The role of reactive oxygen species in the electrochemical inactivation of microorganisms

被引:214
作者
Jeong, Joonseon [1 ]
Kim, Jee Yeon [1 ]
Yoon, Jeyong [1 ]
机构
[1] Seoul Natl Univ, Coll Engn, Sch Chem & Biol Engn, Seoul 151742, South Korea
关键词
D O I
10.1021/es0604313
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Electrochemical disinfection has emerged as one of the most promising alternatives to the conventional disinfection of water in many applications. Although the mechanism of electrochemical disinfection has been largely attributed to the action of electro-generated active chlorine, the role of other oxidants, such as the reactive oxygen species (ROS) center dot OH, O-3, H2O2, and center dot O-2(-) remains unclear. In this study, we examined the role of ROS in the electrochemical disinfection using a boron-doped diamond (BDD) electrode in a chloride-free phosphate buffer medium, in order to avoid any confusion caused by the generation of chlorine. To determine which species of ROS plays the major role in the inactivation, the effects of several operating factors, such as the presence of center dot OH scavenger, pH, temperature, and the initial population of microorganisms, were systematically investigated. This study clearly showed that the center dot OH is the major lethal species responsible for the E. coli inactivation in the chloride-free electrochemical disinfection process, and that the E. coli inactivation was highly promoted at a lower temperature, which was ascribed to the enhanced generation of O-3.
引用
收藏
页码:6117 / 6122
页数:6
相关论文
共 28 条
[1]  
[Anonymous], PROCESS BIOCH
[2]  
AYAD NB, 1988, ANAL CHIM ACTA, V204, P349
[3]   DETERMINATION OF OZONE IN WATER BY THE INDIGO METHOD - A SUBMITTED STANDARD METHOD [J].
BADER, H ;
HOIGNE, J .
OZONE-SCIENCE & ENGINEERING, 1982, 4 (04) :169-176
[4]   The formation of chlorine dioxide in the electrochemical treatment of drinking water for disinfection [J].
Bergmann, H ;
Koparal, AS .
ELECTROCHIMICA ACTA, 2005, 50 (25-26) :5218-5228
[5]   Linear correlation between inactivation of E-coli and OH radical concentration in TiO2 photocatalytic disinfection [J].
Cho, M ;
Chung, H ;
Choi, W ;
Yoon, J .
WATER RESEARCH, 2004, 38 (04) :1069-1077
[6]   Inactivation of Escherichia coli by photochemical reaction of ferrioxalate at slightly acidic and near-neutral pHs [J].
Cho, M ;
Lee, Y ;
Chung, H ;
Yoon, J .
APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 2004, 70 (02) :1129-1134
[7]   ELECTROCATALYSIS IN THE ELECTROCHEMICAL CONVERSION/COMBUSTION OF ORGANIC POLLUTANTS FOR WASTE-WATER TREATMENT [J].
COMNINELLIS, C .
ELECTROCHIMICA ACTA, 1994, 39 (11-12) :1857-1862
[8]   Comparative electrochemical inactivation of bacteria and bacteriophage [J].
Drees, KP ;
Abbaszadegan, M ;
Maier, RM .
WATER RESEARCH, 2003, 37 (10) :2291-2300
[9]   Sequential inactivation of Cryptosporidium parvum oocysts with ozone and free chlorine [J].
Driedger, AM ;
Rennecker, JL ;
Mariñas, BJ .
WATER RESEARCH, 2000, 34 (14) :3591-3597
[10]  
Feng QL, 2000, J BIOMED MATER RES, V52, P662, DOI 10.1002/1097-4636(20001215)52:4<662::AID-JBM10>3.0.CO