个人信息Personal Information
教授
博士生导师
硕士生导师
性别:男
毕业院校:大连理工大学
学位:博士
所在单位:电气工程学院
学科:环境工程. 电工理论与新技术. 高电压与绝缘技术
办公地点:大连理工大学电气工程学院静电所
Inactivation mechanisms of Escherichia coli in drinking water using reactive species generated from a surface discharge
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论文类型:期刊论文
发表时间:2013-09-01
发表刊物:Gaodianya Jishu/High Voltage Engineering
收录刊物:EI、PKU、ISTIC、Scopus
卷号:39
期号:9
页面范围:2119-2124
ISSN号:10036520
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 (108 CFU/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.