2021-04-122018-04-0116069749WOS;000428426900006SCOPUS;2-s2.0-85045190103http://hdl.handle.net/10784/28260The elimination of total and fecal coliforms, from raw surface water, was carried out by electrochemical oxidation using either boron doped diamond (BDD/Ti) or graphite (GP) anodes, in a chloride-free medium. The optimal values of the operation parameters, maximizing the coliform elimination percentage, were determined using statistical experimental design. The current density ( j: 2-20 mA/cm2), the conductivity (s: 500-900 µS/cm) and the anode materials (An) were considered as variables to perform the Box-Behnken experimental design together with the response surface methodology analysis for optimization. The statistical analysis indicated that, in the evaluated range, the disinfection efficiency increased with an increase in j and decreased with an increase in s. The following optimal conditions for the elimination of total and fecal coliforms were found: j: 10 mA/cm2, s: 500 µS/cm and BDD/Ti used as anode material. The BDD/Ti electrode let to achieve complete coliform elimination after ca. 20 min of reaction while the GP one needed ca. 27 min. In water treated with both BDD/Ti and GP anode, after 7 days, any coliforms growth was observed. As a result of the oxidation process, the total organic carbon and nitrite concentration decreased while nitrate concentration increased. © IWA Publishing 2018.enghttps://v2.sherpa.ac.uk/id/publication/issn/1606-9749Boolean functionsChlorine compoundsDisinfectionElectrochemical oxidationGraphiteOptimizationOrganic carbonStatisticsSurface watersWater treatmentBox-Behnken experimental designDisinfection efficiencyElectrochemicalNitrate concentrationOperation parametersResponse surface methodologyStatistical experimental designTotal and fecal coliformsAnodesboron doped diamonddiamondgraphitenitritesurface watertitaniumunclassified drugwatercomparative studyconcentration (composition)diamonddisinfectionelectrochemical methodelectrodeexperimental designfecal coliformgraphitemethodologynitratenitriteoptimizationoxidationresponse surface methodologytotal organic carbonwater treatmentArticlebacterial growthcoliform bacteriumcomparative studyconductancecurrent densitydisinfectionelectrochemistryexperimental designfecal coliformoxidationpathogen clearancereaction optimizationresponse surface metinfo:eu-repo/semantics/article2021-04-12Gil Pavas, E.Arbelaez, Paula ElianaMedina, J.Dobrosz-Gómez, I.Angel Gomez-Garcia, Miguel10.2166/ws.2017.147