Effects of nitrate on the UV photolysis of H2O2 for 2,4-dichlorophenol degradation in treated effluents

K. B. Ko, J. Y. Lee, Y. H. Yoon, T. H. Moon, Y. H. Ahn, C. G. Park, K. S. Min, J. H. Park

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The major objective of this study was to delineate the effect of nitrate on the UV oxidation of 2,4-DCP by conducting a bench-scale operation at various reaction times, and initial concentrations of H2O2 and NO-3. 2,4-DCP (20±5 μg/L) was oxidized in very limited amounts through direct UV photolysis, without additional oxidation by hydroxyl radicals. However, it was completely oxidized with an initial H2O2 concentration of 20 mg/L at a reaction time of 1.0 min under the operating conditions described below. The practical reaction time for 80% oxidation turned out to be 2.0 min (with a high UV dose) with an initial H2O2 concentration of 10 mg/L. Nitrate enhanced the 2,4-DCP oxidation by the hydroxyl radicals produced from nitrate photolysis with the relatively low initial H2O2 concentrations of 0.0 to 5 mg/L, but hindered the oxidation, when an initial H2O2 concentration in the reactor was less than or around about 10 mg/L. The adverse effect of nitrate on the 2,4-DCP oxidation was not observed with a relatively high initial H2O2 concentration of 20 mg/L at the reaction times of 1.0 to 2.0 min. The scavenging effect of nitrate on the 2,4-DCP oxidation was generally limited with the concentration ranges tested in this study.

Original languageEnglish
Pages (from-to)6-11
Number of pages6
JournalDesalination and Water Treatment
Volume2
Issue number1-3
DOIs
Publication statusPublished - 2009 Feb

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Ocean Engineering
  • Pollution

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