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6CCVD Research

The electrochemical elimination of coliforms from water using BBD/Ti or graphite anodes - a comparative study

At a Glance

Section titled “At a Glance”
MetadataDetails
Publication Date2017-07-21
JournalWater Science & Technology Water Supply
AuthorsEdison GilPavas, Paula ArbelĂĄez, JosĂ© Medina, Izabela Dobrosz‐GĂłmez, Miguel Ángel GĂłmez GarcĂ­a
InstitutionsUniversidad EAFIT, Universidad Nacional de Colombia
Citations4

Abstract

Section titled “Abstract”

Abstract 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 (σ: 500-900 ÎŒS/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 σ. The following optimal conditions for the elimination of total and fecal coliforms were found: j: 10 mA/cm2, σ: 500 ÎŒS/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.

Tech Support

Section titled “Tech Support”

Original Source

Section titled “Original Source”

References

Section titled “References”
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