Decomposition of ethylenediaminetetraacetic acid by supercritical water oxidation

Hyeon Cheol Lee, Jung Hyun In, Kyung Yub Hwang, Chang-Ha Lee

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Abstract

Ethylenediaminetetraacetic acid (EDTA) was decomposed by supercritical water oxidation (SCWO) in a tubular plug-flow reactor. The effect of the oxidant amount on the decomposition rate and efficiency was more significant at lower temperature. Also, excess oxidant played a key role in decreasing the activation energy for EDTA decomposition as CODCr. The nitrogen from EDTA was found to transform into NO3 --N by thermal decomposition, while a portion of the nitrogen of EDTA and NO3 --N was transformed into NH4 +-N and finally converted to N 2 gas in the SCWO process. The decomposition kinetics of EDTA as CODCr in the SCWO process was described by a global rate expression.

Original languageEnglish
Pages (from-to)3223-3227
Number of pages5
JournalIndustrial and Engineering Chemistry Research
Volume43
Issue number13
Publication statusPublished - 2004 Jun 23

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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