Combined photo-Fenton and biological treatment for Diuron and Linuron removal from water containing humic acid

María José Farré, Xavier Doménech, José Peral

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49 Citations (Scopus)

Abstract

A combined chemical (photo-Fenton) and biological treatment has been proposed for Diuron and Linuron degradation in water containing natural dissolved organic matter (DOM). Humic acid (HA) was used to simulate the DOM. During the photo-Fenton process ([Fe(II)] = 15.9 mg L-1, [H2O2] = 202 mg L-1, 60 min of UVA irradiation time), the chemical oxygen demand (COD), total organic carbon (TOC), toxicity (E C5015) and biodegradability (BOD5/COD) of the generated intermediates were assessed. A reduction of photo-Fenton efficiency was observed when HA was present in solution. This effect has been explained as the result of a UVA light screening as well as a OH{radical dot} radical quenching process by the HA. After the photo-Fenton process, the initial toxic and non-biodegradable herbicides were transformed into intermediates suitable for a subsequent aerobic biological treatment that was performed in a sequencing batch reactor (SBR). Complete elimination of the intermediates in presence of HA was reached at the end of the chemical-biological coupled system. Biosorption of HA onto the aerobic biomass was characterized. The results indicate that the Freundlich model adequately describes the adsorption of HA, a phenomena that follows a pseudo second-order adsorption kinetic model. © 2007 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)167-174
JournalJournal of Hazardous Materials
Volume147
Issue number1-2
DOIs
Publication statusPublished - 17 Aug 2007

Keywords

  • Biosorption
  • Herbicides
  • Humic acid
  • Photo-Fenton
  • Sequencing batch reactor

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