Effect of inorganic ions on the solar detoxification of water polluted with pesticides.
The effect of eleven inorganic ions (Cl(-), NO(3)(-), SO(4)(2-); PO(4)(3-), Na(+); NH(4)(+), Ca(2+), Mg(2+), Zn(2+), Cu(2+) and Al(3+)) on the photo-Fenton elimination of pesticides has been investigated. Phosphate and chloride have been demonstrated to have an inhibitory role; on the other hand, the reaction was accelerated in the presence of Cu(2+), most probably due to a copper-driven Fenton-like process. The solar photo-Fenton treatment of a mixture of four commercial pesticides was studied at pilot plant scale in the presence of chlorides. Samples with coincident dissolved organic carbon (DOC) showed similar chemical composition, which resulted in a comparable biocompatibility, however longer irradiation periods were needed to reach the desired mineralization when Cl(-) was present. It was demonstrated that the chemical process was able to improve significantly the biocompatibility of the effluent, as shown by the inhibition of respiration of activated sludge, BOD/COD ratio and Zahn-Wellens test.
Soler
J
J
Grupo de Procesos de Oxidación Avanzada, Departamento de Ingeniería Textil y Papelera, Universidad Politécnica de Valencia, Campus de Alcoy, Plaza Ferrandiz y Carbonell s/n, Alcoy, Spain.
García-Ripoll
A
A
Hayek
N
N
Miró
P
P
Vicente
R
R
Arques
A
A
Amat
A M
AM
D002384:Catalysis / Q000528:radiation effects; D002712:Chlorides / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000737:chemistry*; D007700:Kinetics; D009566:Nitrates / Q000737:chemistry; D010084:Oxidation-Reduction / Q000528:radiation effects; D010575:Pesticides / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D012964:Sodium / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry; D013472:Sunlight; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
D002712:Chlorides; D007477:Ions; D009566:Nitrates; D010575:Pesticides; D010710:Phosphates; D000644:Quaternary Ammonium Compounds; D013431:Sulfates; D014874:Water Pollutants, Chemical; D012964:Sodium