A thin layer electrochemical cell for disinfection of water contaminated with Staphylococcus aureus

Brazilian Journal of Microbiology

Isabel C. P. Gusmão¹  Peterson B. Moraes¹  Ederio D. Bidoia¹ 

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

关键词: S. aureus;    disinfection;    treatment of water;    thin layer cell;    S. aureus;    desinfecção;    tratamento de águas;    célula de camada delgada;   

DOI  :  10.1590/S1517-83822009000300029

来源: SciELO

【 摘 要 】

A thin layer electrochemical cell was tested and developed for disinfection treatment of water artificially contaminated with Staphylococcus aureus. Electrolysis was performed with a low-voltage DC power source applying current densities of 75 mA cm-2(3 A) or 25 mA cm-2 (1 A). A dimensionally stable anode (DSA) of titanium coated with an oxide layer of 70%TiO2 plus 30%RuO2 (w/w) and a 3 mm from a stainless-steel 304 cathode was used in the thin layer cell. The experiments were carried out using a bacteria suspension containing 0.08 M sodium sulphate with chloridefree to determine the bacterial inactivation efficacy of the thin layer cell without the generation of chlorine. The chlorine can promote the formation of trihalomethanes (THM) that are carcinogenic. S. aureus inactivation increased with electrolysis time and lower flow rate. The flow rates used were 200 or 500 L h-1. At 500 L h-1 and 75 mA cm -2 the inactivation after 60 min was about three logs of decreasing for colony forming units by mL. However, 100% inactivation for S. aureus was observed at 5.6 V and 75 mA cm-2 after 30 min. Thus, significant disinfection levels can be achieved without adding oxidant substances or generation of chlorine in the water.

【 授权许可】

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