Studies on the electrochemical disinfection of water containing escherichia coli using a dimensionally stable anode

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Gusmão, Isabel Celeste Caíres Pereira [UNESP]
Moraes, Peterson Bueno [UNESP]
Bidoia, Ederio Dino [UNESP]

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The aim of this work was to investigate the disinfectant effect of electrolysis on chlorine-free water, artificially contaminated with Escherichia coli (CCT-1457) and to evaluate the bactericidal activity of electrolysis and kinetic behavior of a single-cell reactor, with a DSA (Dimensionally Stable Anode) electrode to develop a scaled-up system. A high-density E. coli suspension (106 CFU mL-1) was electrolyzed in this reactor at 25, 50 and 75 mA cm-2 for up to 60 min, at flow rates of 200 and 500 L h-1. Bacterial survival fell by 98.9% without addition of chlorinated compounds and a power consumption rate not more than 5.60 kWh m-2 at flow rate of 200 L h-1 and 75 mA cm-2. The process produced a germicidal effect that reached this inactivation rate within a relatively short contact time. Also, a solution of electrolyzed 0.08 M Na2SO4 added to the inoculum showed residual bactericidal effect. The efficiency of disinfection was regulated by both the contact time and current density applied, and a kinetic function for the survival rate was developed for the purpose of scaling up.



Bactericidal effect, DSA oxide electrode, E. coli inactivation, Electrochemical treatment, Electrolysis of microorganisms, Electroxidation process

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Brazilian Archives of Biology and Technology, v. 53, n. 5, p. 1235-1244, 2010.