title: Coupled solar photo-Fenton and biological treatment for the degradation of diuron and linuron herbicides at pilot scale.
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 24h. 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.
authors.affiliation: Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
authors.forename: Maria José
authors.initials: MJ
authors.lastname: Farré
authors.forename: Manuel Ignacio
authors.initials: MI
authors.lastname: Maldonado
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Gernjak
authors.forename: Isabel
authors.initials: I
authors.lastname: Oller
authors.forename: Sixto
authors.initials: S
authors.lastname: Malato
authors.forename: Xavier
authors.initials: X
authors.lastname: Domènech
authors.forename: José
authors.initials: J
authors.lastname: Peral
mesh_terms: D001673:Biodegradation, Environmental; D019149:Bioreactors; D004237:Diuron / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D006540:Herbicides / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D007753:Laboratories; D008044:Linuron / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D010084:Oxidation-Reduction; D010777:Photochemistry; D010865:Pilot Projects; D013472:Sunlight
chemical_list: C045076:Fenton's reagent; D006540:Herbicides; D008044:Linuron; D004237:Diuron; D006861:Hydrogen Peroxide; D007501:Iron