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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

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.