title: Selective electrochemical degradation of 4-chlorophenol at a Ti/RuO2-IrO2anode in chloride rich wastewater.
abstract: The electrochemical degradation of 4-chlorophenol (4-CP) in the presence of chlorides by the use of a Ti/RuO2-IrO2anode was investigated under different operational parameters such as applied current density (J) and chloride concentration ([NaCl]). By performing a design of experiments, a model for the removal of 4-chlorophenol under these circumstances was obtained. To investigate matrix effects for this oxidation process, the influence of various biodegradable substrates (such as glucose, a complex synthetic wastewater and a pilot-scale UASB effluent) on the degradation profile of 4-chlorophenol was investigated. The 4-CP degradation was hardly affected by the presence of glucose, which was itself only limitedly degraded (max. 5%). This indicates a selective degradation for the phenolic compound, independent of the values of the operational parameters. The presence of a more complex synthetic wastewater, however, resulted in a decrease in 4-CP degradation rate up to a factor 7. The biodegradable substrates are in this case also degraded by the electrochemical treatment. In the case where 4-CP was added to a pilot-scale UASB effluent and this wastewater was afterwards treated, the degradation rate of 4-CP only decreased by a factor 2. After 2 h of treatment, a full mineralization was obtained in this experiment. The latter observation suggests the suitability of the technique as an effluent polishing step after a biological treatment or as a treatment in recycle over a biological reactor.
authors.affiliation: KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab, J. De Nayerlaan 5, B-2860, Sint-Katelijne-Waver, Belgium.
authors.forename: Jonas
authors.initials: J
authors.lastname: De Coster
authors.affiliation: KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab, J. De Nayerlaan 5, B-2860, Sint-Katelijne-Waver, Belgium.
authors.forename: Wouter
authors.initials: W
authors.lastname: Vanherck
authors.affiliation: KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab, J. De Nayerlaan 5, B-2860, Sint-Katelijne-Waver, Belgium.
authors.forename: Lise
authors.initials: L
authors.lastname: Appels
authors.affiliation: KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab, J. De Nayerlaan 5, B-2860, Sint-Katelijne-Waver, Belgium. Electronic address: raf.dewil@kuleuven.be.
authors.forename: Raf
authors.initials: R
authors.lastname: Dewil
mesh_terms: D002712:Chlorides / Q000737:chemistry; D002733:Chlorophenols / Q000737:chemistry*; D055664:Electrochemical Techniques / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D005947:Glucose / Q000737:chemistry; D007495:Iridium / Q000737:chemistry; D010084:Oxidation-Reduction; D017975:Ruthenium Compounds / Q000737:chemistry; D014025:Titanium / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry
chemical_list: D002712:Chlorides; D002733:Chlorophenols; D005947:Glucose; D007495:Iridium; D017975:Ruthenium Compounds; D014025:Titanium; D062065:Wastewater; D014874:Water Pollutants, Chemical; C044458:iridium oxide; C029017:ruthenium dioxide; C029107:4-chlorophenol
keywords: 4-chlorophenol; Electrochemical oxidation; Matrix effects; Prediction model; eAOP