摘要
Bacterial and chemical contaminations of drinking water imperil the health of people.A reactive species injection method is presented for sterilizing drinking water.To produce reactive species,a gas phase surface discharge reactor(SDR)is designed:a spiral stainless steel wire attached on the inside wall of a quartz glass tube is used as the high voltage electrode,and the drinking water is the ground electrode.The performance and mechanisms of the method in inactivating of Escherichia coli(E.coli)are analyzed.Experimental results show that 500 mL E.coli-contaminated drinking water(108CFU/mL)is completely sterilized within 4 min.Based on the scanning electron microscope(SEM)analysis,there were plasma-induced cell structure damages of the E.coli in the sterilized water,and the damage resulted in the leakage of protein,which was proved by chemical analyses.Meanwhile,the heating effect concomitantly generated by discharge plasma does not influence E.coli inactivation,and the contribution of direct ultraviolet(UV)irradiation could be neglected too.The ozone generated by SDR and the hydroxyl radicals(·OH)subsequently generated in drinking water play the decisive roles in E.coli inactivation because these reactive species cause the cell rupture.
Bacterial and chemical contaminations of drinking water imperil the health of people. A reactive species injection method is pre- sented for sterilizing drinking water. To produce reactive species, a gas phase surface discharge reactor （SDR） is designed： a spiral stainless steel wire attached on the inside wall of a quartz glass tube is used as the high voltage electrode, and the drinking water is the ground elec- trode. The performance and mechanisms of the method in inactivating of Escherichia coli （E. coli） are analyzed. Experimental results show that 500 mL E. coli-contaminated drinking water （108 CFU/mL） is completely sterilized within 4 min. Based on the scanning electron mi- croscope （SEM） analysis, there were plasma-induced cell structure damages of the E. coli in the sterilized water, and the damage resulted in the leakage of protein, which was proved by chemical analyses. Meanwhile, the heating effect concomitantly generated by discharge plasma does not influence E. coli inactivation, and the contribution of direct ultraviolet （UV） irradiation could be neglected too. The ozone generat- ed by SDR and the hydroxyl radicals （.OH） subsequently generated in drinking water play the decisive roles in E. coli inactivation because these reactive species cause the cell rupture.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2013年第9期2119-2124,共6页
High Voltage Engineering
基金
Project supported by Ministry of Science and Technology of China （2008AA06Z308）, National Natural Science Foundation of China （40901150）, Joint Fund of the National Natural Science Foundation of China （U0970166）, Doctoral Program Foundation of Institutions of Higher Education of China （20070141004）, Program for Liaoning Excel- lent Talents in University of China （2009R09）, Fundamental Research Fund for the Central Universities （DUT12RC（3）12）.
