Degradation of atrazine by modified stepwise-Fenton's processes

Wei Chu, K. H. Chan, C. Y. Kwan, K. Y. Choi

Research output: Journal article publicationJournal articleAcademic researchpeer-review

60 Citations (Scopus)

Abstract

The removal of atrazine (ATZ) by stepwise Fenton's processes (stepwise-FP) was studied and the system models were developed through the examination of reaction kinetics. The study compared the performance of the removal of ATZ by conventional FP with stepwise-FP, where the total dose of H2O2was split and inputted into the system at different times and/or quantities. The performance of stepwise-FP was found to be better than that of conventional FP. This was probably due to the minimization of the peak concentration of H2O2in the solution, which reduced the probability that valuable H2O2and hydroxyl radicals would be consumed in forming weaker radicals. The reaction kinetics of the decay of ATZ in stepwise-FP was found to be a two-stage process; and in each stage, fast decay followed by stagnant decay was observed. Two characterized constants (the initial decay rate and the oxidative capacity) were introduced and were found to be useful in quantifying the stepwise-FP. The models for predicting stepwise-FP with respect to different dosing times and/or asymmetrical doses were developed, and were found to be very useful for evaluating the system performance and/or for process design.
Original languageEnglish
Pages (from-to)755-761
Number of pages7
JournalChemosphere
Volume67
Issue number4
DOIs
Publication statusPublished - 1 Mar 2007

Keywords

  • Atrazine
  • Fenton
  • H O 2 2
  • Kinetic model
  • Stepwise dosage

ASJC Scopus subject areas

  • Environmental Chemistry
  • Environmental Science(all)

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