Coupled solar photo-Fenton and biological treatment for the degradation of diuron and linuron herbicides at pilot scale.
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.
Farré
Maria José
MJ
Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
Maldonado
Manuel Ignacio
MI
Gernjak
Wolfgang
W
Oller
Isabel
I
Malato
Sixto
S
Domènech
Xavier
X
Peral
José
J
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
C045076:Fenton's reagent; D006540:Herbicides; D008044:Linuron; D004237:Diuron; D006861:Hydrogen Peroxide; D007501:Iron