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Inactivation Mechanisms of Escherichia Coli in Drinking Water Using Reactive Species Generated from a Surface Discharge

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高电压技术 2013年第9期39卷 2119-2124页

作者： li jie shang kefeng wang tiecheng lu na wang tianwei wu yan Institute of Electrostatics and Special Power Dalian University of Technology Dalian 116024 China

Bacterial and chemical contaminations of drinking water imperil the health of people.A reactive species injection method is presented for sterilizing drinking *** 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 *** performance and mechanisms of the method in inactivating of Escherichia coli(***)are *** results show that 500 mL ***-contaminated drinking water(108CFU/mL)is completely sterilized within 4 *** on the scanning electron microscope(SEM)analysis,there were plasma-induced cell structure damages of the *** in the sterilized water,and the damage resulted in the leakage of protein,which was proved by chemical ***,the heating effect concomitantly generated by discharge plasma does not influence *** inactivation,and the contribution of direct ultraviolet(UV)irradiation could be neglected *** ozone generated by SDR and the hydroxyl radicals(·OH)subsequently generated in drinking water play the decisive roles in *** inactivation because these reactive species cause the cell rupture.

关键词：饮用水消毒大肠杆菌表面放电型活性物种机制灭活放电等离子体扫描电子显微镜

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Inactivation Mechanisms of Escherichia coli in Drinking Water Using Reactive Species Injected from A Surface Discharge Reactor

Inactivation Mechanisms of Escherichia coli in Drinking Wate...

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中国物理学会第十八届全国静电学术会议

作者： li jie shang kefeng wang tiecheng lu na wang tianwei wu yan Institute of Electrostatics and Special Power Dalian University of Technology

Bacterial and chemical contamination of drinking water imperils the health of human beings. A reactive species injection method was presented in this paper for sterilization of drinking water. A gas phase surface discharge reactor（SDR）, in which a spiral stainless steel wire attached on the inside wall of a quartz glass tube was used as high voltage electrode and the drinking water was used as ground electrode, was designed to produce reactive species for inactivation of bacterium in drinking water. The inactivation performance and mechanisms of E. coli were analyzed through examination of the factors influencing E. coli inactivation. The results show that 500 ml E. coli-contaminated drinking water（108 CFU/ml） was completely sterilized within 4 min. SEM analysis indicates that plasma-induced cell structure damages of E. coli resulted in the leakage of protein, and chemical analysis also indicates that the leakage of protein increased with the treatment time of drinking water. Heating effect concomitantly generated in discharge plasma did not exhibit any influence on E. coli inactivation, and the contribution of direct UV irradiation to E. coli inactivation could be neglected too, while ozone generated by SDR and secondary ·OH radicals generated in drinking water played the decisive roles in E. coli inactivation, and the inactivation attributed to the cell rupture and protein leakage which mainly resulted from these reactive species.

关键词： Surface discharge plasma Dielectric barrier discharge Escherichia coli Inactivation mechanisms Drinking water

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