Anodic,cathodic and combined treatments for the electrochemical oxidation of an effluent from the flame retardant industry |
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Authors: | Daniele Montanaro Elisabetta Petrucci Carlo Merli |
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Affiliation: | (1) Department of Chemical Engineering Materials & Environment, “Sapienza” University of Rome, Via Eudossiana 18, 00184 Rome, Italy |
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Abstract: | The electrochemical oxidation of an effluent from the manufacture of phosphorus based flame retardants was studied. To reach
a residual concentration of reduced phosphorus lower than 10 mg L−1, in compliance with Italian law for industrial wastewater disposal, anodic oxidation using a boron-doped diamond (BDD) anode
and electro-Fenton (EF) treatment were tested. The effects of some factors are optimised and a comparison of the reaction
pathways is also presented. A combined treatment using EF with BDD conducted in an undivided cell is shown not to enhance
the data obtained with BDD while a novel combined treatment using EF and BDD in a divided cell shows promising results when
an anionic membrane is used as separation. In this last case the cell operates as two different batch reactors working with
the same current. The anodic compartment, fed with raw effluent, provides partial oxidation, while the cathodic compartment,
fed with the partially anodically oxidised solution, completes the treatment. When the effluent is transferred in the cathodic
compartment, the anodic one is fed with fresh untreated solution. The advantage of this kind of coupling consists in the simultaneity
of the two treatments which allows total oxidation with notable saving of charge and time. |
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Keywords: | Electro-Fenton Boron-doped diamond electrode Hydroxyl radical Combined treatment Phosphorus compounds Flame retardants |
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