The effect of electrode material on the generation of oxidants and microbial inactivation in the electrochemical disinfection processes

Electrochemical disinfection has gained increasing attention as an alternative for conventional drinking water treatment due to its high effectiveness and environmental compatibility. The most common method of electrochemical disinfection is the use of electro-generated oxidants, such as active chlo...

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Bibliographic Details
Published in:Water research (Oxford) 2009-03, Vol.43 (4), p.895-901
Main Authors: Jeong, Joonseon, Kim, Choonsoo, Yoon, Jeyong
Format: Article
Language:English
Subjects:
Active chlorine
Applied sciences
boron
chlorine
Chlorine - analysis
Diamond
disinfection
Disinfection - methods
drinking water
Electrochemical disinfection
electrochemistry
Electrochemistry - methods
Electrode material
Electrodes
Escherichia coli
Exact sciences and technology
Hydroxyl radical
Hydroxyl Radical - analysis
iridium
microbial contamination
Other industrial wastes. Sewage sludge
oxidants
Oxidants - analysis
para-chlorobenzoic acid
Platinum
Pollution
Reactive oxygen species
Reactive Oxygen Species - analysis
Titanium
Wastes
water treatment
Water treatment and pollution
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Summary:Electrochemical disinfection has gained increasing attention as an alternative for conventional drinking water treatment due to its high effectiveness and environmental compatibility. The most common method of electrochemical disinfection is the use of electro-generated oxidants, such as active chlorine and reactive oxygen species, as disinfectants. This study examined the role of electrode material on the generation of oxidants, and elucidated the different reaction pathways for generating individual oxidants by employing boron-doped diamond (BDD), Ti/RuO 2, Ti/IrO 2, Ti/Pt–IrO 2, and Pt as anode materials. The efficiency of OH production, as determined by para-chlorobenzoic acid ( pCBA) degradation, was in the order of BDD ≫ Ti/RuO 2 ≈ Pt. No significant production of OH was observed at Ti/IrO 2 and Ti/Pt–IrO 2. The OH was found to play a key role in O 3 generation at BDD, but not at the other electrodes. The production of active chlorine was in the order of Ti/IrO 2 > Ti/RuO 2 > Ti/Pt–IrO 2 > BDD > Pt. The large difference in this order from that of ROS was attributed to the difference in the electrocatalytic activity of each electrode material toward the production of active chlorine, as evidenced by linear sweep voltammetry (LSV) measurements. In addition, the characteristics of microbial inactivation as a function of electrode material were examined under the presence of an inert electrolyte, using Escherichia coli as an indicator microorganism.
ISSN:0043-1354
1879-2448
DOI:10.1016/j.watres.2008.11.033