Mineralization of cyanide originating from gold leaching effluent using electro-oxidation: multi-objective optimization and kinetic study

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dc.citation.journalTitleJOURNAL OF APPLIED ELECTROCHEMISTRYeng
dc.contributor.authorDobrosz-Gómez I.
dc.contributor.authorGómez García M.Á.
dc.contributor.authorGaviria G.H.
dc.contributor.authorGilPavas E.
dc.contributor.departmentUniversidad EAFIT. Departamento de Ingeniería de Procesosspa
dc.contributor.researchgroupDesarrollo y Diseño de Procesosspa
dc.date.accessioned2021-04-12T19:06:22Z
dc.date.available2021-04-12T19:06:22Z
dc.date.issued2020-01-01
dc.description.abstractAbstract: This study examines the electro-oxidation (EO) of cyanide originating from an industrial plant´s gold leaching effluent. Experiments were carried out in a laboratory-scale batch cell reactor. Monopolar configuration of electrodes consisting of graphite (anode) and aluminum (cathode) was employed, operating in galvanostatic mode. Response Surface Methodology (RSM), based on a Box–Behnken experimental Design (BBD), was used to optimize the EO operational conditions. Three independent process variables were considered: initial cyanide concentration ([CN-]0 = 1000–2000 mg L-1), current density (J =7–107 mA cm-2), and stirring velocity (? = 250–750 rpm). The cyanide conversion (XCN-), Chemical Oxygen Demand (COD) removal percentage (%RCOD), and specific Energy Consumption per unit mass of removed cyanide (EC) were analyzed as response variables. Multi-objective optimization let to establish the most effective EO conditions ([CN-]0 = 1000 mg L-1, J = 100 mA cm-2 and ? = 750 rpm). The experimental data (XCN-, %RCOD, and EC) were fitted to second-order polynomial models with adjusted correlation coefficients (Radj2) of ca. 98, 99 and 87%, respectively. The kinetic analysis, performed at optimal EO operational conditions, allowed determination of time required to meet Colombian permissible discharge limits. The predictive capacity of kinetic expressions was verified against experimental data obtained for gold leaching effluent. Total cyanide removal and 96% of COD reduction were obtained, requiring EC of 71.33 kWh kg-1 and 180 min. The BOD5 (biological oxygen demand)/COD ratio increased from 4.52 × 10-4 to 0.5573, confirming effluent biodegradability after EO treatment. Graphic Abstract: [Figure not available: see fulltext.]The variation of cyanide (CN-), cyanate (CNO-) and ammonium (NH4 +) ions concentrations vs. time at alkaline conditions. EO operational conditions: [CN-]0 = 1000 mg/L, J = 100 mA/cm2 , ? = 750 rpm, [NaCl] = 0.15 M and pH 11.1. © 2020, Springer Nature B.V.eng
dc.identifierhttps://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=9968
dc.identifier.doi10.1007/s10800-019-01392-1
dc.identifier.issn0021891X
dc.identifier.issn15728838
dc.identifier.otherWOS;000512022500007
dc.identifier.otherSCOPUS;2-s2.0-85077584621
dc.identifier.urihttp://hdl.handle.net/10784/28271
dc.language.isoeng
dc.publisherSPRINGER
dc.relationDOI;10.1007/s10800-019-01392-1
dc.relationWOS;000512022500007
dc.relationSCOPUS;2-s2.0-85077584621
dc.relation.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85077584621&doi=10.1007%2fs10800-019-01392-1&partnerID=40&md5=23d7bbd426026ec6e0c32ae41c72f8f2
dc.rightshttps://v2.sherpa.ac.uk/id/publication/issn/0021-891X
dc.sourceJOURNAL OF APPLIED ELECTROCHEMISTRY
dc.subjectAlkalinityeng
dc.subjectBiochemical oxygen demandeng
dc.subjectBiodegradabilityeng
dc.subjectCyanideseng
dc.subjectEffluent treatmenteng
dc.subjectEffluentseng
dc.subjectElectric dischargeseng
dc.subjectElectrochemical oxidationeng
dc.subjectElectrooxidationeng
dc.subjectEnergy utilizationeng
dc.subjectGraphite electrodeseng
dc.subjectIndustrial plantseng
dc.subjectKinetic theoryeng
dc.subjectKineticseng
dc.subjectLeachingeng
dc.subjectOptimizationeng
dc.subjectOxygeneng
dc.subjectSodium chlorideeng
dc.subjectBiological oxygen demandeng
dc.subjectChemical oxygen demand removalseng
dc.subjectCorrelation coefficienteng
dc.subjectGold leachingeng
dc.subjectKinetic studyeng
dc.subjectResponse surface methodologyeng
dc.subjectSecond-order polynomialeng
dc.subjectSpecific energy consumptioneng
dc.subjectMultiobjective optimizationeng
dc.titleMineralization of cyanide originating from gold leaching effluent using electro-oxidation: multi-objective optimization and kinetic studyeng
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion
dc.typeinfo:eu-repo/semantics/articleeng
dc.typearticleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.typepublishedVersioneng
dc.type.localArtículospa

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