Experimental study and mathematical modeling of the electrochemical degradation of dyeing wastewaters in presence of chloride ion with dimensional stable anodes (DSA) of expanded meshes in a FM01-LC reactor

In the present work an experimental study and mathematical modeling of the indirect electrochemical oxidation of dyeing wastewaters in presence of chloride ion in a FM01-LC reactor in undivided mode coupled to Continuous Stirring Tank (CST) was carried out. As anode five titanium expanded meshes coa...

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Veröffentlicht in:Electrochimica acta 2018-01, Vol.260, p.726-737
Hauptverfasser: Cruz-Díaz, Martín R., Rivero, Eligio P., Rodríguez, Francisca A., Domínguez-Bautista, Rosario
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container_title Electrochimica acta
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creator Cruz-Díaz, Martín R.
Rivero, Eligio P.
Rodríguez, Francisca A.
Domínguez-Bautista, Rosario
description In the present work an experimental study and mathematical modeling of the indirect electrochemical oxidation of dyeing wastewaters in presence of chloride ion in a FM01-LC reactor in undivided mode coupled to Continuous Stirring Tank (CST) was carried out. As anode five titanium expanded meshes coated with IrO2-SnO2 doped with Sb2O5 and five stainless steel expanded meshes as cathode were used. The reactor operated as a batch recirculation system under galvanostatic conditions, the electrolyses were carried out at two current densities, 132 and 200 A m−2, with 1.0 mM of indigo carmine dye and 0.05 M of NaCl; four liquid flow rates: 0.9, 1.8, 2.7, and 3.6 L min−1 were used. The transient mathematical model for FM01-LC reactor takes into account the liquid flow pattern through axial dispersion coefficient (Dax), the electro-oxidation (pseudo first order kinetic) of chloride ions in the anode side (CCl−), the electrochemical reduction of chlorine oxidizing species (Cox) under mass transport control (mass transfer coefficient) in cathode side; while in the CST the chemical oxidation reactions between active chlorine species and organic matter through homogeneous second order kinetics were considered, which were evaluated through consumption of the chemical oxygen demand (CCOD) and the color decay (Ccol). It was observed that the proposed mathematical model describe adequately the experimental evolution of different chemical species (CCl−, CCOD, and Ccol). Also the constant values determined under conditions here worked: kCl−=(3.2·103to4.9·103)s−1; kox=3.5·105to4.6·105s−1;kCOD=1.16·105to4.7·105m3mol−1s−1;kcol=1.2·103to9.98·103m3mol−1s−1; are in good agreement with the values reported in other previous works. •Experimental and modeling of IEO of a dye in presence of chloride in a FM01-LC reactor with DSA anodes of expanded meshes.•The transient mathematical model describe in good agreement the color, COD, and Cl− consumption.•The model predict the chlorine oxidizing agents production to perform the IEO of dyeing wastewaters.•At Reynolds in a low laminar regime the IEO process is improved by direct electrochemical oxidation.
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The transient mathematical model for FM01-LC reactor takes into account the liquid flow pattern through axial dispersion coefficient (Dax), the electro-oxidation (pseudo first order kinetic) of chloride ions in the anode side (CCl−), the electrochemical reduction of chlorine oxidizing species (Cox) under mass transport control (mass transfer coefficient) in cathode side; while in the CST the chemical oxidation reactions between active chlorine species and organic matter through homogeneous second order kinetics were considered, which were evaluated through consumption of the chemical oxygen demand (CCOD) and the color decay (Ccol). It was observed that the proposed mathematical model describe adequately the experimental evolution of different chemical species (CCl−, CCOD, and Ccol). 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Rivero, Eligio P. ; Rodríguez, Francisca A. ; Domínguez-Bautista, Rosario</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c380t-40b77cd771ed9273f82e9c9009d698fde379ed1d3fe17347b4fb5489d3612cc23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Active chlorine</topic><topic>Biological evolution</topic><topic>Cathodes</topic><topic>Chemical oxygen demand</topic><topic>Chemical reactions</topic><topic>Chloride ions</topic><topic>Chlorine</topic><topic>Computational fluid dynamics</topic><topic>Coupled modes</topic><topic>Degradation of dyes</topic><topic>Dimensionally stable anodes</topic><topic>DSA electrodes</topic><topic>Dyeing</topic><topic>Electrochemical oxidation</topic><topic>Electrochemical reactor</topic><topic>Indigo</topic><topic>Kinetics</topic><topic>Liquid flow</topic><topic>Mass transfer</topic><topic>Mathematical analysis</topic><topic>Mathematical models</topic><topic>Oxidation</topic><topic>Parametric global modeling</topic><topic>Reaction kinetics</topic><topic>Studies</topic><topic>Tin dioxide</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Cruz-Díaz, Martín R.</creatorcontrib><creatorcontrib>Rivero, Eligio P.</creatorcontrib><creatorcontrib>Rodríguez, Francisca A.</creatorcontrib><creatorcontrib>Domínguez-Bautista, Rosario</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Electrochimica acta</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Cruz-Díaz, Martín R.</au><au>Rivero, Eligio P.</au><au>Rodríguez, Francisca A.</au><au>Domínguez-Bautista, Rosario</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Experimental study and mathematical modeling of the electrochemical degradation of dyeing wastewaters in presence of chloride ion with dimensional stable anodes (DSA) of expanded meshes in a FM01-LC reactor</atitle><jtitle>Electrochimica acta</jtitle><date>2018-01-10</date><risdate>2018</risdate><volume>260</volume><spage>726</spage><epage>737</epage><pages>726-737</pages><issn>0013-4686</issn><eissn>1873-3859</eissn><abstract>In the present work an experimental study and mathematical modeling of the indirect electrochemical oxidation of dyeing wastewaters in presence of chloride ion in a FM01-LC reactor in undivided mode coupled to Continuous Stirring Tank (CST) was carried out. As anode five titanium expanded meshes coated with IrO2-SnO2 doped with Sb2O5 and five stainless steel expanded meshes as cathode were used. The reactor operated as a batch recirculation system under galvanostatic conditions, the electrolyses were carried out at two current densities, 132 and 200 A m−2, with 1.0 mM of indigo carmine dye and 0.05 M of NaCl; four liquid flow rates: 0.9, 1.8, 2.7, and 3.6 L min−1 were used. The transient mathematical model for FM01-LC reactor takes into account the liquid flow pattern through axial dispersion coefficient (Dax), the electro-oxidation (pseudo first order kinetic) of chloride ions in the anode side (CCl−), the electrochemical reduction of chlorine oxidizing species (Cox) under mass transport control (mass transfer coefficient) in cathode side; while in the CST the chemical oxidation reactions between active chlorine species and organic matter through homogeneous second order kinetics were considered, which were evaluated through consumption of the chemical oxygen demand (CCOD) and the color decay (Ccol). It was observed that the proposed mathematical model describe adequately the experimental evolution of different chemical species (CCl−, CCOD, and Ccol). Also the constant values determined under conditions here worked: kCl−=(3.2·103to4.9·103)s−1; kox=3.5·105to4.6·105s−1;kCOD=1.16·105to4.7·105m3mol−1s−1;kcol=1.2·103to9.98·103m3mol−1s−1; are in good agreement with the values reported in other previous works. •Experimental and modeling of IEO of a dye in presence of chloride in a FM01-LC reactor with DSA anodes of expanded meshes.•The transient mathematical model describe in good agreement the color, COD, and Cl− consumption.•The model predict the chlorine oxidizing agents production to perform the IEO of dyeing wastewaters.•At Reynolds in a low laminar regime the IEO process is improved by direct electrochemical oxidation.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.electacta.2017.12.025</doi><tpages>12</tpages></addata></record>
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subjects Active chlorine
Biological evolution
Cathodes
Chemical oxygen demand
Chemical reactions
Chloride ions
Chlorine
Computational fluid dynamics
Coupled modes
Degradation of dyes
Dimensionally stable anodes
DSA electrodes
Dyeing
Electrochemical oxidation
Electrochemical reactor
Indigo
Kinetics
Liquid flow
Mass transfer
Mathematical analysis
Mathematical models
Oxidation
Parametric global modeling
Reaction kinetics
Studies
Tin dioxide
title Experimental study and mathematical modeling of the electrochemical degradation of dyeing wastewaters in presence of chloride ion with dimensional stable anodes (DSA) of expanded meshes in a FM01-LC reactor
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