The electrochemical elimination of coliforms from water using BBD/Ti or graphite anodes: A comparative study
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Fecha
2018-04-01
Autores
Gil Pavas, E.
Arbelaez, Paula Eliana
Medina, J.
Dobrosz-Gómez, I.
Angel Gomez-Garcia, Miguel
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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