The electrochemical elimination of coliforms from water using BBD/Ti or graphite anodes: A comparative study
Fecha
2018-04-01
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International Water Association Publishing
Resumen
The 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.
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Boolean functions, Chlorine compounds, Disinfection, Electrochemical oxidation, Graphite, Optimization, Organic carbon, Statistics, Surface waters, Water treatment, Box-Behnken experimental design, Disinfection efficiency, Electrochemical, Nitrate concentration, Operation parameters, Response surface methodology, Statistical experimental design, Total and fecal coliforms, Anodes, boron doped diamond, diamond, graphite, nitrite, surface water, titanium, unclassified drug, water, comparative study, concentration (composition), diamond, disinfection, electrochemical method, electrode, experimental design, fecal coliform, graphite, methodology, nitrate, nitrite, optimization, oxidation, response surface methodology, total organic carbon, water treatment, Article, bacterial growth, coliform bacterium, comparative study, conductance, current density, disinfection, electrochemistry, experimental design, fecal coliform, oxidation, pathogen clearance, reaction optimization, response surface met