Oxidation of pharmaceuticals by chlorine dioxide in biologically treated wastewater

G. Hey, R. Grabic, A. Ledin, J. la Cour Jansen, H.R. Andersen

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Abstract

Biologically treated wastewater spiked with a mixture of 56 active pharmaceutical ingredients (APIs) was treated with 0–20mg/L chlorine dioxide (ClO2) solution in laboratory-scale experiments. Wastewater effluents were collected from two wastewater treatment plants in Sweden, one with extended nitrogen removal (low COD) and one without (high COD). About one third of the tested APIs resisted degradation even at the highest ClO2 dose (20mg/L), while others were reduced by more than 90% at the lowest ClO2 level (0.5mg/L). In the low COD effluent, more than half of the APIs were oxidized at 5mg/L ClO2, while in high COD effluent a significant increase in API oxidation was observed after treatment with 8mg/L ClO2. This study illustrates the successful degradation of several APIs during treatment of wastewater effluents with chlorine dioxide.
Original languageEnglish
JournalChemical Engineering Journal
Volume185-186
Pages (from-to)236-242
ISSN1385-8947
DOIs
Publication statusPublished - 2012

Keywords

  • Pharmaceuticals
  • Chlorine dioxide
  • Wastewater effluent

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