title: Electrochemical degradation of a real textile effluent using boron-doped diamond or β-PbO2 as anode.
abstract: Constant current electrolyses are carried out in a filter-press reactor using a boron-doped diamond (Nb/BDD) or a Ti-Pt/β-PbO(2) anode, varying current density (j) and temperature. The degradation of the real textile effluent is followed by its decolorization and chemical oxygen demand (COD) abatement. The effect of adding NaCl (1.5 g L(-1)) on the degradation of the effluent is also investigated. The Nb/BDD anode yields much higher decolorization (attaining the DFZ limit) and COD-abatement rates than the Ti-Pt/β-PbO(2) anode, at any experimental condition. The best conditions are j = 5 mA cm(-2) and 55 °C, for the system's optimized hydrodynamic conditions. The addition of chloride ions significantly increases the decolorization rate; thus a decrease of more than 90% of the effluent relative absorbance is attained using an applied electric charge per unit volume of the electrolyzed effluent (Q(ap)) of only about 2 kA h m(-3). Practically total abatement of the effluent COD is attained with the Nb/BDD anode using a Q(ap) value of only 7 kA h m(-3), with an energy consumption of about 30 kW h m(-3). This result allows to conclude that the Nb/BDD electrode might be an excellent option for the remediation of textile effluents.
authors: Departmento de Química, Universidade Federal de São Carlos, CP 676, 13560-970 São Carlos, SP, Brazil.
authors: José M
authors: JM
authors: Aquino
authors: Gabriel F
authors: GF
authors: Pereira
authors: Romeu C
authors: RC
authors: Rocha-Filho
authors: Nerilso
authors: N
authors: Bocchi
authors: Sonia R
authors: SR
authors: Biaggio
mesh_terms: D001895:Boron / Q000737:chemistry*; D002712:Chlorides / Q000737:chemistry; D018130:Diamond; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D004572:Electrolysis; D005374:Filtration; D007220:Industrial Waste; D007477:Ions; D007854:Lead / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D013696:Temperature; D013784:Textiles; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods
chemical_list: D002712:Chlorides; D007220:Industrial Waste; D007477:Ions; D014874:Water Pollutants, Chemical; D007854:Lead; D018130:Diamond; D001895:Boron; D010100:Oxygen