Coupled solar photo-Fenton and biological treatment for the degradation of diuron and linuron herbicides at pilot scale

Maria José Farré, Manuel Ignacio Maldonado, Wolfgang Gernjak, Isabel Oller, Sixto Malato, Xavier Domènech, José Peral

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39 Citations (Scopus)

Abstract

A coupled solar photo-Fenton (chemical) and biological treatment has been used to remove biorecalcitrant diuron (42 mg l-1) and linuron (75 mg l-1) herbicides from water at pilot plant scale. The chemical process has been carried out in a 82 l solar pilot plant made up by four compound parabolic collector units, and it was followed by a biological treatment performed in a 40 l sequencing batch reactor. Two Fe(II) doses (2 and 5 mg l-1) and sequential additions of H2O2 (20 mg l-1) have been used to chemically degrade the initially polluted effluent. Next, biodegradability at different oxidation states has been assessed by means of BOD/COD ratio. A reagent dose of Fe = 5 mg l-1 and H2O2 = 100 mg l-1 has been required to obtain a biodegradable effluent after 100 min of irradiation time. Finally, the organic content of the photo-treated solution has been completely assimilated by a biomass consortium in the sequencing batch reactor using a total suspended solids concentration of 0.2 g l-1 and a hydraulic retention time of 24 h. Comparison between the data obtained at pilot plant scale (specially the one corresponding to the chemical step) and previously published data from a similar system performing at laboratory scale, has been carried out. © 2008 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)622-629
JournalChemosphere
Volume72
Issue number4
DOIs
Publication statusPublished - 1 Jun 2008

Keywords

  • Biodegradability
  • Herbicide
  • Photo-Fenton
  • Pilot plant scale
  • Sequencing batch reactor

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