalcon, Meliton R. Chiong, Augustus C. Resurreccion, Sergi Garcia-Segura, Joey D. Ocon

Research output: Contribution to journalArticlepeer-review

Abstract

Arsenic (As) is a naturally occurring element in the environment that poses significant risks to human health. Several treatment technologies have been successfully used in the treatment of As-contaminated waters. However, limited literature has explored advanced electrocoagulation (EC) processes for As removal. The present study evaluates the As removal performance of electrocoagulation, electrochemical peroxidation (ECP), and photo-assisted electrochemical peroxidation (PECP) technologies at circumneutral pH using electroactive iron electrodes. The influence of As speciation and the role of oxidants in As removal were investigated. We have identified the ECP process to be a promising alternative for the conventional EC with around 4-fold increase in arsenic removal capacity at a competitive cost of 0.0060 $/m3. Results also indicated that the rate of As(III) oxidation at the outset of electrochemical treatment dictates the extent of As removal. Both ECP and PECP processes reached greater than 96% As(III) conversion at 1 C/L and achieved 86% and 96% As removal at 5 C/L, respectively. Finally, the mechanism of As(III) oxidation was evaluated, and results showed that Fe(IV) is the intermediate oxidant generated in advanced EC processes, and the contribution of OH brought by UV irradiation is insignificant.

Original languageEnglish (US)
Article number928
Pages (from-to)1-16
Number of pages16
JournalCatalysts
Volume10
Issue number8
DOIs
StatePublished - Aug 2020

Keywords

  • Arsenite and arsenate removal
  • Electrochemical peroxidation
  • Fentonlike processes
  • Peroxicoagulation
  • Photo-assisted processes

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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