Arsenite oxidation by Alcaligenes faecalis strain O1201

Arthon Suttigarn, Yi Tin Wang

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


Batch experiments were conducted to examine the oxidation of arsenite (As (III)) to arsenate (As (V)) by Alcaligenes faecalis strain O1201 isolated from soils. Pure cultures of O1201 completely oxidized As (III) to As (V) in the exponential growth phase at As (III) concentrations ranging from 10 to 1,000 mg/L in less than 12 h. The growth of O1201 requires an organic substrate as the carbon and energy source, and the oxidation of As (III) was mainly observed in the exponential growth phase. As (III) concentration at 500 mg/L inhibited the growth of O1201, whereas its oxidation product As (V) did not show any inhibition effects even at concentration as high as 1,000 mg/L. Kinetics studies of As (III) oxidation were performed under the optimal conditions for O1201 at pH 7 and 30°C in a chemical defined medium with citrate as the sole carbon source. The Monod expression coupled with a logistic growth model was used to analyze the kinetics of As (III) oxidation. The best fit parameters of half-velocity coefficient Kc, of 15 mg/L, maximum reaction rate coefficient kmc of 0.47 mg As (III)/mg dry weight/h, and logistic growth rate coefficient r of 0.22-0.34 h-1 were obtained using a nonlinear regression analysis. Journal of Environmental Engineering

Original languageEnglish
Pages (from-to)1293-1301
Number of pages9
JournalJournal of Environmental Engineering
Issue number9
StatePublished - Sep 2005


  • Arsenic
  • Oxidation
  • Parameters
  • Toxicity

ASJC Scopus subject areas

  • General Environmental Science
  • Environmental Engineering
  • Environmental Chemistry
  • Civil and Structural Engineering


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