Studies on the electrochemical disinfection of water containing Escherichia coli using a Dimensionally Stable Anode

Brazilian Archives of Biology and Technology

Isabel Celeste Caíres Pereira Gusmão²  Peterson Bueno Moraes¹  Ederio Dino Bidoia² 

[1] ,Universidade Estadual Paulista Instituto de Biociência Departamento de Bioquímica e MicrobiologiaRio Claro SP ,Brasil

关键词: E. coli inactivation;    electrochemical treatment;    electrolysis of microorganisms;    electroxidation process;    bactericidal effect;    DSA oxide electrode;   

DOI  :  10.1590/S1516-89132010000500029

来源: SciELO

【 摘 要 】

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 (10(6) 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-3 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.

【 授权许可】

CC BY-NC   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License